[jboss-user] [EJB 3.0] - Removing a detached instance

[idefix-free]

Maybe thats a simple thing, but I have the following situation:
JBOSS 4.2
JSF
EJB3


  | public class SpielplatzCrudBean {
  | 	private static SpielplatzDAOLocal dao = (SpielplatzDAOLocal)LookupService.INSTANCE.lookup(SpielplatzDAOLocal.LOCALNAME);
  | 	Spielplatz selectedSpielplatz;
  |         ............
  | 	public String delete()
  | 	{
  | 		String id = FacesContext.getCurrentInstance()
  |         .getExternalContext().getRequestParameterMap()
  |         .get("selectedId");
  | 		selectedSpielplatz = dao.findById(Long.valueOf(id), false);
  | 		dao.merge(selectedSpielplatz);
  | 		dao.makeTransient(selectedSpielplatz);
  | 		selectedSpielplatz=null;
  | 		return "list";
  | 	}
  | }
  | 
when I call the delete method I always get the removie a detached instance exception.
I tried a lot but have no more idea.
Should I add somthing to the persistence.xml or have I to reconfigure my faces?

Please Help.
Chris

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