[MYFACES-3942] <f:viewParam binding> causes NPE because UIViewRoot is null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.6
• Fix Version/s: 2.2.7
• Environment: Tomcat 8.0.14 and TomEE 2.0.0 snapshot.
• Assignee: Leonardo Uribe
• Reporter: Bauke Scholtz
• Created: 19/Nov/14 07:46
• Updated: 17/Dec/14 13:59
• Resolved: 24/Nov/14 21:43

Description

Using binding attribute on <f:viewParam> as follows:

<f:viewParam name="foo" binding="#{foo}" />

causes regardless of the binding location (Facelet itself as demonstrated above, request scoped bean, session scoped bean, etc) the following exception:

java.lang.NullPointerException
	at org.apache.myfaces.view.facelets.tag.jsf.ComponentTagHandlerDelegate.createComponent(ComponentTagHandlerDelegate.java:534)
	at org.apache.myfaces.view.facelets.tag.jsf.ComponentTagHandlerDelegate.apply(ComponentTagHandlerDelegate.java:284)
	at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:50)
	at org.apache.myfaces.view.facelets.tag.jsf.core.ViewMetadataHandler.apply(ViewMetadataHandler.java:85)
	at org.apache.myfaces.view.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:195)
	at org.apache.myfaces.view.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:59)
	at org.apache.myfaces.view.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:48)
	at org.apache.myfaces.view.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:188)
	at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage$FaceletViewMetadata.createMetadataView(FaceletViewDeclarationLanguage.java:2752)
	at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:255)
	at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:196)
	at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
	... 

Turns out that UIViewRoot is null while the code didn't expect that.