Have you specified the exact error message? A quick search in glassfish
code base does not come up with any error message string that matches
the pattern specified in your email.
Yes, it was exact, except I abbreviated the full name of the persistence
unit to "xxx".
I know your problem is fixed now, but I would like to know the origin of
this message. Can you please let me know the stack trace for the above
error? It should be in your log file if you still have it.