Problems when redeploy EJB's

[josteinf]

Hi !

I need some advice on this (using Jboss302 and embedded Jetty):

1. Deployed a war-file and several jar's containing one stateless sessionBean per jar and a lot of EJB20 entity beans

2. Running my web-application to use a method on one of the sessionsBeans. This works ok.

3. But when I redeploy one of the jars again (nothing is changed) and calling the same method from the web-app it gives me an EJBException (when calling xxSessionHome.create()):

2002-12-17 11:06:37,040 ERROR [org.jboss.ejb.plugins.LogInterceptor] TransactionRolledbackException, causedBy:
javax.ejb.EJBException: Invalid invocation, check your deployment packaging, method=public abstract com.edb.syscon.services.workflow.business.ejb.WorkflowServiceRemote com.edb.syscon.services.workflow.business.ejb.WorkflowServiceHome.create() throws javax.ejb.CreateException,java.rmi.RemoteException
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invokeHome(StatelessSessionContainer.java:597)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome(CachedConnectionInterceptor.java:206)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invokeHome(StatelessSessionInstanceInterceptor.java:57)


Question :

1. Why this error when there is nothing new .....

2. Is it possible to hot-deploy and continue the application eventually with new classes beeing loaded. Or must i always restart ?

[adrian.brock]

The most likely cause is:

Your servlet is holding a reference to the
previous version of the xxSessionHome.

You just redeployed that class. It is changed,
it is reloaded in a new classloader, so it isn't the
same class.

You must cycle the servlet as well.

One common solution to this problem is to put
interfaces in a separate jar so that they do
not get redeployed, just the bean implementations.

Another is ear packaging so the servlet is reloaded
with the ejbs.

Regards,
Adrian