Coding, since 1985

What Ubuntu Unity means to Linux community

2012-01-20T17:54:00.000-08:00

Being a long-term Ubuntu Gnome user, I can definitely understand how die hard hackers hate Unity. But on the other hand, Unity makes some Ubuntu users re-think what they take for granted for last 5 - 6 years and re-examine the world around.

Let's check the Linux users that accessed Wikipedia in September and October 2011 to see the huge impact of Unity.

September 2011

October 2011

A controversial product from Apple and Microsoft will hurt their users, while Linux users as a whole will benefit from such a product. And this is the spirit of FOSS.

My 1st Android App - Sudokroll

2011-12-16T00:27:00.000-08:00

I know how to solve Sudoku puzzles but have never solved one by myself. I'm just too lazy to do that.

I developed a Sudoku solver a while ago. It has a command line interface, so just input your puzzle as follows and it'll get solved.
_____8_7_
91___45__
_7_5__8__
_3__86_5_
7_______3
_4_12__8_
__2__7_6_
__34___21
_9_8_____
Pretty cool, huh?

As I always said, Android development is a bonus to Java developers. I ported my Sudoku solver and made it an Android application. It's called Sudokroll. As the name suggests, you touch a cell and scroll on the screen to assign a number for the cell.

For better look and feel, it's for Android 2.3 Gingerbread and above. Have fun.

When not to use Dependency Injection?

2011-12-01T03:09:00.001-08:00

Dependency Inject and Inversion of Control are too popular for people to think when not to use them.

DI / IoC encourages high-level modules define abstract services for low-level modules toimplement. The changes of the implementation in low-level modules won't affect the defined interfaces,so high-level modules can remain stable. Unit tests to high-level modules can be conducted even whenmocked low-level modules are provided.

From this understanding, it’s always a good idea to use DI / IoC between layers in a multi-tiersoftware architecture. On the contrary, whether or not to use DI / IoC within the same tier shouldbe carefully examined. In most cases, factory method or even new statement will do. Here are a couple ofreasons.

1. The components within same tier are usually tightly coupled. Changing one component and relatedcomponents need to change accordingly is sometimes reasonable, if compared to inter-tier cases.

2. Within same tier, large amount of business objects may be created. This is very different from injectinga low-level service provider to high-level module. The performance of reflection in creating large amountof objects in IoC container may hurt the system.

Upgraded to Subversion 1.7

2011-11-09T21:41:00.000-08:00

If I am asked why you don't like SVN, the evil .svn folders is the answer. With the newly introduced Centralized Metadata Storage, there is only one .svn directory for each project, just like the .git folder in Git repository. Is it time to re-love Subversion? Well, yes and no.

In order to support this new feature, you have to install Eclipse Subclipse plugin 1.8.x. But before that, it's better do a

svn cleanup

for all of your working copies. Although I didn't do it and so far so good, don't risk it.

If you followed this tutorial and installed libsvn-java, please uninstall it. Because at the time of writing, the version of libsvn-java in Ubuntu repository is 1.6.12. When you try to access SVN server, you'll get

Incompatible JavaHL library loaded. 1.7.x or later required.

Follow this to install libsvn-java 1.7.0 and upgrade your working copies with

snv upgrade

Now you have a centralized .svn folder. But don't think you can operate directories and files freely from now on. I use Subclipse 1.8.2 on Eclipse 3.7 SR 1 on Ubuntu 11.10 and found if you delete files and folders directly from file system, the deleted files and folders wouldn't show up in Synchronize view. However, if you add new files and folders, or modify files directly in file system, the plugin will get all the changes.

Even if you delete a folder from Eclipse, and copy a folder with same name but with some changed files, you may get

Could not remove /home/jerry/java/workspace/...

It looks like the metadata fails keeping integrity. I suggest you keep all the folder structure and remove all the files in a folder tree in Eclipse, and copy a whole folder tree with files into project later. Although you may still have following errors, after you refresh project, everything should be fine.

Errors occurred while updating the change sets for SVNStatusSubscriber
org.apache.subversion.javahl.ClientException: SQLite error
svn: database table is locked
svn: database table is locked: WORK_QUEUE

Errors have occurred while calculating the synchronization state for SVNStatusSubscriber.
org.apache.subversion.javahl.ClientException: SQLite error
svn: database table is locked
svn: database table is locked: WC_LOCK

org.apache.subversion.javahl.ClientException: SQLite error
svn: database table is locked
svn: database table is locked: NODES

I summarize my suggestions:

always delete files from IDE;
if files changed but folder structure remain the same, don't delete folders from IDE

Funny statements regarding Database and ORM

2011-11-01T03:19:00.000-07:00

Twitter is great to share things that's hard to misunderstand. 140 characters are just inadequate to explain your philosophy of software development, even a series of tweets. Is a meaningful tweet to you also meaningful to your thousands of followers?

I saw a series tweets from Uncle Bob Martin today and found them very confusing to me, and maybe misleading to others.

Databases are details to be hidden. They are not your central abstraction, nor are they the core of your application. Ever.

In any multi-tier software architecture, lower tier provides service to the tier that sits on it. Modern theory tells us, upper tier defines the contract for lower tier to implement, rather than vice versa. Databases, as a repository service, is by no means a central abstraction, or the core of the whole application. Otherwise, my garage is the core of my house because I store everything there.

But, databases provide an abstraction (no central here) to the tier just above the database layer. As long as the JDBC URL (from a Java developer's perspective, luckily Java is not unpopular so far in enterprise software development) is not used outside data access layer, we can say databases are hidden.

Personally, I really don't know how not to make databases hidden, how not to think databases are not central abstraction, or not the core of an application.

relational tables hold data structures, not objects. Objects are bags of behavior. Data structures are bags of data.

I think he wanted to express either relational tables hold data structures, not classes; or relational tables hold structured data, not objects. But anyway. Relational tables don't hold objects / classes is just the reason why we need ORM to map them to objects / classes, and operate hidden data though interfaces.

Any bridge is used to connect two different entities. ORM is the bridge between data and objects, or tables and classes. If the mapped objects don't provide something else convenient to application development, why do we do the mapping? From a bags of data to another bags of data? Yes, we can. But only in mapping to something like C.

The O in ORM is in error. It should be DS for Data Structure. No simple tool can map tables to objects.

Here comes the funniest part. Everyone knows ORM is first introduced in Java. That's easy to understand why ORM has a O in it. Java doesn't have struct keyword, so it's ridiculous to criticize the naming of ORM. Can't we teach Data Structure in Java? The getters and setters in mapped objects are not behavior?

Unless you apply Domain Driven Development, there are no operations other than getters and setters in mapped objects. Even if you apply DDD, the operations in mapped objects are not mapped from table, they come from business rules. For example, what, in a User table, can be mapped to a addUser() behavior in User class? Don't tell me it's mapped from a stored procedure called add_user. We're talking about tables, right? Stored procedures live inside databases, not tables.

If anyone really likes this kind of naming game, here is a free topic for you if you have thousands of followers like this guy. The disk in RAM disk is in error.

Have fun.

Merit Certificate in Science Talent Search 2011

2011-10-19T22:46:00.000-07:00

Not as lucky as in last two years.

It's a great project, got excellent comments from 2 judges, but failed to get another Bursary. If you check out all the Prime Factorization projects on Scratch, you'll find out it's the best so far.

Be your personal best is all we can do.

Requirement for swap space (or virtual memory), not again

2011-09-24T22:54:00.000-07:00

More and more users have more and more memory installed. In order to take advantage of their memory, some users move cache of Firefox or Chrome to memory from their disk, some Linux users move their temp directories to tempfs.

I mentioned MyEclipse needs swap, or virtual memory, during installation. I came across almost the same problem when I installed Oracle Database Express Edition.

This system does not meet the minimum requirements for swap space. Based on the amount of physical memory available on the system, Oracle Database 10g Express Edition requires 1024 MB of swap space. This system has 0 MB of swap space. Configure more swap space on the system and retry the installation.

I don't have swap partition or swap file at that time, but the installer ignored its own warning and installed itself successfully. I thank Oracle.

I repeat my point here, swap is not necessary in Linux desktop. Hope those applications that still require swap or virtual memory consider it. For those still not sure whether you can remove swap, please reduce your swappiness to 0 to see if you can live without swap.

Java development using Ubuntu 11.10 and OpenJDK 7

2011-09-07T00:44:00.000-07:00

I tried Ubuntu 11.10 Oneiric Ocelot Beta 1. LightDM is lighter and beautiful. Maybe I can keep using Ubuntu on my ThinkPad T42, rather than jumping onto Lubuntu.

Due to the retiring of the "Operating System Distributor License for Java (DLJ)", Sun / Oracle JDKs / JREs cannot be installed by enabling Canonical Partners' repository any more. It's a good news to OpenJDK. With more usage of OpenJDK, we can expect higher priority and fewer bugs.

Since Java 7 is out, the first thing I did is installing OpenJDK 7. From Ubuntu Software Centre, you can only install JRE. I miss Synaptic Package Manager.
sudo apt-get install openjdk-7-jdk

Change default JRE of system from OpenJDK 6 to 7.
sudo update-alternatives --config java

I got following error when installing Subclipse plugin to Eclipse.
An internal error occurred during: "Install download0".
Library /usr/lib/i386-linux-gnu/libsoftokn3.so does not exist

Creating a symbolic link sovled it.
cd /usr/lib/i386-linux-gnu/
sudo ln -s nss/libsoftokn3.so libsoftokn3.so

After Subclipse is installed, I had a small problem in starting Eclipse 3.7 Indigo, but it's a common one.

sudo apt-get install libsvn-java
and
-Djava.library.path=/usr/lib/jni
in eclipse.ini solved it.

m2eclipse and Google plugin for Eclipse work out of box. Maven 3.0.3 works fine with OpenJDK 7.

Apache Tomcat 7.0.21 works fine with OpenJDK 1.7.0 but if you haven't created the above symbolic link, you'll get below error when starting Tomcat.
java.security.ProviderException: Library /usr/lib/i386-linux-gnu/libsoftokn3.so does not exist
at sun.security.pkcs11.SunPKCS11.(SunPKCS11.java:292)
at sun.security.pkcs11.SunPKCS11.(SunPKCS11.java:103)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

I also tried to install Gnome Shell.
sudo apt-get purge gnome-shell

Installation finished successfully but later when I specified Gnome to login, I got a dialog box saying
failed to load session "gnome"

There are a couple of solutions to the problem but none works for me, so I installed classic Gnome.
sudo apt-get install gnome-session-fallback

A fantastic experience, I'm looking forward to its release next month.

Return code 400 when creating a new feature type

2011-08-09T22:52:00.000-07:00

I came across a 400 return code when I tried to use REST Configuration API of GeoServer to create a new feature type. The reference doesn't give any explanation to it. From GeoServer's log, I got

ERROR [geoserver.rest] - No such feature type:

ERROR [geoserver.rest] -org.geoserver.rest.RestletException

        at org.geoserver.catalog.rest.FeatureTypeFinder.findTarget(FeatureTypeFinder.java:40)

        at org.restlet.Finder.handle(Finder.java:268)

        at org.geoserver.rest.BeanDelegatingRestlet.handle(BeanDelegatingRestlet.java:37)

        at org.restlet.Filter.doHandle(Filter.java:105)

        at org.restlet.Filter.handle(Filter.java:134)

        at org.restlet.Router.handle(Router.java:444)

        at com.noelios.restlet.ext.servlet.ServletConverter.service(ServletConverter.java:129)

        at org.geoserver.rest.RESTDispatcher.handleRequestInternal(RESTDispatcher.java:77)



INFO [org.geoserver] - Loaded feature type '', enabled



ERROR [geoserver.rest] - Trying to create new feature type inside the store, but no attributes were specified

ERROR [geoserver.rest] -org.geoserver.rest.RestletException

        at org.geoserver.catalog.rest.FeatureTypeResource.buildFeatureType(FeatureTypeResource.java:174)

        at org.geoserver.catalog.rest.FeatureTypeResource.handleObjectPost(FeatureTypeResource.java:124)

        at org.geoserver.rest.ReflectiveResource.handlePost(ReflectiveResource.java:122)

        at org.restlet.Finder.handle(Finder.java:296)

        at org.geoserver.rest.BeanDelegatingRestlet.handle(BeanDelegatingRestlet.java:37)

        at org.restlet.Filter.doHandle(Filter.java:105)

        at org.restlet.Filter.handle(Filter.java:134)

        at org.restlet.Router.handle(Router.java:444)

        at com.noelios.restlet.ext.servlet.ServletConverter.service(ServletConverter.java:129)

        at org.geoserver.rest.RESTDispatcher.handleRequestInternal(RESTDispatcher.java:77)

It shows that I'm trying to publish a feature type that doesn't exist. Problem solved here but I'd like to go the extra mile, check the source of FeatureTypeResource#buildFeatureType.

170  if(fti.getName() == null) {

171     throw new RestletException("Trying to create new feature type inside the store, " +

172              "but no feature type name was specified", Status.CLIENT_ERROR_BAD_REQUEST);

173  } else if(fti.getAttributes() == null || fti.getAttributes() == null) {

174      throw new RestletException("Trying to create new feature type inside the store, " +

175              "but no attributes were specified", Status.CLIENT_ERROR_BAD_REQUEST);

176  }

WTF is line 173 doing?

Version Lock-in

2011-07-20T04:17:00.000-07:00

Free and open source products are very popular in recent years. This helps to avoid vendor lock-in, but I noticed more and more version lock-in in using FOSS. As the name suggests, version lock-in is the state that a product that depends on specific version of a 3rd-party product.

When a project is developed from scratch, all the versions of 3rd-party products must be determined. Nothing wrong here. But if a 3rd-party product used is not its latest version, we have to take it very seriously. Sure you can say that version has everything you need, it also has potential bugs and performance issues you don't want. Imagine using a very old version of Yahoo! Mail web interface now and you'll get the idea.

If a project is forked from another one, re-examine all the versions of 3rd-party products as early as possible, and keep an eye on them until the project is deployed. I don't remember how many times I searched an exception and found it's a bug and fixed in version x.

On the other hand, by always trying to use latest version, you will be able to contribute to the community better. Consider when you share an experience or file a bug, it makes much more sense when they're based on latest version.

Be brave to use latest versions, or be braver to be version locked-in.

Performance of Virtual Machine

2011-06-16T23:43:00.000-07:00

I gave up dual boot when I upgraded to Ubuntu 11.04 and moved Windows into virtual machine. The performance of Windows guest was good, 35 seconds from power on to desktop (very good as my HDD is 5400 rpm), until I began using it seriously.

I've done a benchmark of compiling one of my GWT project in Eclipse four times. I still remember Turbo C can compile 10 lines of code per second, while Turbo Pascal can compile 100 lines per second when I was in university. Compilation is quite suitable for benchmark because it involves both CPU and I/O tasks.

	1st	2nd	3rd	4th
native in Ubuntu	82	81	80	79
in VirtualBox	143	195	196	265
in Vmware Player	112	107	108	108

The Windows I'm using in virtual machines is Windows 7 Professional 32-bit. IDE is Eclipse for Java EE 3.6.2 32-bit for Linux and Windows. Virtual machine software are Oracle VirtualBox 4.0.8 and VMware Player 3.1.4, for Linux of course.

This is by no means a scientific benchmark, but what I got is if you plan to use a Windows guest heavily in a Linux host, VMware Player is the one to go with at the moment.

gvfs-bin is not included in Ubuntu 11.04 by default

2011-06-07T22:51:00.000-07:00

I developed a backup software running on Ubuntu at home. To get maximum transfer performance when copying files to remote machine, I use some VFS system commands like gvfs-rm, gvfs-copy and gvfs-mkdir. It's much faster than operating files and folders in ~/.gvfs, which, in my case, can get only up to 500kB/s.

However the first time I used it after I upgraded to Natty Narwhal was a nightmare, I took for granted that those gvfs commands are ready to use but I was wrong.

 sudo apt-get install gvfs-bin

Murphy's law applies everywhere.

Natty Narwhal installed

2011-04-29T18:24:00.000-07:00

As always, I installed latest Ubuntu 11.04 at the first time. Unity is not that bad but I did experienced a problem that I had to force power off my laptop. Unity 3D doesn't require decent graphic card. Auto-hide launcher and global menu help to save screen real estate, new scroll bar is cool. But to be on safe side, I stick with classic Gnome at the moment.

One interesting issue occurred when I was installing MyEclipse 9.0 on my new system. Since I have 4GB memory I didn't create Swap partition. That's a reasonable choice but I got following prompt

Insufficient Memory

Your system does not have sufficient memory to support MyEclipse. MyEclipse requires 256 MBs physical memory and 64 MBs virtual memory. Your system only has 3913160 MBs of physical memory, and 0 MBs of virtual memory.

I don't know why Eclipse doesn't require virtual memory while MyEclipse does. And why 3913160 MBs (I didn't say I have 4 TB memory, MyEclipse said that) of physical memory is not sufficient.

Anyway, I'm pretty happy with new Ubuntu release but if part of Ubuntu users switch to Fedora 15, which will be released next month, I won't be surprised.

Performance Tuning

2011-04-07T05:48:00.000-07:00

It's a common sense in the industry that performance tuning should be done after feature complete. But very likely there is only a small time frame between feature complete and code freeze, and during this short time period we need to do so many more important things. There is another common sense after product release, if it ain't broken, don't fix it. Performance issues, if any, are far from being broken.

Sounds weird, but such is life. Thanks to modern programming languages, revolutionary methodologies, cutting edge hardware, we are in a time that you don't need to know how many registers are there in a CPU to development software. And more importantly, nobody actually knows what performance can be achieved for a certain system on a specific platform. I have some real life performance tuning examples and the amazing results here.

From 5 Minutes to 90 Seconds

When I worked in a product called Public Content Management 8 years back, there was a home-made caching system in this product. It worked beautifully after system is started but it took 5 minutes for the system to start. It became so frustrating that my manager gave me a week to figure it out if we could do something. By the end of the 4th day, the product was able to start in 1.5 minutes. After this, I began to pay more attention on what can be done to:

finish a time consuming task in (much) less time; and
leave more CPU cycles to customers.

And from that time, I put "Performance Tuning" as a speciality in my profile.

From 7 Seconds to 70 Millisecond

Last year I participated in a system called Marin Safety. From my development environment, the loading of Waterway Management page took 7 seconds. I knew that this was mainly because I was using a remote database instance, which was not the case in a production environment. An amplified performance issue, ignore it or not? Several hours later, I shortened the loading time to 70 ms.

From 26 Seconds to 18 Seconds to 6 Seconds

Last month, I did a module to update the content of a column in a database table. I started with Statement operations, realising that there might be thousands of records to update, I changed to PreparedStatement. It turned out to be 25,000 records and again remote database made it easy to spot the problem. 26 seconds in Statement and 18 seconds in PreparedStatement without batch updates. Changed to batch updates, the operation finished in 6 seconds.

From 13 Seconds to 182 Millisecond

Last week, I needed to parse some returning strings of WMS calls from a GeoServer. I could select format from text/html and text/plain. I should have one more choice, text/xml, according to the protocol. XML format was obviously the choice because it's self-explained and way easy to get parsed, but GeoServer doesn't even support it. HTML format is reasonably my next choice, it's at lease easier to parse than plain text. But for a sample request, it took GeoServer 13 seconds to return an HTML format result while only 182 ms to return a plain text result. I'm sure you know my answer at this point of time. Do the hard work myself and save user 10+ seconds per call.

From the above examples I just want to give you an idea about performance tuning. It can be done and should be done any time, especially when the environment is not ideal. The fact is, ideal environment (usually production environment) can only cover the performance issues, it won't solve them. It's too late to start performance tuning when you start thinking upgrade your sever or losing your impatient customers.

How to add another data source in JPA

2011-03-24T02:18:00.000-07:00

It's quite easy to create a data source using JPA support of Spring framework. It not so difficult to add another data source to your application as well.

In META-INF/persistence.xml, define another persistence unit.

     <persistence-unit name="anotherUnit" transaction-type="RESOURCE_LOCAL">  
         <class>com.youcompany.YourClass</class>  
         <exclude-unlisted-classes>true</exclude-unlisted-classes>  
         <properties>  
             <property name="hibernate.hbm2ddl.auto" value="update" />  
             <!-- validate | update | create | create-drop -->  
         </properties>  
     </persistence-unit>

Note that you should define all the domain classes you will be using in the defined persistence unit in <class> elements.

Define another database context xml file.

 <?xml version="1.0" encoding="UTF-8"?>  
 <beans xmlns="http://www.springframework.org/schema/beans"  
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"  
     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"  
     xmlns:aop="http://www.springframework.org/schema/aop"  
     xsi:schemaLocation="http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">  
     <!-- holding properties for database connectivity / -->  
     <context:property-placeholder location="classpath:config.properties" />  
     <bean id="anotherDataSource" class="org.apache.commons.dbcp.BasicDataSource"  
         destroy-method="close">  
         <property name="driverClassName" value="${db.driver}" />  
         <property name="url" value="${db.url}" />  
         <property name="username" value="${db.user}" />  
         <property name="password" value="${db.pass}" />  
         <property name="validationQuery" value="${dbcp.validationQuery}" />  
         <property name="testWhileIdle" value="${dbcp.testWhileIdle}" />  
         <property name="timeBetweenEvictionRunsMillis" value="${dbcp.timeBetweenEvictionRunsMillis}" />  
         <property name="numTestsPerEvictionRun" value="${dbcp.numTestsPerEvictionRun}" />  
         <property name="minEvictableIdleTimeMillis" value="${dbcp.minEvictableIdleTimeMillis}" />  
     </bean>  
     <bean id="anotherJpaAdapter"  
         class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"  
         p:database="${db.database}" p:showSql="${db.showSql}" />  
     <bean id="anotherEntityManagerFactory"  
         class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"  
         p:dataSource-ref="anotherDataSource" p:jpaVendorAdapter-ref="anotherJpaAdapter">  
         <property name="loadTimeWeaver">  
             <bean  
                 class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />  
         </property>  
         <property name="persistenceUnitName" value="anotherUnit"></property>  
     </bean>  
     <bean id="anotherTxManager" class="org.springframework.orm.jpa.JpaTransactionManager"  
         p:entityManagerFactory-ref="anotherEntityManagerFactory" />  
 </beans>

In the JPA implementation of generic DAO class, annotate the 1st persistence unit in the setter of EntityManager.

     protected EntityManager entityManager;  
     @PersistenceContext(unitName="firstUnit")  
     public void setEntityManager(EntityManager entityManager) {  
         this.entityManager = entityManager;  
     }

Create another generic DAO class for new persistence unit. All the operations to the new domain objects should be accomplished via this new generic DAO.

If you want to access data source directly, use

     @Autowired  
     @Qualifier("anotherDataSource")  
     private DataSource dataSource;

Don't forget to getAutoCommit and keep the status of any connection you get from data source if you need to setAutoCommit yourself, and close the connection in finally statement.

That's it.

new firmware for my media streamer

2011-02-27T21:55:00.000-08:00

I have a Astone AP-110D as media streamer in my house. I bought it 1.5 years ago and upgraded the firmware to v1.75. This is still the latest released version. Everything works fine except USB disk with EXT3 file system is mounted read-only by default. I have to login to the player, umount and mount again to make the disk writeable.

Last weekend, I found that this player can use 3rd party firmwares. Hoping I can get more functions like Youtube or something. I upgraded to firmware v1.9.9 for IBT-500A / ZP-500A and IBT-1073.

Although they are different devices but seem have same firmware. Unfortunately, no new functions found. But the USB disk is now mounted writeable by default.

I'm happy with this unexpected benefit of openness.

Set up a Maven Repository Manager

2010-12-10T05:12:00.000-08:00

My basic requirements are

rich and intuitive user interface
ease of setting network proxy
ease of deploying 3rd party and internal artifacts

I got a chance to try several different products and finally installed one of them. Here are my impressions and the problems I encountered and luckily fixed.

Sonatype Nexus
No one can ignore it. De facto standard and from the company behind Maven. It's not my first time to use the interface, so no surprise and everything works just as expected.

JFog Artifactory
I had to say I love the design, and the auto discovery of ArtifactId, Version and Type during deploying artifacts, although some GroupId are wrongly set to be the same as ArtifactId.

Apache Archiva
It has quite good UI, but needs work on usabilities. If you have several remote repositories and need to apply the same (is there anyone need to set different proxies?) network proxy, it's a joke. Also it lacks some commonly used artifacts, which the other two players have no such problem.

I tried each of them for half day or so and decided to go with Artifactory.

Problem

Downloading: http://localhost:8081/artifactory/repo/org/apache/maven/plugins/maven-compiler-plugin/2.3.2/maven-compiler-plugin-2.3.2.jar

[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-compiler-plugin:2.3.2: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of its dependencies could not be resolved: Could not find artifact org.apache.maven.plugins:maven-compiler-plugin:jar:2.3.2 in artifactory (http://localhost:8081/artifactory/repo)

Solution
Set network proxy.

Problem

[WARNING] While downloading poi:poi:3.1-FINAL

This artifact has been relocated to org.apache.poi:poi:3.1-FINAL.

Solution
It's not repository manager's problem and it's better to follow the new location defined in pom file.

Problem

HTTP ERROR 409

Problem accessing /artifactory/repo/commons-fileupload/commons-fileupload/1.2.2/commons-fileupload-1.2.2.pom. Reason:

Rejected artifact download request: Checksum policy 'GEN_IF_ABSENT' rejected the artifact 'commons-fileupload-1.2.2.pom'. Checksums info: [ChecksumInfo{type=SHA-1, original='ad3fda4adc95eb0d061341228cc94845ddb9a6fe', actual='0ce5d4a03b07c8b00ab60252e5cacdc708a4e6d8'}, ChecksumInfo{type=MD5, original='c938bb047b88d2b85b47da0be9d901ec', actual='b219248b081b6b44abf436f41e16e9e1'}]

Solution
Go to Configure Repositories, in Edit Remote Repository, change Checksum Policy from default "Generate if absent" to "Ignore and generate".

Problem

HTTP ERROR 409

Problem accessing /artifactory/repo/velocity/velocity/1.5/velocity-1.5.pom. Reason:

The target deployment path 'velocity/velocity/1.5/velocity-1.5.pom' does not match the POM's expected path prefix 'org/apache/velocity/velocity/1.5'. Please verify your POM content for correctness and make sure the source path is a valid Maven 2 repository root path.

Solution
This is not repository manager's problem. Change the dependency definition as suggested.

Problem

HTTP ERROR 404

Problem accessing /artifactory/repo/hsqldb/hsqldb/1.8.0.2/hsqldb-1.8.0.2.pom. Reason:

Could not find resource

Solution
None of the default remote repositories has this artifact. Add a remote repository (in this case, http://repository.jboss.org/maven2/) and assign it to remote-repos.

Problem
Error messages in Maven Console in Eclipse

Unable to update index for snapshots|http://localhost:8081/artifactory/plugins-snapshot: Resource nexus-maven-repository-index.properties does not exist

Updating index central|http://localhost:8081/artifactory/plugins-release

Unable to update index for central|http://localhost:8081/artifactory/plugins-release: Resource nexus-maven-repository-index.properties does not exist

Updating index snapshots|http://localhost:8081/artifactory/libs-snapshot

Unable to update index for snapshots|http://localhost:8081/artifactory/libs-snapshot: Resource nexus-maven-repository-index.properties does not exist

Updating index central|http://localhost:8081/artifactory/libs-release

Unable to update index for central|http://localhost:8081/artifactory/libs-release: Resource nexus-maven-repository-index.properties does not exist

Updating index snapshots|http://localhost:8081/artifactory/plugins-snapshot

Solution
Maven Settings Generator generated wrong URLs in settings.xml. Use following URLs instead.

<repositories>
    <repository>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
        <id>central</id>
        <name>libs-releases</name>
        <url>http://localhost:8081/artifactory/libs-release-local</url>
    </repository>
    <repository>
        <snapshots />
        <id>snapshots</id>
        <name>libs-snapshots</name>
        <url>http://localhost:8081/artifactory/libs-snapshot-local</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
        <id>central</id>
        <name>plugins-releases</name>
        <url>http://localhost:8081/artifactory/plugins-release-local</url>
    </pluginRepository>
    <pluginRepository>
        <snapshots />
        <id>snapshots</id>
        <name>plugins-snapshots</name>
        <url>http://localhost:8081/artifactory/plugins-snapshot-local</url>
    </pluginRepository>
</pluginRepositories>

How to migrate an SVN repository

2010-11-28T16:58:00.000-08:00

I had a chance to migrate an SVN repository of more than 10,000 revisions to another machine. Here are the process and the problems I solved.

1. Install a new Subversion server
CollabNet Subversion Edge 1.3 for Windows 64-bit is chosen because it has great web user interface to manage repositories and users.

2. Dump old repository
This should be very easy by using

svnadmin dump path/to/repository > repository.dump

But I got errors like

svnadmin: Filesystem path .../trunk/... is neither a file nor a directory

This is because either the file system or the repository is corrupt. I had to spit the dumping at the failing revision. Any dumpings after the failing point should use --incremental option.

svnadmin dump -r 0:N-1 path/to/repository > 0_N-1.dump
svnadmin dump --incremental -r N+1:M path/to/repository > N+1_M.dump

3. Create new repository
This can be done in 2 ways.

svnadmin create path/to/repository

or
New Repository in Repositories category in Subversion Edge's web UI (http://host:3343/csvn/repo/create).

Note, however, that you have to uncheck "Create standard trunk/branches/tags structure" in Use template option. Otherwise you will get following error when loading the dumped repository.

adding path : branches ...svnadmin: File already exists: filesystem '..\data\repositories\repository\db', transaction '123-4l', path 'branches'

4. Load dumped repository (for me, repositories)
Remember to use --force-uuid when you load the repository, or you may suffer either the above error or difficulties in relocate you old repository to new one.

svnadmin load --force-uuid path/to/repository < repository.dump

If you have failures in dumping like me. You have to replicate what the failing revision is supposed to be doing, and check in the changes to revision N in my example.

Hope it's helpful to Subversion users, but maybe migrate to Git is the way to go.

A bug in GWT Designer

2010-11-10T16:41:00.000-08:00

Two projects in my team encountered the same problem this week. If you have more than one classes (public A and non-public B) in a Java file (A.java, of course) in GWT client side, there will be compilation errors in GWT problems marker category saying

B can not be found in source packages. Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly.

However these errors affect nothing. You can still run as / debug as web application in development mode, or GWT compile the whole project successfully.

I'm using Eclipse Helios 3.6.1 (Service Release 1) in Ubuntu with

Google Plugin for Eclipse
GWT Designer

After investigation, I found it should be a bug of GWT Designer and reported it to GWT team.

If you really mind the "errors" and need to use GWT Designer, I think you know how to deal with it. In case you want to get rid of GWT Designer, go to Help - About Eclipse - Installation Details - Installed Software, and uninstall all the items with Id starting with com.instantiations.

18/11/2010 Update: It's a bug of Enhanced Compilation and got fixed in GWT Designer BETA.

Change the cache location for Chromium

2010-10-22T04:15:00.000-07:00

If you have plenty of memory and want to move some temporary files out of your disk, tmpfs is the answer. Especially when you are using an SSD and don't want to wear it out soon.

I already did so for Firefox and PostgreSQL, and it's time for my Chromium (or Google Chrome) for Ubuntu.

Create a launcher. In the Launcher Properties, keep the Type to be Application, set the Name to "Chromium Web Brower" and Comment to "Access the Internet". Set Command to be "/usr/bin/chromium-browser --disk-cache-dir=/tmp --disk-cache-size=134217728 %U". That's it.

Note that

there are no quotation marks (") for the value of disk-cache-dir
path in disk-cache-dir is relative to your home, if it's not an absolute path
the unit of disk-cache-size is byte

When Evolution meets Microsoft Exchange

2010-10-17T20:33:00.000-07:00

I tried to use Evolution (since it's the default email client in Ubuntu distro) to access Microsoft Exchange Server but failed. In Evolution Account Assistant, after I set Server Type to Microsoft Exchange and provide OWA URL in Receiving Email dialog box, I always got

Could not authenticate to Server.
Make sure the username and password are correct and try again.

Let me know if you have any idea about what's going wrong, but I decided to try something else.

sudo apt-get install evolution-mapi

This will also install libexchangemapi-1.0-0, which evolution-mapi depends on. Choose Exchange MAPI as Server Type and provide Server, Username and Domain name.

Major Bursary in Science Talent Search 2010

2010-10-06T03:27:00.000-07:00

One more computer program and one more major bursary for my son, just like a year ago.

Upgraded to Ubuntu 10.10 Maverick Meerkat

2010-10-04T19:37:00.000-07:00

update-manager --devel-release worked beautifully for me. The only issue I found is linux-image-2.6.32-25-generic is not removed by Update Manager, but it's a piece of cake for any Linux users.

I love the new font and Firefox's theme. Obviously they are designed with wide screen in mind, because I found there is more vertical space remained.

Well done, Canonical.

These user agents have accessed myTunes

2010-09-14T02:02:00.000-07:00

myTunes is my personal project aggregating popular Chinese podcasts I finished in 2006. Its core functions are generating dynamic RSS feeds, such as all the video contents, all the mp3 contents, etc, and providing OPML, which iTunes supports from several years ago. The UI part, which is just an implmentation of myTunes's API (RSS and OPML), is implemented in JSF.

I promised to publish all the user agents that have accessed myTunes and I think it's the right time now.

Thanks Datong for this pretty logo.

To the iPod mini 1st generation my sister bought me
To Java Studio Creator I used to create the web UI
To Bloglines that will officially shut down on October 1, 2010

1:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1a2) Gecko/20060512 BonEcho/2.0a2  
2:  msnbot/1.0 (+http://search.msn.com/msnbot.htm)  
3:  iTunes/6.0.5 (Windows; N)  
4:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)  
5:  Opera/9.00 (Windows NT 5.1; U; en)  
6:  INTERNET-DOWNLOAD  
7:  Opera/9.00 (Windows NT 5.1; U; zh-cn)  
8:  Maxthon  
9:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4  
10:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; (R1 1.3))  
11:  iTunes/6.0.4 (Windows; N)  
12:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; Maxthon; (R1 1.5))  
13:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; (R1 1.5))  
14:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; (R1 1.3); eBook)  
15:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)  
16:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1b1) Gecko/20060707 Firefox/2.0b1  
17:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060620 Firefox/1.5.0.4 Flock/0.7.1  
18:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060709 Minefield/3.0a1  
19:  User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461; .NET CLR 1.1.4322)  
20:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1)  
21:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)  
22:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.4) Gecko/20060608 Ubuntu/dapper-security Firefox/1.5.0.4  
23:  MagpieRSS/0.7 (+http://magpierss.sf.net)  
24:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)  
25:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)  
26:  J. River Internet Reader/2.0 (compatible; Windows-Media-Player/10)  
27:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.2)  
28:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.12) Gecko/20050919 Firefox/1.0.7  
29:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler )  
30:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322)  
31:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; Alexa Toolbar)  
32:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4  
33:  iTunes/6.0.2 (Windows; N)  
34:  Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4  
35:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; {F5AD05F1-C763-DDDE-CDC9-FBC473231D46}; .NET CLR 1.1.4322)  
36:  Mozilla/5.0 (X11; U; Linux i686; ja-JP; rv:1.7.13) Gecko/20060414 CentOS/1.0.8-1.4.1.centos4 Firefox/1.0.8  
37:  Mozilla/5.0 (compatible) GM RSS Panel  
38:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GOSURF - BETA; GOSURF; .NET CLR 1.1.4322)  
39:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MyIE2)  
40:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; POTU(RR:26060619:0); .NET CLR 2.0.50727; InfoPath.2)  
41:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)  
42:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Alexa Toolbar; mxie; SV1; POTU(RR:26060619:0); roguecleaner; .NET CLR 1.1.4322)  
43:  iTunes/6.0.5 (Macintosh; N; PPC)  
44:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; KKman3.0; .NET CLR 1.1.4322)  
45:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705)  
46:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Maxthon)  
47:  iTunes/6.0.1 (Windows; N)  
48:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; FunWebProducts)  
49:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon)  
50:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)  
51:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; zh-cn) AppleWebKit/417.9 (KHTML, like Gecko) Safari/417.9.2  
52:  AppleSyndication/51  
53:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html)  
54:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Maxthon; .NET CLR 1.1.4322)  
55:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Alexa Toolbar)  
56:  Zhuaxia.com 1 Subscribers  
57:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; TencentTraveler )  
58:  Zhuaxia.com 2 Subscribers  
59:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2  
60:  FeedValidator/1.3  
61:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-tw) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3  
62:  AppleSyndication/54  
63:  foobar2000 v0.9.2  
64:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)  
65:  Feedreader 3.05 (Powered by Newsbrain)  
66:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727)  
67:  Mozilla/4.0 (compatible; Google Desktop)  
68:  Java/1.5.0_07  
69:  myTunes/1.0  
70:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Alexa Toolbar)  
71:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.5) Gecko/20060719 Firefox/1.5.0.5  
72:  Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4  
73:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Maxthon)  
74:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; TencentTraveler ; (R1 1.5))  
75:  iPodder/2.2beta1 (Windows) +http://ipodder.sf.net/  
76:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727; .NET CLR 1.1.4322)  
77:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.5) Gecko/20060719 Firefox/1.5.0.5  
78:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.5) Gecko/20060727 Ubuntu/dapper-security Firefox/1.5.0.5  
79:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.5) Gecko/20060731 Ubuntu/dapper-security Firefox/1.5.0.5  
80:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; POTU(1.13); .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
81:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322)  
82:  Mozilla/4.0 (compatible; MSIE 5.0; Windows NT 4.0)  
83:  Mozilla/5.0 (compatible;heritrix-1.8.0 +http://www.business.com)  
84:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6  
85:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; TencentTraveler )  
86:  Opera/9.00 (X11; Linux i686; U; en)  
87:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; InfoPath.1)  
88:  iTunes/6.0 (Windows; N)  
89:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)  
90:  potu 0.7 (+http://www.potu.com/)  
91:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; POTU(1.13); .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
92:  Gigabot/2.0; http://www.gigablast.com/spider.html  
93:  ia_archiver  
94:  Mozilla/5.0 (PC; U; Intel; Windows; en) AppleWebKit/420+ (KHTML, like Gecko)  
95:  Live.Com Feed Manager  
96:  Opera/9.01 (Windows NT 5.1; U; zh-cn)  
97:  iTunes/6.0.3 (Windows; N)  
98:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; POTU(RR:26060619:0); TencentTraveler ; InfoPath.1)  
99:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
100:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
101:  Mozilla/5.0 (compatible; Google Desktop)  
102:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5  
103:  Protopage/3.0 (http://www.protopage.com)  
104:  Pageflakes/1.0 (WinNT 5.1.2600.0; http://www.pageflakes.com; 1 subscribers )  
105:  Netvibes (http://www.netvibes.com/; 1 subscriber)  
106:  Netvibes (http://www.netvibes.com/; 1 subscribers)  
107:  Netvibes (http://www.netvibes.com/; 2 subscribers)  
108:  lanshanbot/1.0  
109:  Mozilla/6.0 (MSIE 6.0; Windows NT 5.1;Foxmail/MILOWU)  
110:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-cn) AppleWebKit/418 (KHTML, like Gecko) Safari/417.9.3  
111:  AppleSyndication/52  
112:  iTunes/6.0.5 (Macintosh; N; Intel)  
113:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
114:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Avant Browser; Avant Browser)  
115:  Mozilla/4.0 (compatible;)  
116:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
117:  gnome-vfs/2.14.2 neon/0.25.4  
118:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6  
119:  msnbot-media/1.0 (+http://search.msn.com/msnbot.htm)  
120:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; MyIE2; .NET CLR 1.1.4322)  
121:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
122:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3  
123:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; TencentTraveler ; .NET CLR 1.0.3705; .NET CLR 1.1.4322)  
124:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ja-jp) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3  
125:  Ensemble/1.0 (http://pyxis-project.net/)  
126:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)  
127:  Exabot/3.0  
128:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MyIE2; Maxthon)  
129:  Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)  
130:  iTunes/7.0 (Macintosh; N; Intel)  
131:  iTunes/7.0 (Macintosh; N; PPC)  
132:  msnbot/0.9 (+http://search.msn.com/msnbot.htm)  
133:  iTunes/7.0 (Windows; N)  
134:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; zh-cn) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3  
135:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.5) Gecko/20060802 Firefox/1.5.0.5 Flock/0.7.4.1  
136:  Mozilla/5.0 (compatible; Yahoo! Slurp China; http://misc.yahoo.com.cn/help.html)  
137:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2)  
138:  MSN Feed Manager  
139:  Live (http://www.live.com/)  
140:  Zhuaxia.com 3 Subscribers  
141:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322; Alexa Toolbar)  
142:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; zh-CN; rv:1.8.1b2) Gecko/20060821 Firefox/2.0b2  
143:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7  
144:  Grazr/Beta1vX0.2  
145:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; 5460)  
146:  Mozilla/4.0 (compatible; Nokia Podcasting; SymbianOS)  
147:  http://Anonymouse.org/ (Unix)  
148:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418 (KHTML, like Gecko) Safari/417.9.2  
149:  Grazr/v1.0  
150:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; zh-CN; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7  
151:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; .NET CLR 1.1.4322)  
152:  Mozilla/5.0 (000000000; 0; 00000 000 00 0; 00000) 00000000000000000 0000000 0000 000000 000000000000  
153:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7  
154:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.7) Gecko/20060921 Ubuntu/dapper-security Firefox/1.5.0.7  
155:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-cn) AppleWebKit/418.8 (KHTML, like Gecko) Safari/419.3  
156:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; zh-cn) AppleWebKit/85.8.5 (KHTML, like Gecko) Safari/85.8.1  
157:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7  
158:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Tablet PC 1.7; .NET CLR 1.0.3705; .NET CLR 1.1.4322)  
159:  FeedBurner/1.0 (http://www.FeedBurner.com)  
160:  iTunes/7.0 (000000000; 0; 00000)  
161:  Opera/9.02 (Windows NT 5.0; U; zh-cn)  
162:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Maxthon; SV1)  
163:  Mozilla/5.0 (compatible; Yahoo! DE Slurp; http://help.yahoo.com/help/us/ysearch/slurp)  
164:  Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)  
165:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MyIE2; TencentTraveler ; .NET CLR 1.1.4322)  
166:  iTunes/7.0.1 (Macintosh; N; Intel)  
167:  Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)  
168:  iTunes/7.0.1 (Windows; N)  
169:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; Maxthon 2.0)  
170:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050920 Firefox/1.0.7  
171:  Opera/9.02 (Macintosh; PPC Mac OS X; U; zh-cn)  
172:  Bloglines/3.1 (http://www.bloglines.com; 1 subscriber)  
173:  iTunes/7.0.1 (Macintosh; N; PPC)  
174:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 1.1.4322)  
175:  iTunes/7.0.1 (000000000; 0; 00000)  
176:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; Alexa Toolbar; mxie; .NET CLR 1.1.4322)  
177:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322)  
178:  Windows-RSS-Platform/1.0 (MSIE 7.0; Windows NT 5.1)  
179:  NutchCVS/0.7.2 (Nutch; http://lucene.apache.org/nutch/bot.html; nutch-agent@lucene.apache.org)  
180:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
181:  OutfoxBot/0.5 (for internet experiments; http://; outfoxbot@gmail.com)  
182:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; zh-cn) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
183:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.1)  
184:  FeedValidator/1.21 +http://feeds.archive.org/validator/  
185:  Frontier/9.0.1 (WinNT)  
186:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-tw) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
187:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ja-jp) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
188:  Mozilla/4.76 [en] (PalmOS; U; WebPro/3.0.1a; palm-MT64)  
189:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1) Gecko/20060918 Firefox/2.0  
190:  Mozilla/4.0 (compatible; MSIE 6.0; Bluecoat DRTR)  
191:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; GOSURF; RogueCleaner; .NET CLR 1.1.4322; Creative ZENcast v1.02.12)  
192:  Creative ZENcast v1.02.12  
193:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; GOSURF; .NET CLR 1.1.4322; InfoPath.1; Creative ZENcast v1.02.12)  
194:  Mozilla/5.0 (Windows; U; Windows NT 5.0; zh-TW; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7  
195:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Poco 0.31; .NET CLR 2.0.50727)  
196:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1b2) Gecko/20060821 Firefox/2.0b2  
197:  Zhuaxia.com 0 Subscribers  
198:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; InfoPath.1; .NET CLR 1.1.4322)  
199:  gnome-vfs/2.16.1 neon/0.25.4  
200:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1) Gecko/20061010 Firefox/2.0  
201:  ZTE-Me/Mobile  
202:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0  
203:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1) Gecko/20060601 Firefox/2.0 (Ubuntu-edgy)  
204:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Poco 0.31; Maxthon)  
205:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; zh-tw) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
206:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.7) Gecko/20060909 (FoxPlus) Firefox/1.5.0.7  
207:  Mozilla/4.0  
208:  Shim-Crawler(Mozilla-compatible; http://www.logos.ic.i.u-tokyo.ac.jp/crawler/; crawl@logos.ic.i.u-tokyo.ac.jp)  
209:  iTunes/7.0.2 (Macintosh; N; PPC)  
210:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727; Alexa Toolbar; .NET CLR 1.0.3705)  
211:  iTunes/7.0.2 (Macintosh; N; Intel)  
212:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; MyIE2; .NET CLR 1.1.4322; .NET CLR 1.0.3705)  
213:  iTunes/7.0.2 (Windows; N)  
214:  Grazr/v1.1  
215:  iTunes/7.0.2 (000000000; 0; 00000)  
216:  XML-FeedPP/0.16 XML-TreePP/0.18 libwww-perl/5.803  
217:  Mozilla/2.0 (compatible; Ask Jeeves/Teoma; +http://about.ask.com/en/docs/about/webmasters.shtml)  
218:  Juice/2.2 (Windows) +http://juicereceiver.sf.net/  
219:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322)  
220:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; zh-CN; rv:1.8.1) Gecko/20061010 Firefox/2.0  
221:  iTunes/6.0.4 (Macintosh; N; Intel)  
222:  Opera/9.02 (Windows NT 5.1; U; zh-cn)  
223:  Ziepod+ 0.99.1 (www.ziepod.com;MediaAggregator&Player; Windows NT 5.1)  
224:  Opera/9.01 (Windows NT 5.1; U; en)  
225:  <a href='http://www.netforex.org'> Forex Trading Network Organization </a> info@netforex.org  
226:  iTunes/5.0.1 (Windows; N)  
227:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; MyIE2; Maxthon)  
228:  Mozilla/4.0 (Mozilla; http://www.mozilla.org/docs/en/bot.html; master@mozilla.com)  
229:  Ziepod 0.99.1 (www.ziepod.com;PodcastReceiver&Player; Windows NT 5.1)  
230:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; (R1 1.5); .NET CLR 1.1.4322)  
231:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.5) Gecko/20060719 (FoxPlus) Firefox/1.5.0.5  
232:  ichiro/2.0 (http://help.goo.ne.jp/door/crawler.html)  
233:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)  
234:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.03)  
235:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.2; MSOffice 12)  
236:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0  
237:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Poco 0.31; .NET CLR 1.1.4322)  
238:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
239:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; Creative ZENcast v1.02.12)  
240:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322)  
241:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.8) Gecko/20061025 Firefox/1.5.0.8  
242:  Quick News by Stand Alone, Inc.  
243:  Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.8.1) Gecko/20060601 Firefox/2.0 (Ubuntu-edgy)  
244:  iPodder-linux/2.1.9 +http://ipodder.sf.net/  
245:  Python-urllib/1.16  
246:  NokiaE61-1/3.0 (2.0618.06.05) SymbianOS/9.1 Series60/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.1  
247:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; MSOffice 12)  
248:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461)  
249:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.8) Gecko/20061025 Firefox/1.5.0.8  
250:  RSSMicro.com RSS/Atom Feed Robot  
251:  Mozilla/4.0(compatible; MSIE 6.0; Windows NT 5.1; SV1)  
252:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-us) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3  
253:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Mister X)  
254:  iTunes/6.0.2 (Macintosh; N; Intel)  
255:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Maxthon; .NET CLR 1.1.4322)  
256:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0  
257:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; InfoPath.1)  
258:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727; InfoPath.1)  
259:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MyIE2; Maxthon; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
260:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; InfoPath.1)  
261:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; ja-JP-mac; rv:1.8.1) Gecko/20061010 Firefox/2.0  
262:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-TW; rv:1.8.0.8) Gecko/20061025 Firefox/1.5.0.8  
263:  sogou spider  
264:  Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.8.0.8) Gecko/20061025 Firefox/1.5.0.8  
265:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1  
266:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20061204 GranParadiso/3.0a1  
267:  iSiloX/4.32 Windows/32  
268:  iTunes/6.0.1 (Macintosh; N; PPC)  
269:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; HbTools 4.7.7)  
270:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.9) Gecko/20061206 Firefox/1.5.0.9  
271:  Mozilla/4.0 (compatible; MSIE 6.0; ; Linux i686) Opera 7.50 [en]  
272:  Opera/9.10 (Windows NT 5.1; U; zh-cn)  
273:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1  
274:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1  
275:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Maxthon 2.0)  
276:  Mozilla/5.0 (000000000; 0; 00000 000 00 0; 00000; 0000000000) 00000000000000 000000000000000  
277:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en)  
278:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.1) Gecko/20060601 Firefox/2.0.0.1 (Ubuntu-edgy)  
279:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Avant Browser)  
280:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Hotbar 4.5.1.0; .NET CLR 1.1.4322)  
281:  Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Nokia E61/0633.09.04; 9730) Opera 8.65 [zh-CN]  
282:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.9) Gecko/20061206 Firefox/1.5.0.9  
283:  Mozilla/4.0 (PSP (PlayStation Portable); 2.00)  
284:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322; InfoPath.1)  
285:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-TW; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1  
286:  Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1  
287:  XML-FeedPP/0.19 XML-TreePP/0.19 libwww-perl/5.76  
288:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; InfoPath.1; .NET CLR 1.1.4322)  
289:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Alexa Toolbar; .NET CLR 2.0.50727; InfoPath.1)  
290:  Mozilla/5.0 (compatible; Exabot/3.0; +http://www.exabot.com/go/robot)  
291:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041215 Firefox/1.0 Red Hat/1.0-12.EL4  
292:  Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)  
293:  Avbrno cuoreyagh tcjrig  
294:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.1.4322)  
295:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts)  
296:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2  
297:  curl/7.13.1 (powerpc-apple-darwin8.0) libcurl/7.13.1 OpenSSL/0.9.7l zlib/1.2.3  
298:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20060601 Firefox/2.0.0.2 (Ubuntu-edgy)  
299:  Grazr/v1.2  
300:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Media Center PC 3.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322)  
301:  iTunes/7.1 (Macintosh; N; Intel)  
302:  iTunes/7.1 (000000000; 0; 00000)  
303:  iTunes/7.1 (Macintosh; N; PPC)  
304:  iTunes/7.1 (Windows; N)  
305:  Mozilla/5.0 (Windows; U; Windows NT 5.0; zh-CN; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2  
306:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-cn) AppleWebKit/418.9.1 (KHTML, like Gecko) Safari/419.3  
307:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2  
308:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; QihooBot 1.0 qihoobot@qihoo.net)  
309:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; TencentTraveler ; .NET CLR 2.0.50727)  
310:  Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2  
311:  Resco News  
312:  Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.3 (like Gecko)  
313:  Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.7.13) Gecko/20050610 K-Meleon/0.9  
314:  Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)  
315:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; TencentTraveler ; .NET CLR 1.1.4322)  
316:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 1 subscribers; feed-id=3254972797126430783)  
317:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 1 subscribers; feed-id=10516567267389403425)  
318:  iTunes/7.1.1 (Macintosh; N; PPC)  
319:  iTunes/7.1.1 (Windows; N)  
320:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; KuGooSoft)  
321:  iTunes/7.1.1 (Macintosh; N; Intel)  
322:  NextGenSearchBot 1 (for information visit http://about.zoominfo.com/About/NextGenSearchBot.aspx)  
323:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)  
324:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418.9.1 (KHTML, like Gecko) Safari/419.3  
325:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Embedded Web Browser from: http://bsalsa.com/; .NET CLR 1.1.4322; .NET CLR 2.0.50727)  
326:  Creative ZENcast v1.04.06  
327:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3  
328:  iTunes/7.1.1 (000000000; 0; 00000)  
329:  ShopWiki/1.0 ( +http://www.shopwiki.com/wiki/Help:Bot)  
330:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3  
331:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)  
332:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11  
333:  Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)  
334:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11  
335:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; NetCaptor 7.5.4)  
336:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.1; .NET CLR 1.1.4322)  
337:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.3) Gecko/20060601 Firefox/2.0.0.3 (Ubuntu-edgy)  
338:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; i-NavFourF; Embedded Web Browser from: http://bsalsa.com/; .NET CLR 1.1.4322)  
339:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; zh-cn) Opera 9.02  
340:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; KuGooSoft)  
341:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.1; Maxthon 2.0)  
342:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; ja-JP-mac; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3  
343:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 1 subscribers; feed-id=18276495934853990384)  
344:  Opera/9.20 (Windows NT 5.1; U; zh-cn)  
345:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0  
346:  Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0  
347:  Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3  
348:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ; .NET CLR 2.0.50727)  
349:  Grazr/v2.0  
350:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11  
351:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.3) Gecko/20061201 Firefox/2.0.0.3 (Ubuntu-feisty)  
352:  gnome-vfs/2.18.1 neon/0.25.4  
353:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; POTU(RR:27011715:0); Maxthon; .NET CLR 2.0.50727)  
354:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; MSOffice 12)  
355:  Ziepod 0.99.9b2 (www.ziepod.com;PodcastReceiver&Player; Windows NT 5.1)  
356:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; Maxthon 2.0)  
357:  iTunes/4.9 (Windows; N)  
358:  Sogou Push Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)  
359:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 1 subscribers; feed-id=15254394928724077235)  
360:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 1 subscribers; feed-id=8177589595128505927)  
361:  Mozilla/4.0 (compatible; MSIE 6.0)  
362:  Mozilla/5.0 (Windows; U; Win98; zh-CN; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3  
363:  iTunes/7.3.1 (Macintosh; N; PPC)  
364:  iTunes/7.3 (Windows; N)  
365:  iTunes/7.3.1 (Windows; N)  
366:  iTunes/7.3.1 (Macintosh; N; Intel)  
367:  iTunes/7.2 (Windows; N)  
368:  iTunes/7.3 (Macintosh; N; Intel)  
369:  iTunes/7.3.1 (000000000; 0; 00000)  
370:  Creative ZENcast v2.00.07  
371:  Opera/9.22 (Windows NT 5.1; U; zh-cn)  
372:  Mozilla/4.0 (compatible; NaverBot/1.0; http://help.naver.com/delete_main.asp)  
373:  Gigabot/3.0 (http://www.gigablast.com/spider.html)  
374:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.5) Gecko/20070713 Firefox/2.0.0.5  
375:  Opera/9.22 (Macintosh; Intel Mac OS X; U; en)  
376:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/419.2.1 (KHTML, like Gecko) Safari/419.3  
377:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6  
378:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.5) Gecko/20061201 Firefox/2.0.0.5 (Ubuntu-feisty)  
379:  Liferea/1.0.52-2 (Linux; en_US; http://liferea.sf.net/)  
380:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Embedded Web Browser from: http://bsalsa.com/; TheWorld)  
381:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6  
382:  iTunes/7.3.2 (Macintosh; N; Intel)  
383:  iTunes/7.3.2 (Macintosh; N; PPC)  
384:  iTunes/7.3.2 (Windows; N)  
385:  iTunes/7.3.2 (000000000; 0; 00000)  
386:  iTunes/7.2 (Macintosh; N; Intel)  
387:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)  
388:  Mozilla/4.0 (compatible; MSIE 6.0; ; Linux armv5tejl; U) Opera 8.02 [en_US] Maemo browser 0.4.34 N770/SU-18  
389:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Media Center PC 3.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; MAXTHON 2.0)  
390:  Mozilla/5.0 (Twiceler-0.9 http://www.cuill.com/twiceler/robot.html)  
391:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727; MSN 6.1; MSNbMSFT; MSNmsc-cn; MSNc0z; v5m)  
392:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; (R1 1.5))  
393:  Opera/9.23 (Windows NT 5.1; U; zh-cn)  
394:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TheWorld)  
395:  Egress  
396:  Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 2 subscribers; feed-id=15254394928724077235)  
397:  iTunes/7.4 (Windows; N)  
398:  iTunes/7.4 (Macintosh; N; Intel)  
399:  Mozilla/5.0 (Windows; U; Windows NT 5.1; zh) AppleWebKit/522.13.1 (KHTML, like Gecko) Version/3.0.2 Safari/522.13.1  
400:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa Toolbar)  
401:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Mozilla/4.0(Compatible Mozilla/4.0(Compatible-EmbeddedWB 14.59 http://bsalsa.com/ EmbeddedWB- 14.59 from: http://bsalsa.com/ ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)  
402:  iTunes/7.4 (Macintosh; N; PPC)  
403:  Sogou web spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)  
404:  iTunes/7.4.1 (Macintosh; N; PPC)  
405:  iTunes/7.4.1 (Macintosh; N; Intel)  
406:  iTunes/7.4.1 (Windows; N)  
407:  iTunes/7.4 (000000000; 0; 00000)  
408:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)  
409:  Mozilla/5.0 (compatible; Exabot Test/3.0; +http://www.exabot.com/go/robot)  
410:  MagpieRSS/0.72 (+http://magpierss.sf.net)  
411:  iTunes/7.4.2 (Windows; N)  
412:  iTunes/7.4.2 (Macintosh; N; Intel)  
413:  Opera/9.23 (Macintosh; Intel Mac OS X; U; zh-cn)  
414:  iTunes/7.4.1 (000000000; 0; 00000)  
415:  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.7) Gecko/20070914 Firefox/2.0.0.7  
416:  iTunes/7.4.2 (Macintosh; N; PPC)  
417:  iTunes/7.4.2 (000000000; 0; 00000)  
418:  Zhuaxia.com 4 Subscribers  
419:  Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.0.12) Gecko/20070531 Firefox/1.5.0.12 Flock/0.7.14  
420:  iTunes/7.3.1 (Windows; N), DynaWeb http://www.dit-inc.us/disclaimer.php  
421:  Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MAXTHON 2.0)  
422:  iTunes/7.4.3 (Windows; N)  
423:  Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.7.12) Gecko/20050921 Red Hat/1.0.7-1.4.1 Firefox/1.0.7  
424:  Mozilla/5.0 (Macintosh; U; Intel Mac OS X; zh-CN; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6  
425:  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20070914 Firefox/2.0.0.6 Flock/0.9.1.0  
426:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 1.1.4322; InfoPath.2)  
427:  Mozilla/5.0 (Windows; U; Windows NT 6.0; ja; rv:1.8.1.8) Gecko/20071008 Firefox/2.0.0.8  
428:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 1.1.4322)

MyEclipse 8.x

2010-09-01T02:55:00.000-07:00

It's so painful to install plug-ins in MyEclipse 8.x. It tries to block you from directly access update URLs with a so-called Software Centre. Things become even worse if you're behind a proxy. What's funnier are You can't update Eclipse 3.5 behind the proxy and MyEclipse still refuses to base itself on Eclipse 3.6.

Anyway, I just want to share a tip in plug-in installing in MyEclipse 8.5. See the screenshot. Note the "Connect directly to host" option.

tmpfs and PostgreSQL

2010-08-25T06:00:00.000-07:00

I've been dreaming to have an SSD for quite a long time. In order to reduce disk operations when I actually have an SSD, I practiced to

point browser.cache.disk.parent_directory of Firefox to /dev/shm
remove swap partition
move several temporary folders to tmpfs.

tmpfs /var/log/apt tmpfs noatime,defaults 0 0
tmpfs /var/log tmpfs noatime,defaults 0 0
tmpfs /tmp tmpfs noatime,defaults 0 0
tmpfs /var/tmp tmpfs noatime,defaults 0 0

It works beautifully until I installed PostgreSQL for a project on my laptop, because it needs one more folder for logs. Here is the workaround.

sudo mkdir /var/log/postgresql
sudo service postgresql-8.4 start

Enjoy taking the advantage of my 4GB memory.

Good practice in using java.util.concurrent

2010-08-11T02:58:00.000-07:00

Concurrent package was introduced from Java 5 and still doesn't get reasonable acceptance. Traditional thread programming is just too strong for us to unlearn it. Several years ago, I created a task framework to solve commonly used scenario, a modified version (most changes are generic related) is used in a product I participated in 2008.

In my current project, I have a requirement of setting timeout for serials of web service operations, which is very suitable for concurrent package. I learned a good lesson from this simple task. I reckon I need to revise my framework one day.

The 1st lesson I learned is it's harder and not safe to set thread name to a Callable thread. One workaround is calling Thread.currentThread().setName() at the beginning of call(). But thread is owned by Callable but by ExecutorService, so this might have some side-effects. Use it at your own risk.

The 2nd one is the overhead of creating and removing threads is much heavier than I imaged before. In debug mode you can see the process of creation and removal of threads, especially when you submit the thread in loops. Try your best to minimize the operations in call() and call call() only in really necessary cases.

Third tip is by using Future.get(1L, TimeUnit.MILLISECONDS) and ignoring TimeoutException you can get an asynchronized thread.

Last but not least is cancel future and shutdown service. If you fail to do this, the callable will be in running status forever and eventually you'll have no memory to create any new thread. Although I don't see any difference between Future.cancel(true) and Future.cancel(false), ExecutorService.shutdown() and ExecutorService.shutdownNow() in my case.

One more bug submitted

2010-07-31T04:32:00.000-07:00

createRecordComponent is not called for the first record created

2010-07-29T23:01:00.000-07:00

I'm using Smart GWT 2.2 and facing a strange bug. The com.smartgwt.client.widgets.grid.ListGrid#createRecordComponent(ListGridRecord record, Integer colNum) is not called for the very first record. Thanks to smartgwt's popularity, I found some complaints and workarounds.

In Issue 450 - smartgwt - createRecordComponent(final ListGridRecord record, Integer colNum) {} never executed, someone suggested create a function that does all the job createRecordComponent is supposed to do and call this function explicitly. If this works, the event model needs also to be hacked, because nothing wrong in createRecordComponent. Hope he/she will contribute the solution to the product.

In createRecordComponent not called for changed record when refreshing ListGrid, another one suggested showRecordComponent must be implemented as well, if not all the columns' component are created in create/updateRecordComponent. Sounds simple but no matter showRecordComponent returns true or false, createRecordComponent still fails to be called.

What helped me is ListGrid.createRecordComponent not called unless a column is sorted. I don't call setSortField because I have no field to sort. I call ListGrid#sort after a new record is added and problem solved.

soapUI 3.5.1 on Ubuntu 10.04

2010-06-21T22:47:00.000-07:00

Update: soapUI 3.6.1 on Ubuntu 10.10 doesn't have the following problem.

I got following error in my console when I tried to run soapUI on Ubuntu. It was started, after a blank splash screen, but cannot create a project.

Exception in thread "XpcMessageLoop" java.lang.NoSuchMethodError: com.jniwrapper.gtk.GTK.initialize([Ljava/lang/String;)V
    at com.teamdev.xpcom.impl.awt.linux.AwtLinuxPlatform.a(SourceFile:166)
    at com.teamdev.xpcom.impl.E.initialize(SourceFile:69)
    at com.teamdev.xpcom.c.run(SourceFile:150)

The solution is to uncomment the following line in soapui.sh

# JAVA_OPTS="$JAVA_OPTS -Dsoapui.jxbrowser.disable=true"

To set authentication information for a web service, use this dialog box.

How to connect an InputStream to an OutputStream

2010-05-22T02:16:00.000-07:00

In the FTP Proxy product, one basic requirement is to intercept upstream authentication commands (USER and PASS commands sent from FTP client to FTP server), finish customized authentication and then let FTP client and FTP server work together with following tasks.

For upstream commands, the proxy has an inputstream from client and an output stream to server; for downstream commands, it has an inputstream from server and an inputstream to client. An easy way to deal with it is StreamConnector.

Don't mix up with similar solutions like Convert a Java OutputStream to an InputStream and Java utilities for stream wiring and file format detection.

Totem Media Player error in Lucid Lynx 32-bit

2010-05-16T00:59:00.000-07:00

Upgraded to Ubuntu 10.04 for a while and everything is fine. But I encountered an error when I tried to play a video today.

An error occurred
pa_stream_writable_size() failed: Connection terminated

I played the same video on Ubuntu 10.04 64-bit without any problem. Time to switch to 64, eh?

Where is Sun Java?

2010-05-07T13:49:00.000-07:00

Trust yourself should be 1st law in open source world.

I installed Ubuntu 10.04 and noticed Sun Java in not in default repository any more. I checked Ubuntu 10.04 LTS Release Notes and found

Sun Java moved to the Partner repository

For Ubuntu 10.04 LTS, the sun-java6 packages have been dropped from the Multiverse section of the Ubuntu archive. It is recommended that you use openjdk-6 instead.
If you can not switch from the proprietary Sun JDK/JRE to OpenJDK, you can install sun-java6 packages from the Canonical Partner Repository. You can configure your system to use this repository via command-line:
add-apt-repository "deb http://archive.canonical.com/ lucid partner"

Easy, but it's wrong. Here is how to enable partner's repository.

You can see the leftover of the wrong command. What a(nother) shame.

Lucid Lynx installed

2010-04-24T18:07:00.000-07:00

6 months ago, I installed Ubuntu 9.10 side by side with Windows XP on a laptop. I let Ubuntu livecd to do all the task, resize XP partition, create Linux root and swap partiton. It worked flawlessly. Each time I start this laptop, I have a chance to choose between Ubuntu and XP, by default Ubuntu.

Last week, Ubuntu 10.04 RC released. It's time to upgrade but the problems are:

Ubuntu 9.10 automatically assigned 6ish GB to Linux partitions (/ and swap). It's not big enough to upgrade directly.
if I remove these 2 partitions, I cannot get my Windows XP started because GRUB will be damaged.

It seems the only way is to accept previous partitions and install new version on them.

When I was just about to start, I got another idea, better and risky. I removed Linux partitions using GParted, resize XP partition to use this newly freed space. Note that I unchecked Round to cylinder, otherwise error occurred. At this time, I could not boot this laptop to Windows XP, grub rescue prompt is shown and I don't know what to do in it.

Then I booted the laptop with livecd and did just the same as I did 6 months ago. I worked and Linux partitions now occupied 12ish GB. I'm happy to work this out and happier to see a more confident Ubuntu.

FTP Dialects

2010-04-12T17:24:00.000-07:00

I'm researching the possibilities of an FTP Proxy that can act as an authentication plugin of an FTP server. As a side product, I experienced totally different FTP dialects from popular FTP clients.

FileZilla 3.3.2.1

(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> Connected, sending welcome message...
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> 220-written by Tim Kosse (Tim.Kosse@gmx.de)
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> USER zhao
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> 331 Password required for zhao
(000001) 13/04/2010 9:54:18 AM - (not logged in) (127.0.0.1)> PASS ********
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 230 Logged on
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> SYST
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 215 UNIX emulated by FileZilla
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> FEAT
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 211-Features:
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> MDTM
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> REST STREAM
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> SIZE
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> MLST type*;size*;modify*;
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> MLSD
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> UTF8
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> CLNT
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> MFMT
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 211 End
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> PWD
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 257 "/" is current directory.
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> TYPE I
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 200 Type set to I
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> PASV
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,4,27)
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> MLSD
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 150 Connection accepted
(000001) 13/04/2010 9:54:18 AM - zhao (127.0.0.1)> 226 Transfer OK

Firefox 3.6.3

(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> Connected, sending welcome message...
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> 220-written by Tim Kosse (Tim.Kosse@gmx.de)
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> USER zhao
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> 331 Password required for zhao
(000002) 13/04/2010 9:59:59 AM - (not logged in) (127.0.0.1)> PASS ********
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 230 Logged on
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> SYST
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 215 UNIX emulated by FileZilla
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> PWD
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 257 "/" is current directory.
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> TYPE I
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 200 Type set to I
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> PASV
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,4,218)
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> SIZE /
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 550 File not found
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> MDTM /
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 550 File not found
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> RETR /
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 550 File not found
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> PASV
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,4,220)
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> CWD /
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 250 CWD successful. "/" is current directory.
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> LIST
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 150 Connection accepted
(000002) 13/04/2010 9:59:59 AM - zhao (127.0.0.1)> 226 Transfer OK

IE 8

(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> Connected, sending welcome message...
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> 220-written by Tim Kosse (Tim.Kosse@gmx.de)
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> USER zhao
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> 331 Password required for zhao
(000003) 13/04/2010 10:01:42 AM - (not logged in) (127.0.0.1)> PASS ********
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 230 Logged on
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> CWD /
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 250 CWD successful. "/" is current directory.
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> TYPE A
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 200 Type set to A
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> PASV
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,4,226)
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> LIST
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 150 Connection accepted
(000003) 13/04/2010 10:01:42 AM - zhao (127.0.0.1)> 226 Transfer OK

It looks that Firefox has the ugliest commands, right?

OpenOffice 3.2.0 released

2010-02-10T17:02:00.000-08:00

If you want to download it via traditional http protocol, please wait for few days more because OpenOffice prefers P2P this time. Go to http://distribution.openoffice.org/p2p/ and you'll find version 3.2.0 for all platforms are already there.

sudo apt-get remove openoffice*.*
sudo dpkg -i OOO320_m12_native_packed-1_en-US.9483/DEBS/*.deb
sudo dpkg -i OOO320_m12_native_packed-1_en-US.9483/DEBS/desktop-integration/openoffice.org3.2-debian-menus_3.2-9472_all.deb

I still remember when Ubuntu released Karmic Koala, I can hardly download torrent file from official website. Hope Canonical will follow this way and give P2P downloader a higher priority.

My digital home

2010-02-05T22:41:00.000-08:00

Connecting people
Sharing information

Submitted another bug to Eclipse

2010-01-28T17:40:00.000-08:00

It's unavoidable to have ambiguous types in single Java file. The way to solve the problem is very easy, using fully qualified class name. Unfortunately, the Content Assist of Eclipse 3.6M4 is not that smart to generate correct code.

I submitted this bug to Eclipse today and let's see what will happen.

Floating point arithmetic in Python 3 is much more accurate

2010-01-15T23:05:00.000-08:00

There is always limited precision in floating point arithmetic due to conversion between decimal and binary. But I found Python 3 becomes much more accurate.

 zhao@nettop:~$ python  
 Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15)   
 [GCC 4.4.1] on linux2  
 Type "help", "copyright", "credits" or "license" for more information.  
 >>> 12.6 / 2  
 6.2999999999999998  
 >>> 12.6 + 0.01
 12.609999999999999
 >>> float('3.2')
 3.2000000000000002

 zhao@nettop:~$ python3  
 Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22)   
 [GCC 4.4.1] on linux2  
 Type "help", "copyright", "credits" or "license" for more information.  
 >>> 12.6 / 2  
 6.3  
 >>> 12.6 + 0.01  
 12.61  
 >>> float('3.2')  
 3.2

Who has any idea about this?

Let scim and ibus support Skype

2010-01-09T02:46:00.000-08:00

By default, I cannot input Chinese in Linux version of Skype. This issue doesn't get solved when Karmic Koala decided to introduce a new input framework, ibus, to replace scim.

To solve this problem, add these 3 lines into your .bashrc file and reboot:

 export GTK_IM_MODULE=ibus  
 export XMODIFIERS=@im=ibus  
 export QT_IM_MODULE=ibus

If you prefer scim, maybe these lines will help (not tested):

 export XMODIFIERS=@im=SCIM  
 export GTK_IM_MODULE=scim  
 export QT_IM_MODULE=scim

Skype is better now under Ubuntu.

Schema of iTunes podcast feed

2010-01-03T17:14:00.000-08:00

In 2006, in order to aggregate my favourite podcasts and share them with other iPod owners, I did a podcast aggregation service named myTunes.

I chose JAXB to map XML documents to Java objects and vice versa, so I need a schema or DTD file of iTunes podcast feed. Unfortunately I couldn't find one. I had to generate one myself.

I got an example feed from Apple. I removed a few elements that I think of no use at the moment and generated its schema.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" elementFormDefault="qualified">
    <xs:complexType name="channelType">
        <xs:sequence>
            <xs:element ref="title"/>
            <xs:element ref="link"/>
            <xs:element ref="language"/>
            <xs:element ref="description"/>
            <xs:element ref="pubDate"/>
            <xs:element name="image" type="imageType"/>
            <xs:element ref="copyright"/>
            <xs:element ref="subtitle"/>
            <xs:element ref="summary"/>
            <xs:element name="item" type="itemType" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="copyright">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
        <xs:element name="subtitle">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
        <xs:element name="summary">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="description">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:complexType name="enclosureType">
        <xs:attribute name="url" use="required">
            <xs:simpleType>
                <xs:restriction base="xs:anyURI">
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="length" use="required">
            <xs:simpleType>
                <xs:restriction base="xs:int">
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="type" use="required">
            <xs:simpleType>
                <xs:restriction base="xs:string">
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
    <xs:element name="guid">
        <xs:simpleType>
            <xs:restriction base="xs:anyURI">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:complexType name="imageType">
        <xs:sequence>
            <xs:element ref="url"/>
            <xs:element ref="title"/>
            <xs:element ref="link"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="itemType">
        <xs:sequence>
            <xs:element ref="title"/>
            <xs:element ref="link"/>
            <xs:element ref="description"/>
            <xs:element ref="subtitle"/>
            <xs:element ref="summary"/>
            <xs:element name="enclosure" type="enclosureType"/>
            <xs:element ref="guid"/>
            <xs:element ref="pubDate"/>
            <xs:element ref="duration"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="language">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="link">
        <xs:simpleType>
            <xs:restriction base="xs:anyURI">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="pubDate">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="duration">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="rss">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="channel" type="channelType"/>
            </xs:sequence>
            <xs:attribute name="version" use="required">
                <xs:simpleType>
                    <xs:restriction base="xs:decimal">
                        <xs:enumeration value="2.0"/>
                    </xs:restriction>
                </xs:simpleType>
            </xs:attribute>
        </xs:complexType>
    </xs:element>
    <xs:element name="title">
        <xs:simpleType>
            <xs:restriction base="xs:string">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
    <xs:element name="url">
        <xs:simpleType>
            <xs:restriction base="xs:anyURI">
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
</xs:schema>

Then I created Java classes (ObjectFactory.java, Rss.java, ChannelType.java, ImageType.java, ItemType.java and EnclosureType.java) using xjc. Now we're ready to output iTunes compatible podcast feed.

I had closed myTunes before I moved to Melbourne in 2008. In less than 2 years, myTunes collected several hundreds of user agent (it only collects user agent, nothing else). I think it'll be a good idea to publish them one day.

Message Digest algorithms in Java Cryptography Architecture

2009-11-16T01:00:00.000-08:00

This is the 2nd part of Message Digest algorithms test. I did performance tests on MD5, SHA-1, SHA-256, SHA-384 and SHA-512 in Java Cryptography Architecture (JCA) of Java SE6 against the same file as in 1st part.

Alg. Name	Real Time	User Time	System Time
MD5	0m15.004s	0m9.109s	0m1.344s
SHA-1	0m38.654s	0m35.318s	0m2.036s
SHA-256	0m59.053s	0m56.032s	0m1.784s
SHA-384	1m56.362s	1m53.663s	0m1.364s
SHA-512	1m58.385s	1m53.727s	0m1.484s

The results are quite interesting if compared with the results of md5sum, sha1sum, sha224sum, sha256sum, sha384sum and sha512sum in Ubuntu in 1st part. Basically

MD5 is comparable in terms of time but with a higher percentage of CPU usage (2X);

SHA-1 and SHA-256 are much slower (2X);

SHA-384 and SHA-512 are a bit faster than native implementations.

VoIP bandwidth usage

2009-11-09T20:08:00.000-08:00

I think in most countries, it's not a problem to worry about the bandwidth usage of VoIP. But it's obviously not the case here in Australia, most Internet users have download limit or even upload limit. That's why "how much bandwidth is used" becomes an FAQ. There are many bandwidth calculators out there, but here is the statistics from my ATA.

Using G729a codec, the throughput is about 3.6MB/hr in one direction.

Using G711u codec, the throughput is about 28.8MB/hr in one direction.

In my calculation, 1MB = 1,000,000Bytes, which is correct to hard disk manufacturers, Snow Leopard and my ISP.

Message Digest algorithms

2009-11-03T04:06:00.000-08:00

I'm doing a home-made backup product that needs to compute checksum of tens of thousands of file. According to Wikipedia, there are quite a number of checksum algorithms.

This product will first base on Linux and some of the checksum utilities are already provided by Ubuntu 9.10. They are md5sum, sha1sum, sha224sum, sha256sum, sha384sum and sha512sum.

In case one day I will port this product to Windows, I also checked MessageDigest of Java Cryptography Architecture (JCA) in Java SE6. It supports MD2, MD5, SHA-1, SHA-256, SHA-384 and SHA-512.

Doing checksum is both CPU and IO intensive. I did a simple performance test today on how much CPU time is needed to compute different checksums (commonly supported by Linux and MessageDigest) of a 723,488,768-byte file.

Alg. Name	Real Time	User Time	System Time
md5sum	0m14.655s	0m4.380s	0m1.300s
sha1sum	0m15.187s	0m12.641s	0m1.764s
sha256sum	0m25.859s	0m23.341s	0m1.656s
sha384sum	2m25.417s	2m23.841s	0m1.432s
sha512sum	2m25.733s	2m23.373s	0m2.116s

Now I have a clear idea of work load of these algorithms. I will do a Java implementation test later to see if I can get similar results.

Empathy and Samba

2009-10-30T17:44:00.000-07:00

I installed Ubuntu 9.10, Karmic Koala, on 2 boxes yesterday. One is on my wife's ThinkPad as dual boot. It occupies 6GB of disk and works as a charm. Another one on my existing Ubuntu 9.04's partition and reuse my /home file system. I had at least two problem when I began to use my new Ubuntu.

The first problem is from Empathy, the substitution Pidgin as an IM client. I got "Network error" when I tried to login my MSN account. I solved this issue by

 killall telepathy-butterfly

but still feel uncomfortable with its user interface. Maybe I should give Emesene a go or stick with Pidgin.

Another problem is I could not mount my NAS using SMB/CIFS. I got a message box says

Unable to mount location
DBus error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)

It turned to be a keyring related defect. My workaround is deleting all the smb entries in Password: default group in Passwords and Encryption Keys.

In my case, it's not a fresh install or an upgrade. Maybe that's the root of the 2 problems I encountered. To be a good trouble shooter, you have to be a good trouble maker.

HTTP Monitor in NetBeans

2009-10-29T15:58:00.000-07:00

By default, the HTTP Monitor function in NetBeans 6.7.1 is disabled. To enable it, go to Properties of GlassFish v2.1.

PS Ubuntu 9.10 is out today. It's so hot that I cannot download its torrent file, don't even think about the iso file. Thanks to zsync, I have ubuntu-9.10-desktop-i386.iso on my disk now.

Invoking JavaFX function from JavaScript

2009-10-28T20:42:00.000-07:00

As we all know, JavaFX script is very friendly to Java. It's also quite friendly to JavaScript because JavaFX can be run as an applet. Here are the steps to call a JavaFX function from JavaScript side. I use NetBeans 6.7.1, JavaFX 1.2, Ubuntu and Firefox as my development environment.

First, create a JavaFX project (Foo) and set the Application Execution Model to Run in Browser. After it can run correctly, copy Foo.jar and Foo_browser.jnlp in dist/ folder. Usually there are four files in the folder, but we only need three. The other one is needed in step 3.

Second, create a web application and put the two files copied in previous step into the root of the web application.

Third, add an id attribute to the following snippet of Foo.html in dist/ folder of previous project. Copy this piece of code and paste it to the web page that uses the JavaFX applet.

 <script src=""http://dl.javafx.com/1.2/dtfx.js""></script>  
 <script>  
       javafx(  
       {  
         archive: "Foo.jar",  
         draggable: true,  
         width: 250,  
         height: 250,  
         code: "foo.Foo",  
         name: "Foo",  
         id: "Applet"  
       }  
     );  
 </script>

Finally, use following code to invoke a JavaFX function

  var app = document.getElementById("Applet");  
  app.script.foo(...);

If you get exception like

message = app.script is undefined

remove the codebase attribute of jnlp element in Foo_browser.jnlp and try again.

Mapped SIP Port & Interdigit Short Timer

2009-10-27T17:07:00.000-07:00

I've had a problem with my VoIP for several days. I could not hear any voice from my DID number from last Friday. I opened a ticket to my service provider and they suggested me to try softphone.

I think that's just a useless step because there is no problem with my sipbroker call. Guess what, after I set Ekiga with my SIP details, I can make correct phone calls with my DID number. So there must be something wrong with my ATA.

I performed a user factory reset (877778) for my SPA-1001 and the problem is gone. I checked the settings and found the Mapped SIP Port of both lines are set to 1024, not 5060. Funny.

Another annoying problem is I usually get a timeout when I dial a number from phone book. I think it should be Interdigit Long Timer, which is set to 10 seconds long but I'm wrong. I changed Interdigit Short Timer from 3 to 5 seconds as I have such a slow handset.

The only shortcoming is waiting for 5 seconds after dialling the last digit. No big deal and this can be avoided by appending a # to every number in my phone book.

Making VoIP work for you is so amazing.

Introduce an old scanner to Ubuntu 9.04

2009-10-26T16:42:00.000-07:00

I bought my scanner several years ago from Zhongguancun. It's an acer s2w 3300u. I love the idea of s2w, scan to web. It's what Google Books is doing. I've been using it to digitalise photos and documents these year, only on Windows.

Since I have a almost Windows-free home now, I planned to try it on Ubuntu. I started Xsane last night, an error occurred

Failed to open device 'snapscan:libusb:003:002': Invalid argument.

This is because the backend of the scanning program, snapscan, doesn't know what kind of scanner it is and which driver to use. Let's try sane-find-scanner and lsusb to figure it out.

 zhao@nettop:~$ sane-find-scanner   
   
  # sane-find-scanner will now attempt to detect your scanner. If the  
  # result is different from what you expected, first make sure your  
  # scanner is powered up and properly connected to your computer.  
   
  # No SCSI scanners found. If you expected something different, make sure that  
  # you have loaded a kernel SCSI driver for your SCSI adapter.  
   
 found USB scanner (vendor=0x04a5 [Color], product=0x20b0 [ FlatbedScanner 22]) at libusb:003:002  
  # Your USB scanner was (probably) detected. It may or may not be supported by  
  # SANE. Try scanimage -L and read the backend's manpage.  
   
  # Not checking for parallel port scanners.  
   
  # Most Scanners connected to the parallel port or other proprietary ports  
  # can't be detected by this program.  
   
  # You may want to run this program as root to find all devices. Once you  
  # found the scanner devices, be sure to adjust access permissions as  
  # necessary.

 zhao@nettop:~$ lsusb   
 Bus 001 Device 004: ID 0bda:0158 Realtek Semiconductor Corp. Mass Stroage Device  
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub  
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub  
 Bus 003 Device 002: ID 04a5:20b0 Acer Peripherals Inc. (now BenQ Corp.) S2W 3300U/4300U  
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub  
 Bus 002 Device 003: ID 0603:00f2 Novatek Microelectronics Corp.   
 Bus 002 Device 002: ID 0d62:a100 Darfon Electronics Corp. Benq Mouse  
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

As you can see the system has this model in its database, what I need to do is to find the driver for it. I cannot find its original CD since I can use it without any special driver or application on Windows. But this is not a big problem for this popular scanner. After a quick search, I got u176v040.bin from a zip file. I copied it to /usr/share/sane/snapscan/ and modified /etc/sane.d/snapscan.conf as follows

 # Change to the fully qualified filename of your firmware file, if  
 # firmware upload is needed by the scanner  
 firmware /usr/share/sane/snapscan/u176v040.bin

All done. Xsane is sort of like GIMP, powerful yet not so friendly. I have to get used to it or find other alternatives, but that's way more simple than driving the scanner up and running.

PS connect the USB cable before power on the scanner.

No more free Ubuntu CD for me

2009-10-18T02:29:00.000-07:00

As a long term Ubuntu user (since 5.04), I know I can request a free Ubuntu CD from Canonical via https://shipit.ubuntu.com/. I got the news yesterday that shipit is open for Karmic Koala. I login and got a disappointing message.

You have already received our maximum number of allowed shipments. Please download the CD image and record it yourself.

I don't know there is a limitation. As a overused Ubuntu user, I was banned to view my request history so I don't know what the limitation is. I requested only ONE CD at a time, but not every release, and I hit the limitation after I've been using Ubuntu for 5 years.

From Koala, I won't be a burden of Canonical. I will download image file and burn CD of every new release of Ubuntu. I will continue to tell every possible Ubuntu user the free request service, because I know, before they hit the limitation, they are very likely already a Ubuntu lover.

Enterprise users are new target of Canonical, personal users shouldn't expect too much from it anymore.

UPDATE: Better late than never, here is the official explanation from Canonical, Keeping Ubuntu CDs available

Major Bursary in Science Talent Search 2009

2009-10-15T03:11:00.000-07:00

Well, not me, it's my son.

Yesterday, he got a mail from Science Victoria, saying he has been awarded a Major Bursary for his entry of a computer program.

My son began "programming" when he was 6.5 years old while I did the same when I was 13. Does this mean that he is twice as smart as me? I think so. Anyway, hope he enjoys it.

My 1st post

2009-10-04T20:45:00.000-07:00

This is my very 1st post here.

I've been a programmer for quite a long time and just realised that I need a place to record what I'm doing right now, basically anything regarding software and programming.

Thanks for watching and hope someone will find this blog useful, and hopefully, interesting.