Thank you Marina for reply.

I've thougt that the find method returns always an attached entity, but maybe
I'm wrong here. When I'm adding following line in the testcase before the remove
command:

holiday = holidayEJB.getEm().merge(holiday);

then a transaction exception occurs:

javax.persistence.TransactionRequiredException

But: The transactions are container managed, so i do not want to run a manual
transaction.

So, what's wrong? [Message sent by forum member 'pepatpx' (pro...@t-online.de)]

http://forums.java.net/jive/thread.jspa?messageID=386052