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https://issues.apache.org/jira/browse/MYFACES-3617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464997#comment-13464997
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Paul Nicolucci commented on MYFACES-3617:
-----------------------------------------
Ok I'll get a patch together. Thanks for the help Leonardo.
> NullPointerException occurs when using an EL Expression in f:viewParam name
> attribute
> -------------------------------------------------------------------------------------
>
> Key: MYFACES-3617
> URL: https://issues.apache.org/jira/browse/MYFACES-3617
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.0.15
> Environment: WebSphere Application Server 8.0 using MyFaces 2.0.15
> Reporter: Paul Nicolucci
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> When using a f:viewParm on a page and using an EL Expression in the name
> attribute of the f:viewParm the following NullPointerException occurs:
> java.lang.NullPointerException
> at
> org.apache.myfaces.util.AbstractAttributeMap.get(AbstractAttributeMap.java:94)
> at javax.faces.component.UIViewParameter.decode(UIViewParameter.java:84)
> at
> javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1377)
> at javax.faces.component.UIInput.processDecodes(UIInput.java:188)
> at
> javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1371)
> at
> javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1365)
> at
> javax.faces.component.UIViewRoot._processDecodesDefault(UIViewRoot.java:1406)
> at javax.faces.component.UIViewRoot.access$400(UIViewRoot.java:74)
> at
> javax.faces.component.UIViewRoot$ApplyRequestValuesPhaseProcessor.process(UIViewRoot.java:1497)
> at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1372)
> at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:759)
> at
> org.apache.myfaces.lifecycle.ApplyRequestValuesExecutor.execute(ApplyRequestValuesExecutor.java:38)
> at
> org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
> at
> org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
> For example the following will work:
> <f:viewParam name="firstName" value="#{userBean.user.firstName}" />
> but this would fail:
> <f:viewParam name="#{userBean.paramName1}" value="#{userBean.user.firstName}"
> />
> I'm willing to code up a fix for this issue, but I need a bit of help
> figuring out where the fix needs to go. It seems the EL expression works
> fine in the value attribute just not in the name attribute. However
> according to the JavaDocs name can be an EL Expression.
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