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

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 2.2.10-SNAPSHOT
• Assignee: Leonardo Uribe
• Reporter: Johannes Grimm
• Created: 08/Dec/15 10:16
• Updated: 30/Mar/16 00:04
• Resolved: 13/Feb/16 22:17

Description

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:

1. Ensure the selected myfaces.version in the pom.xml is one of 2.2.10-SNAPSHOT.
2. Ensure that javax.faces.PARTIAL_STATE_SAVING is set to true in the web.xml.
3. Start the application and open the respective website.
4. The log will show an exception like shown below:

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)

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.

Issue Links

• relates to: MYFACES-3964 c:foreach not working when using custom equals or non serializable objects