Why do I get "erroneous handlers"

Hello!

I have a EJB that throws the following error when we try to connect to a database through RMI.

On the stacktrace my own class is the last one where this seems to be thrown.

The error is the following:
java.lang.InternalError: erroneous handlers.

I do not got any clue why this is happening at all.

So if any one could give me some hints it would be great.

Btw the EJB works fine on other systems. So my guess is that I miss some class or something in this particular system.

But the focus in this question is of course what does :
java.lang.InternalError: erroneous handlers.
...means???

Best regards
Fredrik