[jboss-user] [JBoss Seam] - Asynchronous & em problem

[Stateless Bean]

Hi,
I got Application context collection:
	@In(scope=ScopeType.APPLICATION, value="schedulerDates", required=false)
	@Out(scope=ScopeType.APPLICATION, value="schedulerDates", required=false)
	List schedulerDates;

If user do some update to DB, also automatic adds the date of excecute to my app scope collection.
And my problem is with asynhronous em.
I got method in my class who is fired every 5 sek. and i got error with my Entity Manager?

Here is declaration
@In(create=true)
protected EntityManager em;	


and problem.

  | 00:16:24,118 WARN  [Contexts] Could not destroy component: em
  | org.hibernate.TransactionException: Could not register synchronization
  | 

can anyone tell me how to well implement my em in class or what that problem means?

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