Make sure you properly initialize the object referenced by the form. The 
onPrepare() method is a good place to do that.



Am 02.08.2013 um 09:06 schrieb "Will N." <llcool_wil...@yahoo.fr>:

> Hi,
> i have some issues trying to save an Entitie in the database after filling 
> the coresponding form. In fact i figured out that the Entity(Object) is Null 
> after a press the save button of the form. This is confusing because I do not 
> have this effect with other entities and forms of my application.
> Debug took me to the LoggingAdvice.class. Any idea what i am doing wrong?
> 
> Thanks!
> 
> Will
> 
> [DEBUG] projekt.AnlegenProjekt [ FAIL] onSuccess -- 
> java.lang.NullPointerException
> java.lang.NullPointerException
>    at 
> com.example.pms.pages.projekt.AnlegenProjekt.advised$onSuccess_46d5fa76bdf8(AnlegenProjekt.java:161)
>    at 
> com.example.pms.pages.projekt.AnlegenProjekt$Invocation_onSuccess_46d5fa76bdf7.proceedToAdvisedMethod(Unknown
>  Source)
>    at 
> org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
>    at 
> org.apache.tapestry5.ioc.internal.services.LoggingAdvice.advise(LoggingAdvice.java:45)
>    at 
> org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
>    at 
> com.example.pms.pages.projekt.AnlegenProjekt.onSuccess(AnlegenProjekt.java)
>    at 
> com.example.pms.pages.projekt.AnlegenProjekt.dispatchComponentEvent(AnlegenProjekt.java)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:927)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1112)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1057)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1054)
>    at 
> org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
>    at 
> org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
>    at 
> org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1124)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:146)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1053)
>    at 
> org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.triggerContextEvent(InternalComponentResourcesImpl.java:302)
>    at 
> org.apache.tapestry5.corelib.components.Form.advised$onAction_46d5fa76bdd6(Form.java:545)
>    at 
> org.apache.tapestry5.corelib.components.Form$Invocation_onAction_46d5fa76bdd5.proceedToAdvisedMethod(Unknown
>  Source)
>    at 
> org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
>    at 
> org.apache.tapestry5.ioc.internal.services.LoggingAdvice.advise(LoggingAdvice.java:37)
>    at 
> org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
>    at org.apache.tapestry5.corelib.components.Form.onAction(Form.java)
>    at 
> org.apache.tapestry5.corelib.components.Form.dispatchComponentEvent(Form.java)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:927)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1112)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1057)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1054)
>    at 
> org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
>    at 
> org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
>    at 
> org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1124)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:146)
>    at 
> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1053)
>    at 
> org.apache.tapestry5.internal.services.ComponentEventRequestHandlerImpl.handle(ComponentEventRequestHandlerImpl.java:81)
>    at 
> org.apache.tapestry5.internal.services.ImmediateActionRenderResponseFilter.handle(ImmediateActionRenderResponseFilter.java:42)
>    at $ComponentEventRequestHandler_46d5fa76be69.handle(Unknown Source)
>    at 
> org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
>    at $ComponentEventRequestHandler_46d5fa76be69.handle(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$41.handle(TapestryModule.java:2476)
>    at $ComponentEventRequestHandler_46d5fa76be69.handle(Unknown Source)
>    at $ComponentEventRequestHandler_46d5fa76bd6e.handle(Unknown Source)
>    at 
> org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
>    at 
> org.apache.tapestry5.services.InitializeActivePageName.handleComponentEvent(InitializeActivePageName.java:39)
>    at $ComponentRequestHandler_46d5fa76bd70.handleComponentEvent(Unknown 
> Source)
>    at $ComponentRequestHandler_46d5fa76bd68.handleComponentEvent(Unknown 
> Source)
>    at 
> org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:46)
>    at $Dispatcher_46d5fa76bd6b.dispatch(Unknown Source)
>    at $Dispatcher_46d5fa76bd65.dispatch(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
>    at 
> org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at 
> org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at com.example.pms.services.PmsModule$1.service(PmsModule.java:143)
>    at $RequestFilter_46d5fa76bd60.service(Unknown Source)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at 
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:105)
>    at 
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:95)
>    at 
> org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
>    at 
> org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:119)
>    at $RequestHandler_46d5fa76bd66.service(Unknown Source)
>    at $RequestHandler_46d5fa76bd59.service(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
>    at 
> org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
>    at $HttpServletRequestHandler_46d5fa76bd5b.service(Unknown Source)
>    at 
> org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
>    at $HttpServletRequestFilter_46d5fa76bd57.service(Unknown Source)
>    at $HttpServletRequestHandler_46d5fa76bd5b.service(Unknown Source)
>    at 
> org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
>    at $HttpServletRequestHandler_46d5fa76bd5b.service(Unknown Source)
>    at $HttpServletRequestHandler_46d5fa76bd56.service(Unknown Source)
>    at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
>    at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
>    at 
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>    at org.mortbay.jetty.Server.handle(Server.java:326)
>    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>    at 
> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
>    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
>    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
>    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>    at 
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>    at 
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> 
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