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https://issues.apache.org/jira/browse/TAP5-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680501#action_12680501
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Thiago H. de Paula Figueiredo commented on TAP5-554:
----------------------------------------------------
A very similar exception happens when doing an AJAX form submit, so I guess
this is not a problem just with AjaxFormLoop, but with AJAX rendering itself.
> NPE when click addRow within AjaxFormLoop
> -----------------------------------------
>
> Key: TAP5-554
> URL: https://issues.apache.org/jira/browse/TAP5-554
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.0, 5.1.0.1
> Reporter: Yunhua Sang
> Priority: Minor
>
> On the screen:
> Ajax failure: Status 500 for
> /tapestry/forminjectordemo.loop.rowinjector:inject/1236217007110?t:ac=FakePageActivationContextValue&t:formcomponentid=FormInjectorDemo:form&t:formid=form:
> java.lang.NullPointerException
> In console:
> ERROR] RequestExceptionHandler Processing of request failed with uncaught
> exception: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.tapestry5.dom.Element.createNamespaceURIToPrefix(Element.java:678)
> at org.apache.tapestry5.dom.Element.toMarkup(Element.java:335)
> at org.apache.tapestry5.dom.Element.writeChildMarkup(Element.java:872)
> at org.apache.tapestry5.dom.Element.getChildMarkup(Element.java:885)
> at
> org.apache.tapestry5.internal.services.PageRenderQueueImpl.renderPartial(PageRenderQueueImpl.java:163)
> at
> $PageRenderQueue_11fd441d050.renderPartial($PageRenderQueue_11fd441d050.java)
> at
> $PageRenderQueue_11fd441d04f.renderPartial($PageRenderQueue_11fd441d04f.java)
> at
> org.apache.tapestry5.internal.services.PartialMarkupRendererTerminator.renderMarkup(PartialMarkupRendererTerminator.java:39)
> at
> org.apache.tapestry5.services.TapestryModule$31.renderMarkup(TapestryModule.java:1821)
> at
> $PartialMarkupRenderer_11fd441d129.renderMarkup($PartialMarkupRenderer_11fd441d129.java)
> at
> org.apache.tapestry5.services.TapestryModule$30.renderMarkup(TapestryModule.java:1802)
> at
> $PartialMarkupRenderer_11fd441d129.renderMarkup($PartialMarkupRenderer_11fd441d129.java)
> at
> org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:1784)
> at
> $PartialMarkupRenderer_11fd441d129.renderMarkup($PartialMarkupRenderer_11fd441d129.java)
> at
> org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:1766)
> at
> $PartialMarkupRenderer_11fd441d129.renderMarkup($PartialMarkupRenderer_11fd441d129.java)
> at
> org.apache.tapestry5.services.TapestryModule$27.renderMarkup(TapestryModule.java:1740)
> at
> $PartialMarkupRenderer_11fd441d129.renderMarkup($PartialMarkupRenderer_11fd441d129.java)
> at
> $PartialMarkupRenderer_11fd441d128.renderMarkup($PartialMarkupRenderer_11fd441d128.java)
> at
> org.apache.tapestry5.internal.services.AjaxPartialResponseRendererImpl.renderPartialPageMarkup(AjaxPartialResponseRendererImpl.java:79)
> at
> $AjaxPartialResponseRenderer_11fd441d126.renderPartialPageMarkup($AjaxPartialResponseRenderer_11fd441d126.java)
> at
> org.apache.tapestry5.internal.services.AjaxComponentEventRequestHandler.handle(AjaxComponentEventRequestHandler.java:118)
> at
> $ComponentEventRequestHandler_11fd441d123.handle($ComponentEventRequestHandler_11fd441d123.java)
> at
> org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
> at
> $ComponentEventRequestHandler_11fd441d125.handle($ComponentEventRequestHandler_11fd441d125.java)
> at
> org.apache.tapestry5.services.TapestryModule$35.handle(TapestryModule.java:2109)
> at
> $ComponentEventRequestHandler_11fd441d125.handle($ComponentEventRequestHandler_11fd441d125.java)
> at
> $ComponentEventRequestHandler_11fd441cffd.handle($ComponentEventRequestHandler_11fd441cffd.java)
> at
> org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
> at
> $ComponentRequestHandler_11fd441cff6.handleComponentEvent($ComponentRequestHandler_11fd441cff6.java)
> at
> org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:138)
> at $Dispatcher_11fd441cff7.dispatch($Dispatcher_11fd441cff7.java)
> at $Dispatcher_11fd441cfed.dispatch($Dispatcher_11fd441cfed.java)
> at
> org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:246)
> at
> org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at
> org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:765)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at
> org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:755)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at
> org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:85)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at
> org.apache.tapestry5.integration.app1.services.AppModule$2.service(AppModule.java:90)
> at $RequestFilter_11fd441cfea.service($RequestFilter_11fd441cfea.java)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:81)
> at
> org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
> at
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103)
> at $RequestHandler_11fd441cfee.service($RequestHandler_11fd441cfee.java)
> at $RequestHandler_11fd441cfe3.service($RequestHandler_11fd441cfe3.java)
> at
> org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:198)
> at
> org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
> at
> $HttpServletRequestHandler_11fd441cfe5.service($HttpServletRequestHandler_11fd441cfe5.java)
> at
> org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
> at
> $HttpServletRequestFilter_11fd441cfe2.service($HttpServletRequestFilter_11fd441cfe2.java)
> at
> $HttpServletRequestHandler_11fd441cfe5.service($HttpServletRequestHandler_11fd441cfe5.java)
> at
> org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:717)
> at
> $HttpServletRequestHandler_11fd441cfe5.service($HttpServletRequestHandler_11fd441cfe5.java)
> at
> $HttpServletRequestHandler_11fd441cfe0.service($HttpServletRequestHandler_11fd441cfe0.java)
> at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:127)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
> at
> org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
> at org.mortbay.http.HttpServer.service(HttpServer.java:909)
> at org.mortbay.http.HttpConnection.service(HttpConnection.java:816)
> at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:982)
> at org.mortbay.http.HttpConnection.handle(HttpConnection.java:833)
> at
> org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
> at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
> at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
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