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https://issues.apache.org/jira/browse/MYFACES-4431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17515675#comment-17515675
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Volodymyr Siedlecki commented on MYFACES-4431:
----------------------------------------------
I've created an sample app demonstrating the issue here:
[https://github.com/volosied/MYFACES-4431] (run on java 8)
My proposed solution is to return if flowNavigationStructure is null? That
seems enough (without causing regressions).
[https://github.com/apache/myfaces/pull/238] Thoughts?
Also, I looked at Mojarra, and it doesn't exhibit this NPE as their
implementation is different from ours.
> Custom Navigation Handler Thows NPE during Flow Handling
> --------------------------------------------------------
>
> Key: MYFACES-4431
> URL: https://issues.apache.org/jira/browse/MYFACES-4431
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-344, JSR-372
> Reporter: Volodymyr Siedlecki
> Priority: Major
>
> When entering a flow while using a custom navigation handler, the following
> NPE occur:
> {quote}java.lang.NullPointerException
> org.apache.myfaces.application.NavigationHandlerImpl.getNavigationCaseFromFlowStructure(NavigationHandlerImpl.java:958)
>
> org.apache.myfaces.application.NavigationHandlerImpl.getNavigationCommand(NavigationHandlerImpl.java:773)
>
> org.apache.myfaces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:133)
>
> org.apache.myfaces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:121)
>
> org.primefaces.application.DialogNavigationHandler.handleNavigation(DialogNavigationHandler.java:113)
>
> org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:140)
>
> org.primefaces.application.DialogActionListener.processAction(DialogActionListener.java:54)
> javax.faces.component.UICommand.broadcast(UICommand.java:120)
> javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1255)
> javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:420)
> javax.faces.component.UIViewRoot._process(UIViewRoot.java:1741)
> javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:935)
> org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:42)
>
> org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:195)
> org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:142)
> javax.faces.webapp.FacesServlet.service(FacesServlet.java:204)
> {quote}
> My testing used the "org.primefaces.application.DialogNavigationHandler"
> ([link|https://github.com/primefaces/primefaces/blob/8.0/src/main/java/org/primefaces/application/DialogNavigationHandler.java])
> from PrimeFaces.
> ______
> Typically, the Flow navigations would be added here in
> NavigationHandlerImpl#inspectFlow:
> [https://github.com/apache/myfaces/blob/2.3.x/impl/src/main/java/org/apache/myfaces/application/NavigationHandlerImpl.java#L1490-L1492]
> However, since DialogNavigationHandler is a sub class of
> ConfigurableNavigationHandler, the inspectFlow (empty method) is called on
> the super class instead. See methods here:
> [https://github.com/apache/myfaces/blob/2.3.x/impl/src/main/java/org/apache/myfaces/flow/FlowHandlerImpl.java#L784]
> [https://github.com/apache/myfaces/blob/2.3.x/api/src/main/java/javax/faces/application/ConfigurableNavigationHandler.java#L54]
> Since _flowNavigationStructureMap is empty, an null (from the get call) is
> passed into getNavigationCaseFromFlowStructure which causes the NPE.
> [https://github.com/apache/myfaces/blob/2.3.x/impl/src/main/java/org/apache/myfaces/application/NavigationHandlerImpl.java#L771-L774]
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