[adrian.brock]

Do you want to try it with jboss2.4.4_Tomcat4?

If it's a problem with class versions this might fix
it?

It's very bizarre that one moment it's saying the
class isn't serializable and the next that it
doesn't exist :-)

But, without a bit more specification information it
will be impossible to trace this further.
You don't have to post your whole application.
A simple servlet and session bean passing your
classes or similar classes might reproduce the
problem.

I searched the forums for similar errors to yours.
All I found was a serialization error due
to different class versions in the web and j2ee
containers. But as you say, it works from a client.
And a problem due to JUnit configuration.

Regards,
Adrian