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  • Subinkrishna Gopi 7:24 pm on May 20, 2011 Permalink |
    Tags: , eclipse, editor, ide, intellij idea, , new found love   

    IntelliJ IDEA, Me & the new found love! 

    And I am falling in love with IntelliJ IDEA, finally. I was using Eclipse IDE for the last five years. Eclipse is awesome, period. But everything is too easy with Eclipse. You will get plugins for all possible things to do with it. So, after spending five long years with Eclipse (who is still my best friend) I decided to try something new. I downloaded the community version of IntelliJ IDEA. I am really impressed by the features it offer though it’s a subset of the actual offering! It made me feel like a programmer!

    Picture: My Hello World! program 🙂

    image

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  • Subinkrishna Gopi 11:11 am on October 28, 2010 Permalink |
    Tags: , , eclipse, guide, how-to, , simple, tutorial   

    Today’s read: Get Started Developing for Android with Eclipse 

    This one is pretty good. Perhaps one of the very useful how-tos! I read this article in smashingmagazine.com a few days back. I was thinking of sharing it from that moment. It’s better late than never. The article talks a lot of things. From about installing the Android SDK, configuring it and even about writing a sample application.

    There’s a lot to get excited about in mobile application development today. With increasingly sophisticated hardware, tablet PCs and a variety of software platforms (Symbian OS, iOS, WebOS, Windows Phone 7…), the landscape for mobile developers is full of opportunities — and a little complex as well.

    So much choice can be overwhelming when you just want to get started building mobile applications. Which platform should you choose? What programming language should you learn? What kit do you need for your planned project? In this tutorial, you’ll learn how to start writing applications for Android, the open-source mobile operating system popularized by Google.

    Source: Smashing Magazine

    Read the article | http://developer.android.com

     
  • Subinkrishna Gopi 2:35 pm on June 4, 2009 Permalink |
    Tags: , eclipse, , , , jdk   

    A small JBoss 5.1 issue 

    jbosscorp_logo

    I don’t know whether I should call it an issue. But for me it was an issue. Recently I switched to JBoss 5.1.0 GA. But when I tried to run it, it was throwing the following exception:

    [ClassLoaderManager] Unexpected error during load of:org.jboss.resource.metadata.repository.DefaultJCAMetaDataRepository
    java.lang.UnsupportedClassVersionError: Bad version number in .class file
            at java.lang.ClassLoader.defineClass1(Native Method)
            at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
            at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:63)
            at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:572)
            at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:532)
            at java.security.AccessController.doPrivileged(Native Method)

    You will have this problem if you are working with JDK 1.5.x. You can switch to JDK 1.6.x and you can get it working fine. But my entire work setup required me to run my Eclipse Ganymede on 1.5 but JBoss on 1.6. So I wrote a batch file which look like this:

    @echo off
    echo Overriding the Jboss home and Java home ...
    set JBOSS_HOME=D:\jboss-5.1.0.GA
    set JAVA_HOME=C:\Program Files\Java\jdk1.6.0
    echo Jboss home: %JBOSS_HOME%
    echo Java home: %JAVA_HOME%
    call %JBOSS_HOME%\bin\run.bat -b 192.168.x.y
    

    So I can have my Eclipse running on 1.5 with JBOSS_HOME set to JDK 1.5 and JBoss on 1.6. Hope this will be helpful for you in some way.

     
  • Subinkrishna Gopi 9:25 am on March 6, 2009 Permalink |
    Tags: eclipse, , ,   

    Part 2 – OSGi: Creating a workspace 

    < Part 1 –  OSGi: What, Why & How | OSGi tutorial home

    To implement my OSGi based applications I am using Equinox (Eclipse Foundation). If you are using Eclipse IDE (which is based on OSGi) you don’ t need to download the OSGi core APIs as you can find it in the Eclipse_Home/plugins directory. If you are using Eclipse Ganymede, you will find a JAR org.eclipse.osgi_3.4.0.v20080605-1900.jar or a higher version. That’s all what we want (for now).

    Equinox download: http://download.eclipse.org/eclipse/equinox/.


    Workspace directory structure

    The directory structure should look like this.

    OSGiWorkspace
    |-- configuration
    |  |-- config.ini               - Framework configuration
    |-- org.eclipse.osgi_3.4.2.jar  - Framework
    |-- subin.orgi.simple.jar       - My bundle
    |
    |-- <other bundles, archives>

    The config.ini is the place where we can configure the framework and bundle behavior. We can talk about it later.


    Running the Equinox core

    Copy org.eclipse.osgi JAR in to your workspace directory. You can start the OSGi framework by running the org.eclipse.osgi JAR file. Use the following command:

    your/workspace/dir> java -jar org.eclipse.osgi_3.4.2.jar -console

    This will start an OSGi console for us using which we can start, install, uninstall OSGi bundles.

    osgi console

    In the above screen shot you can see the OSGi console with the list of installed bundles. (I am using Equinox 3.4.2.)


    Configuring the Equinox workspace
    We can configure Equinox in various ways. I think its very early to mention all those things here. If you are really interested in knowing that, check this link.

    Quick start guide: http://www.eclipse.org/equinox/documents/quickstart.php


    Starting Equinox faceless
    When we start Equinox core using the above command, it will launch an OSGi console. There is a way to start Equinox faceless (with out console). Try this command.

    java -jar org.eclipse.osgi_3.4.2.jar -console 8281 -noExit

    This will make Equinox to launch the OSGi console in port 8281 which we can access using Telnet on port 8281. Try this.

    telnet localhost 8281

    osgi console telnet

    Read more on starting Equinox faceless: http://www.eclipsezone.com/eclipse/forums/t93976.rhtml


    References

    http://www.eclipse.org/equinox/documents/quickstart.php
    http://www.eclipsezone.com/

     
  • Subinkrishna Gopi 3:30 pm on March 3, 2009 Permalink |
    Tags: , eclipse, , felix, , knoplerfish,   

    Part 1 – OSGi: What, Why & How 

    What is OSGi?
    OSGi is a Java-based service platform that can be remotely managed. OSGi has been developed by the OSGi Alliance (formerly known as the Open Services Gateway initiative) is an open standards organization founded in March 1999. The OSGi framework defines an application life cycle management model, a service registry, an Execution environment and Modules.

    Read More: http://www.osgi.org/About/WhatIsOSGi
    Download the specification: http://www.osgi.org/Release4/Download

    OSGi Architecture (Source: Wikipedia)

    osgi_framework

    • Bundles
      Bundles are normal jar components with extra manifest headers. The bundles are loosely coupled & highly cohesive.
    • Services
      The services layer connects bundles in a dynamic way by offering a publish-find-bind model for plain old Java objects (POJO).
    • Services Registry
      The API for management services.
    • Life-Cycle
      The API for life cycle management (install, start, stop, update, and uninstall bundles).
    • Modules
      The layer that defines encapsulation and declaration of dependencies (how a bundle can import and export code).
    • Security
      The layer that handles the security aspects by limit bundle functionality to pre-defined capabilities.
    • Execution Environment
      Defines what methods and classes are available in a specific platform.

    Why should we use OSGi?
    OSGi offers extreme modularity for the developer as the developers will be developing the modules as Bundles which can be plugged in to the application anytime from anywhere. This also enables the reusability and maintainability of the modules. We can even remove some of the modules for upgrade/bug fixes with out disturbing other modules.

    Read more: http://www.osgi.org/About/WhyOSGi

    How can we develop OSGi based applications?
    We can develop an OSGi based application using any of the OSGi implementations. Three of the most widely used implementations are, Equinox (Eclipse Foundation), Apache Felix & Knopflerfish.

    References
    http://www.osgi.org
    http://www.osgi.org/Specifications/HomePage
    http://www.eclipse.org/equinox
    http://felix.apache.org
    http://www.knopflerfish.org/
    http://en.wikipedia.org/wiki/OSGi

     
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