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Showing posts from December, 2006

Year 2007: My Self-Study Goals

In the past year of 2006, i underwent 4 Sun certifications (that includes Java SE 5.0 programmer, J2EE 1.4 Webservices developer, J2EE 1.4 Web component developer and J2EE 1.3 Business component developer) and 2 trainings ( Oracle workforce development program's Introduction to Oracle 9i SQL and Program with Oracle 9i PL/SQL). In short, i invested a lot of effort and time in learning of Java EE based enterprise application development, which became the major focus for me last year. I wanted to cover every aspect of web application development in my learning, right from CSS, JavaScript, Ajax, XHTML on client tier to Servlets/JSP/Struts 1.2 on Web tier to EJB 2.x for Business tier and lastly, relational database SQL and PL/SQL on EIS tier. I also covered Webservices (in great details) which has become a very important tool for A2A (ie EAI) and B2B integrations. Learning of Webservices and my score of 88% in SCDJWS 1.4 exam really makes me feel good as i have felt that Webservices wi…

EJB3 development using JBoss 4.0.5.GA

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I encountered an issue today while redeploying EJB 3 jar for hot deployment to JBoss 4.0.5.GA which i installed using the JEMS installer 1.2.0 CR1. The issue and the resolution is mentioned here. You will need to install the JBoss EJB 3 RC 9 Patch 1 to fix it. For EJB3 development with JBoss 4.0.5.GA, you must use the JEMS installer only and not the archive releases.

I continue to see the issue of Wrong target message being thrown and the workaround for now is to restart the JBossAS which fixes the issue. EJB 3 RC 9 patch 1 does not do anything to solve this issue (and i found that one of the issues marked as dependent to this issue has been reopened recently). So expect a fix only by early Jan 07. For now reboot is the best bet.

Also i found that you need to have JSE 5.0only to run your application. Even though the docs say that JDK 1.5+ is supported but you get a strange issue of "Could not dereference object" on deployment of Stateful session beans (see this). So i had to …

Web Beans: JBoss Seam being standardized for Java EE 6 release

Web Beans JSR 299 proposal by JBoss (RedHat Middleware LLC) has been approved unanimously by the JCP executive committee even though IBM and BEA Systems have expressed their concerns regarding it being (too?) ambitious. Following is what they had to say:

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On 2006-06-05 BEA Systems voted Yes with the following comment:
This appears to be a sufficient challenge to achieve, but, in light of the overwhelming support at this stage of the process, we are prepared to see it go ahead.
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On 2006-06-05 IBM voted Yes with the following comment:
Delivering on the deep level of integration that is proposed appears to be an ambitious task.

In short, the goal of this initiative is: to enable EJB 3.0 components to be used as JSF managed beans, unifying the two component models and enabling a considerable simplification to the programming model for web-bas…

Steve jobs @ stanford in 2005

A very motivating speech by Steve Jobs to the Stanford 2005 batch graduates.

Apple WWDC 2006-Windows Vista Copies Mac OS X

Java SE 6 released Dec 11 2006

Some important links i could find to understand what's new about the new Java SE are given below:
Sun's Java SE 6 page
Top ten reasons why you should upgrade to Java SE 6
Java SE 6 impressive performance results
James Gosling on Java SE 6 release

I am going to try it out today :).

Using Subversion for your open source project

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Subversion has been an open source contribution by CollabNet folks which improves over CVS. The Subversion project started in earnest in February 2000, when CollabNet offered Karl Fogel a full time job developing a replacement for CVS. Karl Fogel and Jim Blandy had previously founded Cyclic Software which provides commercial support for CVS. Subversion was designed from the ground up as a modern, high-performance version control system. In contrast to CVS, which had grown organically from shell scripts and RCS, Subversion carries no historical baggage. Subversion takes advantage of a proper database backend (Berkley DB), unlike CVS which is file based. The Subversion team have tried to make the new system similar in feel to CVS, so users are immediately at home with using it. Most of the features of CVS including tagging, branching and merging, are implemented in Subversion, along with host of new features:

versioning support for directories, files and meta-data
history tracking acros…

Starting BaseApp

I have decided to start an open source project - BaseApp. The project is hosted on Google Code site. A new project blog is started where project activity will be logged.

Objective is to come up with a foundation application which can be leveraged to build web applications quickly in J2EE 1.4 (in the likeness of AppFuse). Most of the commonly used feature will be made available (like form based authentication support, netbeans project enabled, custom ant build file created etc). A sample application source will be provided which will use the following frameworks/toolkits as reference implementation:
Oracle 10g XE (the database i will use for testing)JBoss 4.0.4GA (the Application server)Struts 1.2.9 (the web tier framework)Hibernate 2.x (the presentation tier framework)XDoclet 1.2.3 (the attribute oriented programming support library)EJB 2.1
Stateless Session Beans (J2EE 1.4) (synchronous request/response)Message Driven Beans (J2EE 1.4) (asynchronous)JAX-RPC 1.1 (webservice support)JMaki

Choosing your Linux distro

You can find a good comparison between any two Linux distros at http://polishlinux.org/choose/comparison/. For eg, this url compares the Ubuntu with Fedora core.

EasyUbuntu is an easy to use (duh!) script that gives the Ubuntu user the most commonly requested apps, codecs, and tweaks that are not found in the base distribution - all with a few clicks of your mouse.

Java vs .NET

I recently attended a presentation talk by a .NET developer in my team at workplace where he talked about the reasons why he thought M$ .NET is better than Java EE. Following were the points raised by him together with my views on them:
Java is slow in performance (both on server-side and rich client) as compared to .NET.I found this blog post which presents some stats which clearly show that Java (JRE 1.4.2) was more performant than CLR (.NET 1.1). But C# IL when compiled to native code using Ngen.exe did significantly improve performace. Here's another interesting article i could find which compares the Java 5.0 with .NET 2.0 (the two latest releases of the competing platforms as of this writing). The summary from the article is as follows:
Selection Sort algorithm implementation : .NET performs faster by 2:1 as compared to Java.Memory comparison: .NET is using more than twice the amount of memory Java uses to store the same amount of data – 19.9 MB versus a whopping 47.8. Since .…