I'm guessing that this is a bug in the way websphere 8 handles either classloaders or threadlocals.
Tapestry injects the ComponentResources via InjectWorker, InjectionProvider2 and CommonResourcesInjectionProvider. You could try to add some logging to CommonResourcesInjectionProvider to see what's going on. Perhaps the InstanceContext is in some state where ComponentResources is null? On 9 Jul 2013 08:55, "Christian Köberl" < tapestry.christian.koeb...@gmail.com> wrote: > We're still searching (debugging, tracing) to find the reason for this NPE. > > During our tests the same problem occurred in some more places (the > original one was Form:406): > > - org.apache.tapestry5.corelib.components.Form.beginRender(Form.java:408) > Corresponding line from Tapestry Form: > resources.triggerEvent(EventConstants.PREPARE, context, null); > The strange part here is that the code line before (406) uses the > same field "resources" without a NPE: > resources.triggerEvent(EventConstants.PREPARE_FOR_RENDER, context, > null); > > - org.apache.tapestry5.corelib.components.Zone.beginRender(Zone.java:171) > Corresponding line from Tapestry Zone: > clientBehaviorSupport.addZone(clientId, show, update); > > Another "fun" fact: the NPE in Zone only occurs on one page whereas > the NPE in Form occurs on all pages using a Form. > > Anyone an idea? > > > 2013/6/25 Christian Köberl <tapestry.christian.koeb...@gmail.com>: > > We have a quite strange behavior on IBM Websphere 8 / IBM Java 6 - we > > get a NullPointerException in Form.java:406 (Tapestry 5.2.6). > > Here's the corresponding line from Form.java:406: > > resources.triggerEvent(EventConstants.PREPARE_FOR_RENDER, context, null); > > > > The NPE first is raised after some parallel users are working with the > > application - before that everything works fine. After the first > > occurrence, the NPE is raised on *any* Form render on *any* page for > > *all* users. We have to restart the application to get it working > > again. We can reproduce the error with some load but the first NPE > > happens on different pages - so that's no clue. > > > > Happily we found this during our tests on WAS8 (not in production) - > > we were migrating from WAS6 (the same version of the application runs > > fine on WAS6). > > > > Has anybody an idea what's happening here? > > > > Thx, > > Chris > > > > Hers is the full stack trace for one page (looks the same for all pages): > > > > org.apache.tapestry5.internal.services.RenderQueueException: Render > > queue error in BeginRender[organization/user/List:form]: > > org.apache.tapestry5.ioc.internal.util.TapestryException [at > > classpath:ourapp/organization/web/pages/user/UserList.tml, line 47] > > at > org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:84) > > at > org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:127) > > at > $PageRenderQueue_13f76df51b3.render($PageRenderQueue_13f76df51b3.java) > > at > $PageRenderQueue_13f76df5192.render($PageRenderQueue_13f76df5192.java) > > at > org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37) > > at ourapp.ui.UIModule$2.renderMarkup(UIModule.java:234) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at ourapp.ui.UIModule$1.renderMarkup(UIModule.java:211) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:2089) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:2073) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$27.renderMarkup(TapestryModule.java:2055) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$26.renderMarkup(TapestryModule.java:2040) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$25.renderMarkup(TapestryModule.java:2026) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$24.renderMarkup(TapestryModule.java:2008) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > org.apache.tapestry5.services.TapestryModule$23.renderMarkup(TapestryModule.java:1989) > > at > $MarkupRenderer_13f76df51b5.renderMarkup($MarkupRenderer_13f76df51b5.java) > > at > $MarkupRenderer_13f76df51b2.renderMarkup($MarkupRenderer_13f76df51b2.java) > > at > org.apache.tapestry5.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:47) > > at > $PageMarkupRenderer_13f76df51af.renderPageMarkup($PageMarkupRenderer_13f76df51af.java) > > at > org.apache.tapestry5.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:67) > > at > ourapp.ui.internal.services.CacheHeaderPageResponseRendererDecorator.renderPageResponse(CacheHeaderPageResponseRendererDecorator.java:27) > > at > $PageResponseRenderer_13f76df51ab.renderPageResponse($PageResponseRenderer_13f76df51ab.java) > > at > org.apache.tapestry5.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:64) > > at > org.apache.tapestry5.services.TapestryModule$36.handle(TapestryModule.java:2326) > > at > $PageRenderRequestHandler_13f76df51ad.handle($PageRenderRequestHandler_13f76df51ad.java) > > at > $PageRenderRequestHandler_13f76df51a8.handle($PageRenderRequestHandler_13f76df51a8.java) > > at > org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handlePageRender(ComponentRequestHandlerTerminator.java:48) > > at > ourapp.ui.services.SingleRequestFilter.handlePageRender(SingleRequestFilter.java:85) > > at > $ComponentRequestHandler_13f76df51a9.handlePageRender($ComponentRequestHandler_13f76df51a9.java) > > at > org.apache.tapestry5.services.InitializeActivePageName.handlePageRender(InitializeActivePageName.java:47) > > at > $ComponentRequestHandler_13f76df51a9.handlePageRender($ComponentRequestHandler_13f76df51a9.java) > > at > $ComponentRequestHandler_13f76df50da.handlePageRender($ComponentRequestHandler_13f76df50da.java) > > at > org.apache.tapestry5.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:45) > > at $Dispatcher_13f76df50e0.dispatch($Dispatcher_13f76df50e0.java) > > at $Dispatcher_13f76df50d7.dispatch($Dispatcher_13f76df50d7.java) > > at > org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:321) > > at > org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:984) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:974) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > ourapp.ui.internal.services.LocaleContextHolderSetter.service(LocaleContextHolderSetter.java:30) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90) > > at > org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:80) > > at > org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85) > > at > org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103) > > at > $RequestHandler_13f76df50d8.service($RequestHandler_13f76df50d8.java) > > at > $RequestHandler_13f76df50c4.service($RequestHandler_13f76df50c4.java) > > at > org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:272) > > at > ourapp.webservice.JaxWsHttpServletRequestFilter.service(JaxWsHttpServletRequestFilter.java:120) > > at > $HttpServletRequestFilter_13f76df50c3.service($HttpServletRequestFilter_13f76df50c3.java) > > at > $HttpServletRequestHandler_13f76df50c6.service($HttpServletRequestHandler_13f76df50c6.java) > > at > org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44) > > at > $HttpServletRequestHandler_13f76df50c6.service($HttpServletRequestHandler_13f76df50c6.java) > > at > $HttpServletRequestHandler_13f76df50c6.service($HttpServletRequestHandler_13f76df50c6.java) > > at > org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62) > > at > $HttpServletRequestFilter_13f76df50c1.service($HttpServletRequestFilter_13f76df50c1.java) > > at > $HttpServletRequestHandler_13f76df50c6.service($HttpServletRequestHandler_13f76df50c6.java) > > at > org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:928) > > at > $HttpServletRequestHandler_13f76df50c6.service($HttpServletRequestHandler_13f76df50c6.java) > > at > $HttpServletRequestHandler_13f76df50bf.service($HttpServletRequestHandler_13f76df50bf.java) > > at > ourapp.ui.tapestry.TapestryFilter$TapestryFilterChain.doFilter(TapestryFilter.java:63) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) > > at > org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) > > at > org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > ourapp.security.services.PreAuthenticatedProcessingFilterChain$VirtualFilterChain.doFilter(PreAuthenticatedProcessingFilterChain.java:80) > > at > ourapp.security.services.PreAuthenticatedProcessingFilterChain.doFilter(PreAuthenticatedProcessingFilterChain.java:45) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) > > at > org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) > > at > org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) > > at > org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) > > at > ourapp.ui.tapestry.TapestryFilter.doFilter(TapestryFilter.java:137) > > at > com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:195) > > at > com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:91) > > at > com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:928) > > at > com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1025) > > at > com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3751) > > at > com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:304) > > at > com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:962) > > at > com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662) > > at > com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:195) > > at > com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452) > > at > com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511) > > at > com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305) > > at > com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276) > > at > com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214) > > at > com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113) > > at > com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) > > at > com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) > > at > com.ibm.io.async.AsyncChannelFuture$1.run(AsyncChannelFuture.java:205) > > at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1690) > > Caused by: > > org.apache.tapestry5.ioc.internal.util.TapestryException [at > > classpath:ourapp/organization/web/pages/user/UserList.tml, line 47] > > at > org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:194) > > at > org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.render(ComponentPageElementImpl.java:246) > > at > org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72) > > ... 118 more > > Caused by: > > java.lang.NullPointerException > > at > org.apache.tapestry5.corelib.components.Form.beginRender(Form.java:406) > > at > org.apache.tapestry5.corelib.components.Form$MethodAccess_beginRender_13f76df5156.invoke(Form$MethodAccess_beginRender_13f76df5156.java) > > at > org.apache.tapestry5.internal.transform.RenderPhaseMethodWorker$Invoker.invoke(RenderPhaseMethodWorker.java:117) > > at > org.apache.tapestry5.internal.transform.RenderPhaseMethodWorker$RenderPhaseMethodAdvice.advise(RenderPhaseMethodWorker.java:86) > > at > org.apache.tapestry5.internal.services.AbstractComponentMethodInvocation.proceed(AbstractComponentMethodInvocation.java:86) > > at > org.apache.tapestry5.corelib.components.Form.beginRender(Form.java) > > at > org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.invokeComponent(ComponentPageElementImpl.java:239) > > at > org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:186) > > ... 120 more > > 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