Jan's Blog

Jetty and JBoss EJB3

JBoss have come up with an embeddable version of their EJB3 implementation. An alpha release is available for download.

I downloaded it and played around with the embedded example from the tutorial. Here's what I did:

1. once you've downloaded and unzipped the alpha release (I tested with jboss-EJB-3.0_Embeddable_ALPHA_5.zip), go to the docs/embedded-tutorial/embedded-war directory and build it (just type ant).
2. unjar the war file in docs/embedded-tutorial/embedded-war/build/standalone.war to your $jetty.home/webapps directory.
3. move all of the jars in $jetty.home/webapps/standalone/WEB-INF/lib except for tutorial.jar to $jetty.home/lib/ext/jboss (see below for more on this).
4. finally, edit the $jetty.home/webapps/standalone/EmbeddedEJB3.jsp file. The JNDI lookups for the beans in this file don't work and don't match the documentation, so you need to change them. Find the lines:

     
   CustomerDAOLocal local = (CustomerDAOLocal)
                 ctx.lookup(CustomerDAOLocal.class.getName());
   CustomerDAORemote remote = (CustomerDAORemote) 
                 ctx.lookup(CustomerDAORemote.class.getName());
   

   change them to:

   CustomerDAOLocal local = (CustomerDAOLocal) 
                         ctx.lookup("CustomerDAOBean/local");
   CustomerDAORemote remote = (CustomerDAORemote) 
                         ctx.lookup("CustomerDAOBean/remote");
   

5. start jetty: java -jar start.jar and now you can test EJB3s in jetty by surfing to the demo: http://localhost:8080/standalone/EmbeddedEJB3.jsp

I don't think it should be necessary to move the jboss jars out of the webapp, but it makes sense if you want to use EJB3 with more than one webapp.

I haven't as yet been able to make it work with leaving the jars inside the webapp. I get a ClassNotFoundException:

Caused by: org.jboss.util.NestedRuntimeException: 
Cannot load class org.jboss.mx.server.JBossMXServerConfig; 
- nested throwable: (java.lang.ClassNotFoundException: 
org.jboss.mx.server.JBossMXServerConfig)
        at org.jboss.util.Classes.instantiate(Classes.java:514)
        at org.jboss.mx.server.ServerConfig.getInstance(ServerConfig.java:74)
        at javax.management.MBeanServerFactory.(MBeanServerFactory.java:79)

Posted at 06:08AM Dec 05, 2006 by janb in General  |  Comments[3]