[ 
https://issues.apache.org/jira/browse/TAPESTRY-2468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615750#action_12615750
 ] 

Joe Hart commented on TAPESTRY-2468:
------------------------------------

Looks like we are running into this deadlock as well in 5.0.11.  We tried the 
patch associated with this issue and still were able to reproduce the deadlock. 
 Any hope of reopening this issue?

Here is a thread dump showing two deadlocks we have encountered:

Found one Java-level deadlock:
=============================
"http-8080-Processor10":
waiting to lock monitor 0x08194f04 (object 0x73ba51d8, a 
org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader),
which is held by "http-8080-Processor9"
"http-8080-Processor9":
waiting to lock monitor 0x08192efc (object 0x909ecc08, a java.lang.Class),
which is held by "http-8080-Processor10"

And another deadlock we came across:
Found one Java-level deadlock:
=============================
"http-8080-Processor9":
waiting to lock monitor 0x08a5a838 (object 0x95b84218, a java.lang.Object),
which is held by "http-8080-Processor8"
"http-8080-Processor8":
waiting to lock monitor 0x08a5be7c (object 0x92160ad8, a java.lang.Class),
which is held by "http-8080-Processor5"
"http-8080-Processor5":
waiting to lock monitor 0x8e392558 (object 0x9601bea0, a 
org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader),
which is held by "http-8080-Processor8"

> A deadlock related to class loading (and creation) can occur
> ------------------------------------------------------------
>
>                 Key: TAPESTRY-2468
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2468
>             Project: Tapestry
>          Issue Type: Bug
>          Components: tapestry-ioc
>    Affects Versions: 5.0.11
>            Reporter: jens breitenstein
>            Assignee: Howard M. Lewis Ship
>            Priority: Critical
>             Fix For: 5.0.14
>
>
> Hi All! 
> We encountered a deadlock situation using T5.0.11 under heavy load. 
> Unfortunately we do not have the detailed knowledge about all 
> T5/javassist-secrets to solve this on our own. 
> It seems there are two different execution paths resulting in a call to 
> "ClassPool.toClass". In both cases the inner class 
> org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader
>  is part of the deadlock. 
> On the one hand we have a call to 
> "findClass(ComponentInstantiatorSourceImpl.java:75)" (please see 
> "catalina-40.txt") on the other hand the toClass2 method tries to access this 
> inner class at the same time. But this is only a guess. 
> See below both thread dump stacktraces. 
> Any hint to solve this problem is highly appreciated. 
> Jens 
> "catalina-exec-11" Id=67 BLOCKED on [EMAIL PROTECTED] owned by 
> "catalina-exec-40" Id=96 
> at java.lang.ClassLoader.defineClass1(Native Method) 
> at java.lang.ClassLoader.defineClass(ClassLoader.java:675) 
> at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source) 
> at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>  
> at java.lang.reflect.Method.invoke(Method.java:585) 
> at javassist.ClassPool.toClass2(ClassPool.java:965) 
> at javassist.ClassPool.toClass(ClassPool.java:947) 
> at 
> org.apache.tapestry.ioc.internal.services.CtClassSource.createClass(CtClassSource.java:87)
>  
> at 
> org.apache.tapestry.ioc.internal.services.AbstractFab.createClass(AbstractFab.java:106)
>  
> at 
> org.apache.tapestry.internal.services.PropertyConduitSourceImpl.build(PropertyConduitSourceImpl.java:185)
>  
> at 
> org.apache.tapestry.internal.services.PropertyConduitSourceImpl.create(PropertyConduitSourceImpl.java:120)
> at 
> $PropertyConduitSource_11a6cad5e6b.create($PropertyConduitSource_11a6cad5e6b.java)
>  
> at 
> org.apache.tapestry.internal.bindings.PropBindingFactory.newBinding(PropBindingFactory.java:48)
>  
> at $BindingFactory_11a6cad5e6c.newBinding($BindingFactory_11a6cad5e6c.java) 
> at $BindingFactory_11a6cad5e63.newBinding($BindingFactory_11a6cad5e63.java) 
> at 
> org.apache.tapestry.internal.services.BindingSourceImpl.newBinding(BindingSourceImpl.java:79)
>  
> at $BindingSource_11a6cad5e55.newBinding($BindingSource_11a6cad5e55.java) 
> at 
> org.apache.tapestry.internal.services.PageElementFactoryImpl.parseAttributeExpansionExpression(PageElementFactoryImpl.java:127)
> at 
> org.apache.tapestry.internal.services.PageElementFactoryImpl.newBinding(PageElementFactoryImpl.java:299)
> at 
> $PageElementFactory_11a6cad5e4f.newBinding($PageElementFactory_11a6cad5e4f.java)
>  
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.findBinding(PageLoaderProcessor.java:264)
>  
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.bindParametersFromModel(PageLoaderProcessor.java:217)
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.startComponent(PageLoaderProcessor.java:667)
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.loadTemplateForComponent(PageLoaderProcessor.java:500)
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.workComponentQueue(PageLoaderProcessor.java:807)
> at 
> org.apache.tapestry.internal.services.PageLoaderProcessor.loadPage(PageLoaderProcessor.java:392)
>  
> at 
> org.apache.tapestry.internal.services.PageLoaderImpl.loadPage(PageLoaderImpl.java:59)
>  
> at $PageLoader_11a6cad5e4d.loadPage($PageLoader_11a6cad5e4d.java) 
> at 
> org.apache.tapestry.internal.services.PagePoolCache.checkout(PagePoolCache.java:188)
>  
> at 
> org.apache.tapestry.internal.services.PagePoolImpl.checkout(PagePoolImpl.java:107)
>  
> at $PagePool_11a6cad5e4c.checkout($PagePool_11a6cad5e4c.java) 
> at 
> org.apache.tapestry.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:43)
>  
> at $RequestPageCache_11a6cad5e4b.get($RequestPageCache_11a6cad5e4b.java) 
> at $RequestPageCache_11a6cad5e0d.get($RequestPageCache_11a6cad5e0d.java) 
> at 
> org.apache.tapestry.internal.services.LinkFactoryImpl.createPageLink(LinkFactoryImpl.java:273)
>  
> at $LinkFactory_11a6cad5e47.createPageLink($LinkFactory_11a6cad5e47.java) 
> at 
> org.apache.tapestry.internal.structure.PageImpl.createPageLink(PageImpl.java:161)
>  
> at 
> org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.createPageLink(InternalComponentResourcesImpl.java:129)
> at 
> org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java:73) 
> at org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java) 
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl$11$1.run(ComponentPageElementImpl.java:338)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:874)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl.access$100(ComponentPageElementImpl.java:54)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl$11.render(ComponentPageElementImpl.java:342)
> at 
> org.apache.tapestry.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:63)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:84)
>  
> at $PageRenderQueue_11a6cad61e4.render($PageRenderQueue_11a6cad61e4.java) 
> at $PageRenderQueue_11a6cad61dd.render($PageRenderQueue_11a6cad61dd.java) 
> at 
> org.apache.tapestry.services.TapestryModule$19.renderMarkup(TapestryModule.java:1293)
>  
> at 
> nz.toc.taptoolsapp.services.CustomValidationDecoratorRenderer.renderMarkup(CustomValidationDecoratorRenderer.java:28)
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$23.renderMarkup(TapestryModule.java:1402)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$22.renderMarkup(TapestryModule.java:1383)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$21.renderMarkup(TapestryModule.java:1365)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at nz.toc.taptoolsapp.services.AppModule$1.renderMarkup(AppModule.java:79) 
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$20.renderMarkup(TapestryModule.java:1347)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at $MarkupRenderer_11a6cad61e2.renderMarkup($MarkupRenderer_11a6cad61e2.java) 
> at 
> org.apache.tapestry.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:55)
> at 
> $PageMarkupRenderer_11a6cad61e0.renderPageMarkup($PageMarkupRenderer_11a6cad61e0.java)
>  
> at 
> org.apache.tapestry.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:57)
> at 
> $PageResponseRenderer_11a6cad5e45.renderPageResponse($PageResponseRenderer_11a6cad5e45.java)
> at 
> org.apache.tapestry.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:59)
> at 
> org.apache.tapestry.services.TapestryModule$29.handle(TapestryModule.java:1607)
>  
> at 
> $PageRenderRequestHandler_11a6cad5e46.handle($PageRenderRequestHandler_11a6cad5e46.java)
>  
> at 
> $PageRenderRequestHandler_11a6cad5e3b.handle($PageRenderRequestHandler_11a6cad5e3b.java)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderDispatcher.process(PageRenderDispatcher.java:97)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:73)
>  
> at $Dispatcher_11a6cad5e42.dispatch($Dispatcher_11a6cad5e42.java) 
> at $Dispatcher_11a6cad5e33.dispatch($Dispatcher_11a6cad5e33.java) 
> at 
> org.apache.tapestry.services.TapestryModule$13.service(TapestryModule.java:944)
>  
> at de.XYZ.client.services.AppModule$1.service(AppModule.java:92) 
> at $RequestFilter_11a6cad5e32.service($RequestFilter_11a6cad5e32.java) 
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.LocalizationFilter.service(LocalizationFilter.java:42)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.services.TapestryModule$3.service(TapestryModule.java:553)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> nu.localhost.tapestry.acegi.services.internal.RequestFilterWrapper$1.doFilter(RequestFilterWrapper.java:60)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.AcegiExceptionTranslationFilter.doFilter(AcegiExceptionTranslationFilter.java:67)
> at 
> nu.localhost.tapestry.acegi.services.internal.RequestFilterWrapper.service(RequestFilterWrapper.java:54)
>  
> at $RequestFilter_11a6cad5e2e.service($RequestFilter_11a6cad5e2e.java) 
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:520)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:93)
>  
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:84)
>  
> at 
> org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
>  
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:106)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at $RequestHandler_11a6cad5e29.service($RequestHandler_11a6cad5e29.java) 
> at 
> org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:924)
>  
> at de.XYZ.client.services.AppModule$3.service(AppModule.java:152) 
> at 
> $HttpServletRequestFilter_11a6cad5e28.service($HttpServletRequestFilter_11a6cad5e28.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> org.apache.tapestry.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
>  
> at 
> $HttpServletRequestFilter_11a6cad5e27.service($HttpServletRequestFilter_11a6cad5e27.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e26.service($HttpServletRequestFilter_11a6cad5e26.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e25.service($HttpServletRequestFilter_11a6cad5e25.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e24.service($HttpServletRequestFilter_11a6cad5e24.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e23.service($HttpServletRequestFilter_11a6cad5e23.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e22.service($HttpServletRequestFilter_11a6cad5e22.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e21.service($HttpServletRequestHandler_11a6cad5e21.java)
>  
> at org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:168) 
> at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>  
> at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>  
> at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>  
> at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>  
> at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
> at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
> at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>  
> at com.jamonapi.http.JAMonTomcatValve.invoke(JAMonTomcatValve.java:72) 
> at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) 
> at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
> at 
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>  
> at 
> org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:354)
>  
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
>  
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
>  
> at java.lang.Thread.run(Thread.java:613) 
> "catalina-exec-40" Id=96 BLOCKED on [EMAIL PROTECTED] owned by 
> "catalina-exec-11" Id=67 
> at javassist.ClassPool.toClass2(ClassPool.java:964) 
> at javassist.ClassPool.toClass(ClassPool.java:947) 
> at 
> org.apache.tapestry.ioc.internal.services.CtClassSource.createClass(CtClassSource.java:87)
>  
> at 
> org.apache.tapestry.ioc.internal.services.AbstractFab.createClass(AbstractFab.java:106)
>  
> at 
> org.apache.tapestry.ioc.internal.ModuleImpl.createProxyInstance(ModuleImpl.java:378)
>  
> at 
> org.apache.tapestry.ioc.internal.ModuleImpl.createProxy(ModuleImpl.java:341) 
> at org.apache.tapestry.ioc.internal.ModuleImpl.create(ModuleImpl.java:233) 
> at 
> org.apache.tapestry.ioc.internal.ModuleImpl.findOrCreate(ModuleImpl.java:163) 
> at org.apache.tapestry.ioc.internal.ModuleImpl.getService(ModuleImpl.java:91) 
> at 
> org.apache.tapestry.ioc.internal.RegistryImpl.getService(RegistryImpl.java:293)
>  
> at 
> org.apache.tapestry.ioc.internal.RegistryImpl.getService(RegistryImpl.java:523)
>  
> at 
> org.apache.tapestry.ioc.internal.ObjectLocatorImpl.getService(ObjectLocatorImpl.java:45)
>  
> at 
> org.apache.tapestry.internal.services.ServiceInjectionProvider.provideInjection(ServiceInjectionProvider.java:40)
> at 
> $InjectionProvider_11a6cad5e61.provideInjection($InjectionProvider_11a6cad5e61.java)
>  
> at 
> $InjectionProvider_11a6cad5e59.provideInjection($InjectionProvider_11a6cad5e59.java)
>  
> at 
> org.apache.tapestry.internal.transform.InjectWorker.transform(InjectWorker.java:57)
>  
> at 
> $ComponentClassTransformWorker_11a6cad5e5d.transform($ComponentClassTransformWorker_11a6cad5e5d.java)
> at 
> $ComponentClassTransformWorker_11a6cad5e57.transform($ComponentClassTransformWorker_11a6cad5e57.java)
> at 
> org.apache.tapestry.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:147)
> at 
> $ComponentClassTransformer_11a6cad5e1d.transformComponentClass($ComponentClassTransformer_11a6cad5e1d.java)
> at 
> org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl.onLoad(ComponentInstantiatorSourceImpl.java:166)
> at javassist.Loader.findClass(Loader.java:340) 
> at 
> org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl$PackageAwareLoader.findClass(ComponentInstantiatorSourceImpl.java:75)
> at javassist.Loader.loadClass(Loader.java:311) 
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251) 
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374) 
> at 
> de.XYZ.client.components.template.TemplateSessioninfo.getLogoutLink(TemplateSessioninfo.java:25)
>  
> at $PropertyConduit_11a6cad60e2.get($PropertyConduit_11a6cad60e2.java) 
> at org.apache.tapestry.internal.bindings.PropBinding.get(PropBinding.java:53) 
> at 
> org.apache.tapestry.internal.services.PageElementFactoryImpl$2.provideString(PageElementFactoryImpl.java:136)
> at 
> org.apache.tapestry.internal.services.AttributeExpansionBinding.get(AttributeExpansionBinding.java:37)
>  
> at 
> org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.readParameter(InternalComponentResourcesImpl.java:233)
> at 
> org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.readParameter(InternalComponentResourcesImpl.java:248)
> at 
> org.apache.tapestry.corelib.components.PageLink._$read_parameter_page(PageLink.java)
>  
> at 
> org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java:73) 
> at org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java) 
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl$11$1.run(ComponentPageElementImpl.java:338)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:874)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl.access$100(ComponentPageElementImpl.java:54)
> at 
> org.apache.tapestry.internal.structure.ComponentPageElementImpl$11.render(ComponentPageElementImpl.java:342)
> at 
> org.apache.tapestry.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:63)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:84)
>  
> at $PageRenderQueue_11a6cad61e4.render($PageRenderQueue_11a6cad61e4.java) 
> at $PageRenderQueue_11a6cad61dd.render($PageRenderQueue_11a6cad61dd.java) 
> at 
> org.apache.tapestry.services.TapestryModule$19.renderMarkup(TapestryModule.java:1293)
>  
> at 
> nz.toc.taptoolsapp.services.CustomValidationDecoratorRenderer.renderMarkup(CustomValidationDecoratorRenderer.java:28)
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$23.renderMarkup(TapestryModule.java:1402)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$22.renderMarkup(TapestryModule.java:1383)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$21.renderMarkup(TapestryModule.java:1365)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at nz.toc.taptoolsapp.services.AppModule$1.renderMarkup(AppModule.java:79) 
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at 
> org.apache.tapestry.services.TapestryModule$20.renderMarkup(TapestryModule.java:1347)
>  
> at $MarkupRenderer_11a6cad61e6.renderMarkup($MarkupRenderer_11a6cad61e6.java) 
> at $MarkupRenderer_11a6cad61e2.renderMarkup($MarkupRenderer_11a6cad61e2.java) 
> at 
> org.apache.tapestry.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:55)
> at 
> $PageMarkupRenderer_11a6cad61e0.renderPageMarkup($PageMarkupRenderer_11a6cad61e0.java)
>  
> at 
> org.apache.tapestry.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:57)
> at 
> $PageResponseRenderer_11a6cad5e45.renderPageResponse($PageResponseRenderer_11a6cad5e45.java)
> at 
> org.apache.tapestry.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:59)
> at 
> org.apache.tapestry.services.TapestryModule$29.handle(TapestryModule.java:1607)
>  
> at 
> $PageRenderRequestHandler_11a6cad5e46.handle($PageRenderRequestHandler_11a6cad5e46.java)
>  
> at 
> $PageRenderRequestHandler_11a6cad5e3b.handle($PageRenderRequestHandler_11a6cad5e3b.java)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderDispatcher.process(PageRenderDispatcher.java:97)
>  
> at 
> org.apache.tapestry.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:73)
>  
> at $Dispatcher_11a6cad5e42.dispatch($Dispatcher_11a6cad5e42.java) 
> at $Dispatcher_11a6cad5e33.dispatch($Dispatcher_11a6cad5e33.java) 
> at 
> org.apache.tapestry.services.TapestryModule$13.service(TapestryModule.java:944)
>  
> at de.XYZ.client.services.AppModule$1.service(AppModule.java:92) 
> at $RequestFilter_11a6cad5e32.service($RequestFilter_11a6cad5e32.java) 
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.LocalizationFilter.service(LocalizationFilter.java:42)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.services.TapestryModule$3.service(TapestryModule.java:553)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> nu.localhost.tapestry.acegi.services.internal.RequestFilterWrapper$1.doFilter(RequestFilterWrapper.java:60)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.AcegiExceptionTranslationFilter.doFilter(AcegiExceptionTranslationFilter.java:67)
> at 
> nu.localhost.tapestry.acegi.services.internal.RequestFilterWrapper.service(RequestFilterWrapper.java:54)
>  
> at $RequestFilter_11a6cad5e2e.service($RequestFilter_11a6cad5e2e.java) 
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:520)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:93)
>  
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:84)
>  
> at 
> org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
>  
> at 
> org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:106)
>  
> at $RequestHandler_11a6cad5e34.service($RequestHandler_11a6cad5e34.java) 
> at $RequestHandler_11a6cad5e29.service($RequestHandler_11a6cad5e29.java) 
> at 
> org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:924)
>  
> at de.XYZ.client.services.AppModule$3.service(AppModule.java:152) 
> at 
> $HttpServletRequestFilter_11a6cad5e28.service($HttpServletRequestFilter_11a6cad5e28.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> org.apache.tapestry.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
>  
> at 
> $HttpServletRequestFilter_11a6cad5e27.service($HttpServletRequestFilter_11a6cad5e27.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e26.service($HttpServletRequestFilter_11a6cad5e26.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e25.service($HttpServletRequestFilter_11a6cad5e25.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e24.service($HttpServletRequestFilter_11a6cad5e24.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e23.service($HttpServletRequestFilter_11a6cad5e23.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:57)
> at 
> org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
> at 
> nu.localhost.tapestry.acegi.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
> at 
> $HttpServletRequestFilter_11a6cad5e22.service($HttpServletRequestFilter_11a6cad5e22.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e2a.service($HttpServletRequestHandler_11a6cad5e2a.java)
>  
> at 
> $HttpServletRequestHandler_11a6cad5e21.service($HttpServletRequestHandler_11a6cad5e21.java)
>  
> at org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:168) 
> at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>  
> at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>  
> at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>  
> at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>  
> at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
> at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
> at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>  
> at com.jamonapi.http.JAMonTomcatValve.invoke(JAMonTomcatValve.java:72) 
> at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) 
> at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
> at 
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>  
> at 
> org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:354)
>  
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
>  
> at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
>  
> at java.lang.Thread.run(Thread.java:613) 
> Howard suggested:
> Please add an issue to JIRA. Looks like there's a situation where one thread 
> is transforming classes while another thread is creating PropertyConduit 
> classes. We'll need to create a mutex for this case. 

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