[jboss-jira] [JBoss JIRA] Created: (EJBTHREE-1029) Invoke remote EJB3 from JVM 1.4 client

[Boris Maras (JIRA)]

Invoke remote EJB3 from JVM 1.4 client
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                 Key: EJBTHREE-1029
                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-1029
             Project: EJB 3.0
          Issue Type: Patch
         Environment: Server : JDK 1.5.0_10, JBoss 4.0.3SP1 + EJB3 jars (RC6), EJB 3 Session Stateless
Client : JDK 1.4.2
            Reporter: Boris Maras


Natively, you cannot use a JVM 1.4 client to call JBoss EJB3. This is because the jboss-ejb3.jar is compiled with JDK 1.5 : using it in a 1.4 JVM gives errors on major/minor version.

So I used jbossretro to convert this jar in jdk 1.4 compatible format.
That gave me a jar that works in my jvm 1.4 client (see attached file, to be used with JBoss 4.0.3SP1 + EJB3 RC6)

In order to use it, you also need to create a client jar for your EJBs, compiled with a 1.4 target. At compile time, you'll probably need to remove some annotations (@Local, @Remote etc). Thus, you need on the client side :
- the client jar for your EJBs
- 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 attach a patch for the current version of ejb3/build.xml, that generates the jboss-ejb3-client14.jar for the current version. I could not test this version, because I only use JBoss 4.0.3SP1, that doesn't support it.

I also attach the jboss-ejb3-client14.jar that works with EJB3 RC6 and JBoss 4.0.3SP1. I generated it with another ant script (also attached), that does this :
- uncompress the file jboss-ejb3.jar
- 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

This ant script should probably let you convert the jar of other versions of JBoss & EJB3.

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