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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