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

["Johannes Grimm (JIRA)" <de...@myfaces.apache.org>]

Johannes Grimm created MYFACES-4023:
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             Summary: 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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