Ate, I encountered just the same exception(stacktrace below) when I changed one of jsp(applications/jpetstore/src/webapp/catalog/SearchProducts.jsp), did build by maven, started up tomcat and clicked jpetstore tab.
The change to jsp is quite simple, something like changing table title from "Product ID" to "Product ID2". Could you let me know why this exception occurrs? Is it by the same reason as the case of Carsten? But this case is very very simple, just modify/build/exec of J2-M4 source. Odo [EMAIL PROTECTED] ---------------------------------------------------------------------- Error Define tag cannot set a null value Error Type javax.servlet.jsp.JspException Stacktrace org.apache.struts.taglib.bean.DefineTag.doEndTag(DefineTag.java:238) org.apache.jsp.catalog.Item_jsp._jspService(org.apache.jsp.catalog.Item_jsp:306) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) org.apache.portals.bridges.struts.PortletServletRequestDispatcher.invoke(PortletServletRequestDispatcher.java:128) org.apache.portals.bridges.struts.PortletServletRequestDispatcher.include(PortletServletRequestDispatcher.java:146) org.apache.struts.action.RequestProcessor.doInclude(RequestProcessor.java:1087) org.apache.struts.action.RequestProcessor.internalModuleRelativeInclude(RequestProcessor.java:1025) org.apache.struts.action.RequestProcessor.processInclude(RequestProcessor.java:579) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:215) org.apache.portals.bridges.struts.PortletRequestProcessor.process(PortletRequestProcessor.java:50) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) org.apache.portals.bridges.struts.StrutsPortlet.processRequest(StrutsPortlet.java:335) org.apache.portals.bridges.struts.StrutsPortlet.doView(StrutsPortlet.java:263) javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:247) javax.portlet.GenericPortlet.render(GenericPortlet.java:175) org.apache.jetspeed.factory.JetspeedPortletInstance.render(JetspeedPortletInstance.java:96) org.apache.jetspeed.container.JetspeedContainerServlet.doGet(JetspeedContainerServlet.java:224) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574) org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499) org.apache.jetspeed.container.invoker.ServletPortletInvoker.invoke(ServletPortletInvoker.java:212) org.apache.jetspeed.container.invoker.ServletPortletInvoker.render(ServletPortletInvoker.java:125) sun.reflect.GeneratedMethodAccessor220.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:284) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:163) $Proxy10.render(Unknown Source) org.apache.pluto.PortletContainerImpl.renderPortlet(PortletContainerImpl.java:119) org.apache.jetspeed.container.JetspeedPortletContainerWrapper.renderPortlet(JetspeedPortletContainerWrapper.java:116) org.apache.jetspeed.aggregator.impl.RenderingJob.execute(RenderingJob.java:108) org.apache.jetspeed.aggregator.impl.PortletRendererImpl.renderNow(PortletRendererImpl.java:102) org.apache.jetspeed.aggregator.impl.PageAggregatorImpl.aggregateAndRender(PageAggregatorImpl.java:264) org.apache.jetspeed.aggregator.impl.PageAggregatorImpl.aggregateAndRender(PageAggregatorImpl.java:247) org.apache.jetspeed.aggregator.impl.PageAggregatorImpl.build(PageAggregatorImpl.java:156) org.apache.jetspeed.aggregator.AggregatorValve.invoke(AggregatorValve.java:48) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.pipeline.valve.impl.ActionValveImpl.invoke(ActionValveImpl.java:117) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.container.ContainerValve.invoke(ContainerValve.java:76) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.profiler.impl.ProfilerValveImpl.invoke(ProfilerValveImpl.java:179) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.security.impl.LoginValidationValveImpl.invoke(LoginValidationValveImpl.java:109) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.security.impl.PasswordCredentialValveImpl.invoke(PasswordCredentialValveImpl.java:131) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.localization.impl.LocalizationValveImpl.invoke(LocalizationValveImpl.java:168) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.security.impl.AbstractSecurityValve$1.run(AbstractSecurityValve.java:117) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:454) org.apache.jetspeed.security.impl.AbstractSecurityValve.invoke(AbstractSecurityValve.java:111) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.container.url.impl.PortalURLValveImpl.invoke(PortalURLValveImpl.java:55) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.capabilities.impl.CapabilityValveImpl.invoke(CapabilityValveImpl.java:127) org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:203) org.apache.jetspeed.pipeline.JetspeedPipeline.invoke(JetspeedPipeline.java:185) org.apache.jetspeed.engine.JetspeedEngine.service(JetspeedEngine.java:208) org.apache.jetspeed.engine.JetspeedServlet.doGet(JetspeedServlet.java:215) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) java.lang.Thread.run(Thread.java:595) ---------------------------------------------------------------------- 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