3 Replies Latest reply on Sep 5, 2007 5:49 AM by bmaras

    Invoke remote EJB3 from JVM 1.4 client

    bmaras Newbie

      I managed to call remote EJB3 from a JVM 1.4 client.
      I would be glad to have some feedback on the way I dit it : is it safe? Should I open a JIRA to publish a patch?

      I use JBoss 4.0.3SP1 with EJB3 RC6. A JDK 1.5 is needed for the EJB3.
      I need to remotely call some of these EJB from a client that runs on JDK 1.4.

      It doesn't work natively, because the jboss-ejb3.jar bundled with EJB3 RC6 is compiled with JDK 1.5. It gives errors on major/minor version.

      So I used JBossRetro (http://labs.jboss.com/jbossretro/) to convert this jar in jdk 1.4 compatible format.
      That gave me a jar that works in my jdk 1.4 client.

      I also needed to create a client jar for my EJBs, compiled with a 1.4 target.
      I had to include the EJB interfaces in it, but they don't compile by default because of the annotations @Local and/or @Remote, so I needed to remove these annotations when I compile the client jar.

      Thus, I can call my EJB 3 Session Stateless Beans. I need on my client :
      - the client jar for my EJBs, compiled as explained above
      - the generated jboss-ejb3-client14.jar
      - jbossretro-rt.jar
      - jboss-backport-concurrent.jar
      - javassist.jar

      I tested that on JBoss 4.0.3SP1+EJB3 RC6, with Session Stateless Beans only.

      I have a patch for the current version of ejb3/build.xml. I could not test the generated jar from this script, because I only use JBoss 4.0.3SP1 that doesn't support the latest version of EJB3 jars.
      I generated my jboss-ejb3-client14.jar with another ant script, that does this :
      - uncompress the file jboss-ejb3.jar bundled with EJB3 RC6
      - delete all files that are not included in jboss-ejb3-client.jar (based on the list of current ejb3/build.xml)
      - run jbossretro on the classes, using the jboss 4.0.3SP1 libraries on the classpath
      - recompress the jar

      Should I create a JIRA for that ?
      I would be glad to have some feedback on all that.