[MYFACES-3978] NullPointerException in FaceletStateValueExpression when ViewPooling enabled

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.2.7
• Fix Version/s: 2.2.9
• Component/s: General
• Assignee: Leonardo Uribe
• Reporter: Chris Kulinski
• Created: 06/Apr/15 19:42
• Updated: 23/Nov/15 21:18
• Resolved: 10/Jul/15 23:37

Description

There's a NullPointerException in FaceletStateValueExpression.getValue() when using ViewPooling under a specific scenario. Its triggered during an AJAX post-back when we provide a CDI bean as a ui:param into a ui:include via an EL lookup. This pattern works correctly when view pooling is disabled.

Here's a example snippet of what triggers the issue.

Snippet from the main page:

<ui:include src="includedAjax.xhtml">
<ui:param name="controller" value="#

{helloCdiTwoViewScopedBean}

"/>
</ui:include>

The component referenced from the <ui:include>:

<h:form id="jsfcdiviewViewScoped">
<h:inputText id="name" value="#

{controller.name}

"></h:inputText>
<h:commandButton value="Welcome Me">
<f:ajax execute="@form" render="output"/>
</h:commandButton>

<h2><h:outputText id="output" value="#

{controller.sayWelcome}

" /></h2>
view:#

{view}

viewScope:#

{viewScope}

</h:form>

The NullPointerException stack trace is listed below. A simple example to recreate will also be attached.

2015-04-06 15:30:11,812 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) Start Phase RESTORE_VIEW(1)
2015-04-06 15:30:11,818 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) End Phase RESTORE_VIEW(1)
2015-04-06 15:30:11,818 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) Start Phase APPLY_REQUEST_VALUES(2)
2015-04-06 15:30:11,822 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) End Phase APPLY_REQUEST_VALUES(2)
2015-04-06 15:30:11,822 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) Start Phase PROCESS_VALIDATIONS(3)
2015-04-06 15:30:11,824 DEBUG [com.autotrader.enterprise.common.context.LogPhaseListener] (default task-4) End Phase PROCESS_VALIDATIONS(3)
2015-04-06 15:30:11,826 ERROR [com.autotrader.enterprise.common.exception.AtExceptionHandler] (default task-4) Error occurred on page: http://taxi49003.autotrader.com:8400/examples/ajaxsamples/helloAjaxInclude.xhtml for ip address: 10.102.113.33 and sessionid: vlQO1yZzubh1-z23UF9S7YUz: java.lang.NullPointerException
at org.apache.myfaces.view.facelets.el.FaceletStateValueExpression.getValue(FaceletStateValueExpression.java:107) [myfaces-impl-2.2.7.jar:2.2.7]
at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:112) [javax.el-3.0.1-b05.jar:]
at com.sun.el.parser.AstValue.getBase(AstValue.java:151) [javax.el-3.0.1-b05.jar:]
at com.sun.el.parser.AstValue.getTarget(AstValue.java:170) [javax.el-3.0.1-b05.jar:]
at com.sun.el.parser.AstValue.getType(AstValue.java:86) [javax.el-3.0.1-b05.jar:]
at com.sun.el.ValueExpressionImpl.getType(ValueExpressionImpl.java:201) [javax.el-3.0.1-b05.jar:]
at org.jboss.weld.el.WeldValueExpression.getType(WeldValueExpression.java:93) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at org.jboss.weld.el.WeldValueExpression.getType(WeldValueExpression.java:93) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getType(ContextAwareTagValueExpression.java:75) [myfaces-impl-2.2.7.jar:2.2.7]
at org.apache.myfaces.shared.renderkit._SharedRendererUtils.findUIOutputConverter(_SharedRendererUtils.java:78) [myfaces-impl-2.2.7.jar:2.2.7]
at org.apache.myfaces.shared.renderkit.RendererUtils.findUIOutputConverter(RendererUtils.java:543) [myfaces-impl-2.2.7.jar:2.2.7]
at org.apache.myfaces.shared.renderkit.RendererUtils.getConvertedUIOutputValue(RendererUtils.java:1004) [myfaces-impl-2.2.7.jar:2.2.7]
at org.apache.myfaces.shared.renderkit.html.HtmlTextRendererBase.getConvertedValue(HtmlTextRendererBase.java:356) [myfaces-impl-2.2.7.jar:2.2.7]
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:662) [myfaces-api-2.2.7.jar:2.2.7]
at javax.faces.component.UIInput.validate(UIInput.java:598) [myfaces-api-2.2.7.jar:2.2.7]
at javax.faces.component.UIInput.processValidators(UIInput.java:274) [myfaces-api-2.2.7.jar:2.2.7]
at javax.faces.component.UIForm.processValidators(UIForm.java:210) [myfaces-api-2.2.7.jar:2.2.7]
at org.apache.myfaces.context.servlet.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:776) [myfaces-impl-2.2.7.jar:2.2.7]
at org.apache.myfaces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:213) [myfaces-impl-2.2.7.jar:2.2.7]
at javax.faces.component.UIForm.visitTree(UIForm.java:314) [myfaces-api-2.2.7.jar:2.2.7]