Hi,
I'm getting a error that I'm a bit confused about. I believe I'm doing everything properly. A NullPointerException is thrown (trace pasted below) when using the <html:messages> tag. Here's what I've done step by step.
In my form bean, I have a validate method that creates a list of ActionErrors.
ActionErrors errors = new ActionErrors();
if (StringUtils.isEmpty(getSubject())) {
errors.add("subject", new ActionError("Please provide a valid subject."));
}
if (StringUtils.isEmpty(getDescription())) {
errors.add("description", new ActionError("Please provide a valid message description."));
}
I call this validate method in my action class:
errors = topicForm.validate(mapping, request);
if (!errors.isEmpty()) {
saveErrors(request, errors);
saveToken(request);
return (new ActionForward(mapping.getInput()));
}On my jsp I'm using the following tags to present the errors:
<logic:messagesPresent>
The following errors have occured.
<html:messages id="error">
<li><c:out value="${error}"/></li>
</html:messages>
<hr>
</logic:messagesPresent>It appears that the <html:messages> tag is what makes it blow up.
Anyone have any ideas?
Thanks, eric
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:393)
at org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.j ava:234)
at org.apache.struts.taglib.html.MessagesTag.doAfterBody(MessagesTag.java: 312)
at org.apache.jsp.PostTopic_jsp._jspService(PostTopic_jsp.java:180)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja va:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: 295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatc her.java:684)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDisp atcher.java:432)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispat cher.java:356)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.jav a:1069)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProc essor.java:274)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestPr ocessor.java:455)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(Tiles RequestProcessor.java:320)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 279)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java: 480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:643)
at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurity MgrRealm.java:220)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.ja va:246)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.jboss.web.tomcat.tc4.statistics.ContainerStatsValve.invoke(Container StatsValve.java:76)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java: 480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java: 2417)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa lve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAs sociationValve.java:65)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 577)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java: 480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i nvokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java: 480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:197)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java: 781)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC onnection(Http11Protocol.java:549)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java: 605)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:677)
at java.lang.Thread.run(Thread.java:552)
