look at the stacktrace.
the NPE is in your code : myprj.j2ee.servlet.filter.ClientSessionIdHandlingFilter.doFilter which is compiled without debugging - so you don't have a line number....
Look at your code before posting here. If you find Jetty behaves in a way that you believe contravenes the spec, or is different from other implementations, then give me a concise description of the difference and I will look into it.
thank you for your reply.
i will look further into the problem, but the problem does not exist in jboss3.0.4 nor jboss3.2.0rc1, which led me to suspect that there might have been a change in the way jetty handles filter processing between the version.
It may well be so - but your first port of call should be the line that the exception is thrown from. If you figure out why you are getting the NPE we will have a much better chance of figuring out what happened.