MailListener: how to create a new instance for each message?

[amic]

Hi there,

could you please give me a short sample how you instantiate a new entity whenever a message arrives through onMessage(Message message)?.

I'm receiving an exception and I can't figure out how to fix this:

[Component] Exception calling component @Destroy method: entityManager
java.lang.IllegalStateException: attempting to destroy the persistence context while an active transaction exists (try installing <transaction:ejb-transaction/>)
     at org.jboss.seam.persistence.ManagedPersistenceContext.close(ManagedPersistenceContext.java:214)
     at org.jboss.seam.persistence.ManagedPersistenceContext.destroy(ManagedPersistenceContext.java:177)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
     at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144)
     at org.jboss.seam.Component.callComponentMethod(Component.java:2249)
     at org.jboss.seam.Component.callDestroyMethod(Component.java:2180)
     at org.jboss.seam.Component.destroy(Component.java:1469)
     at org.jboss.seam.contexts.Contexts.destroy(Contexts.java:251)
     at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:363)
     at org.jboss.seam.contexts.Lifecycle.endCall(Lifecycle.java:96)
     at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:122)
     at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)

The goal would be, to invoke the process method from the eMailHome bean from inside the onMessage() method.

...
@Name("eMailHome")
public class EMailHome extends EntityHome<EMail> {
...
  public void process() {
  }

It would be great if someone could give me a hint.

Thx
Mike