Platform 1: Windows XP, JBoss 4.0.1RC1, JDK 5 Platform 2: Windows XP, JBoss 4.0.5GA, JDK 5 I have a quite stable application based on Struts, Webworks with a few session beans working without any problems on JBoss 4.0.1RC1. I've been working to get the application working in JBoss 4.0.5GA for past couple of days. I want to make the switch to have a production version of JBoss and to make use of the simple way to set up a singleton service as well. I've changed the tomcat web.xml in JBoss 4.0.5 to make use of JDK 5 and that got rid of the "source level must be 5.0" errors. Now the application login screen shows up and I am able to login. But when I click on a link I get the following error: | 15:45:32,327 INFO [STDOUT] 04/04/07 15:45:32 ERROR org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/moms2].[jsp].error - Servlet.service() for servlet jsp threw exception | java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1255) | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1233) | at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:129) | at org.apache.jasper.runtime.PageContextImpl.doSetAttribute(PageContextImpl.java:329) | at org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:308) | at org.apache.jsp.g.include.ListVal_jsp._jspService(ListVal_jsp.java:50) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) | at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) | at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966) | at org.apache.jsp.WorkOrder.WorkOrderDetailNew_jsp._jspService(WorkOrderDetailNew_jsp.java:350) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at webwork.servlets.Dispatcher.service(Dispatcher.java:525) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | 15:45:32,342 INFO [STDOUT] 04/04/07 15:45:32 ERROR org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/moms2].[jsp].error - Servlet.service() for servlet jsp threw exception | java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1255) | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1233) | at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:129) | at org.apache.jasper.runtime.PageContextImpl.doSetAttribute(PageContextImpl.java:329) | at org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:308) | at org.apache.jsp.g.include.ListVal_jsp._jspService(ListVal_jsp.java:50) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) | at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) | at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966) | at org.apache.jsp.WorkOrder.WorkOrderDetailNew_jsp._jspService(WorkOrderDetailNew_jsp.java:350) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at webwork.servlets.Dispatcher.service(Dispatcher.java:525) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | 15:45:32,342 INFO [STDOUT] 04/04/07 15:45:32 ERROR org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/moms2].[Dispatcher].error - Servlet.service() for servlet Dispatcher threw exception | java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1255) | at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1233) | at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:129) | at org.apache.jasper.runtime.PageContextImpl.doSetAttribute(PageContextImpl.java:329) | at org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:308) | at org.apache.jsp.g.include.ListVal_jsp._jspService(ListVal_jsp.java:50) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) | at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) | at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966) | at org.apache.jsp.WorkOrder.WorkOrderDetailNew_jsp._jspService(WorkOrderDetailNew_jsp.java:350) | at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) | at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) | at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) | at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) | at webwork.servlets.Dispatcher.service(Dispatcher.java:525) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | What can I do to fix the problem? 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