More details: 1. The jars within the war do not have servlet_api.jar, too.
2. The method session.removeAttribute() works OK in servlets.LoginScreenServlet.processRequest, but in the method called by processRequest it throws the exception. 3. processRequest is in the netbeans webapp, and removeUserId is in a library, included in the war as a jar. 4. It looked as if just calling removeUserId(HttpSession session) from processRequest() caused the error, because println() in the first line of the method did not show in catalina.out. Artur --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]