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From "Volker Malzahn (JIRA)" <...@myfaces.apache.org>
Subject [jira] Created: (TRINIDAD-2059) NPE in CoreResponseStateManager._restoreSerializedView
Date Thu, 10 Mar 2011 15:56:00 GMT
NPE in CoreResponseStateManager._restoreSerializedView
------------------------------------------------------

                 Key: TRINIDAD-2059
                 URL: https://issues.apache.org/jira/browse/TRINIDAD-2059
             Project: MyFaces Trinidad
          Issue Type: Bug
          Components: Components
    Affects Versions: 2.0.0-beta-2
         Environment: WinXP, IE 8, Firefox 3.6, Tomcat 5.5, Spring Web Flow 2.3.0, Mojarra
2.0.2-FCS
            Reporter: Volker Malzahn
            Priority: Blocker


When Trinidad runs inside Mojarra and Sping Web Flow (SWF) a Nullpointerexception occurs when
the "redirect after post" GET request is executed:

Caused by: java.lang.NullPointerException
	at java.io.StringReader.<init>(StringReader.java:33)
	at org.apache.myfaces.trinidadinternal.renderkit.core.CoreResponseStateManager._restoreSerializedView(CoreResponseStateManager.java:279)
	at org.apache.myfaces.trinidadinternal.renderkit.core.CoreResponseStateManager.getTreeStructureToRestore(CoreResponseStateManager.java:146)
	at org.apache.myfaces.trinidadinternal.application.StateManagerImpl.restoreView(StateManagerImpl.java:584)
	at org.springframework.faces.webflow.FlowViewStateManager.restoreView(FlowViewStateManager.java:195)
	at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:131)
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:430)
	at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:143)
	at org.springframework.faces.webflow.FlowViewHandler.restoreFlowView(FlowViewHandler.java:144)
	at org.springframework.faces.webflow.FlowViewHandler.restoreView(FlowViewHandler.java:83)
	at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:288)
	at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:242)
	at org.springframework.faces.webflow.FlowViewHandler.restoreFlowView(FlowViewHandler.java:144)
	at org.springframework.faces.webflow.FlowViewHandler.restoreView(FlowViewHandler.java:83)
	at org.springframework.faces.webflow.JsfViewFactory.getView(JsfViewFactory.java:105)
	at org.springframework.webflow.engine.ViewState.resume(ViewState.java:193)
	at org.springframework.webflow.engine.Flow.resume(Flow.java:545)

The reason is that in "String stateString = _getStateString(external);" null is returned (because
the GET request of SWF doesn't contain the request parameter "javax.faces.ViewState").
CoreResponseStateManager._restoreSerializedView should become null save by putting a "if (stateString
!= null) {" before the "StringReader sr = new StringReader(stateString);".

Is it possible to restore the view if we don't have a request parameter "javax.faces.ViewState"
so that the component tree doesn't need to be built again in the GET request when emedded
into SWF?

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