Hi I'm trying to get an old application (previously running on Websphere 4) running in Websphere Studio Enterprise Developer, with a view to changing it and then getting it running on Websphere 5. I've created a new project, and imported all the appropriate JSPs, Java source etc. Once of the jars it references is the IBM jt400.jar. I've added this to the classpath and the source compiles fine. I'm trying to run it in the Websphere 5 test evironment. The first JSP shows fine, and calls the login servlet fine. However, it then falls over with a ClassDefNotFound error, because it can't find a class that is within jt400.jar I don't understand how it can find it when compiling, but not in the test environment. It looks as if the test environment has a different class path or something? Any help gratefully received. Cheers.