[jira] [Commented] (MYFACES-4023) NullPointerException accessing an attribute of a component within c:forEach and partial state saving activated

["Hank Ibell (JIRA)" <de...@myfaces.apache.org>]

    [ https://issues.apache.org/jira/browse/MYFACES-4023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15048084#comment-15048084 ] 

Hank Ibell commented on MYFACES-4023:
-------------------------------------

MYFACES-3964 (revision 1670492) looks to be the cause of this issue. I reverted the changes to ForEachHandler with revision 1670492, and the NullPointerException no longer occurs.

More investigation is needed.

> NullPointerException accessing an attribute of a component within c:forEach and partial state saving activated
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: MYFACES-4023
>                 URL: https://issues.apache.org/jira/browse/MYFACES-4023
>             Project: MyFaces Core
>          Issue Type: Bug
>    Affects Versions: 2.2.10-SNAPSHOT
>            Reporter: Johannes Grimm
>
> Accessing an attribute from with in a composite component that is contained in a forEach tag causes a null pointer exception if partial state saving is enabled.
> As the example is too complex to be shown within this report an example project can be found at https://github.com/jgrimmwsb/faces-foreach-partial-state-saving.
> Steps to reproduce the error:
> # Ensure the selected {{myfaces.version}} in the {{pom.xml}} is one of *2.2.10-SNAPSHOT*.
> # Ensure that {{javax.faces.PARTIAL_STATE_SAVING}} is set to *true* in the {{web.xml}}.
> # Start the application and open the respective website.
> # The log will show an exception like shown below:
> {code:title=Stacktrace}
> java.lang.NullPointerException
> 	at org.apache.myfaces.view.facelets.el.FaceletStateValueExpression.getWrapped(FaceletStateValueExpression.java:75)
> 	at org.apache.myfaces.view.facelets.el.FaceletStateValueExpression.getValue(FaceletStateValueExpression.java:107)
> 	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:74)
> 	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
> 	at org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(ContextAwareTagValueExpression.java:96)
> 	at javax.faces.component._ComponentAttributesMap.get(_ComponentAttributesMap.java:331)
> 	at example.Test.getVariables(Test.java:161)
> 	at example.Test.captureOriginalVars(Test.java:133)
> 	at example.Test.visitTree(Test.java:77)
> 	at javax.faces.component.UIForm.visitTree(UIForm.java:345)
> 	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
> 	at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:1191)
> {code}
> With _MyFaces 2.2.7_ or _Mojarra_ the error did not occur. _MyFaces 2.2.10-SNAPSHOT_ with {{javax.faces.PARTIAL_STATE_SAVING}} is set to *false* works without error.



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