[MYFACES-3613] NPE in composite component when ActionListener is missing in the source

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.8
• Fix Version/s: 2.0.16, 2.1.10
• Environment: Java 1.7_05 Win32, Servlet3.0, Jetty8.1.5.v20120716
• Assignee: Leonardo Uribe
• Reporter: marco fago
• Created: 21/Sep/12 11:44
• Updated: 20/Nov/12 23:44
• Resolved: 07/Oct/12 22:46

Description

Consider the following component (simpleCommandButton.xhtml)

<ui:component xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns="http://primefaces.org/ui"
xmlns:cc="http://java.sun.com/jsf/composite"
>

<cc:interface>
<cc:attribute name="action"/>
<cc:attribute name="actionListener"/>
<cc:attribute name="value"/>
</cc:interface>
<cc:implementation>
<h:commandButton value="#

{cc.attrs.value}

" action="#

{cc.attrs.action}

" actionListener="#

{cc.attrs.actionListener}

" immediate="true">
<cc:insertChildren/>
</h:commandButton>
</cc:implementation>
</ui:component>

And in your page:
<myLib::simpleCommandButton value="Test" action="exit"/>

When clicking on the button a NPE occurs:

java.lang.NullPointerException
at org.apache.myfaces.view.facelets.el.ValueExpressionMethodExpression.invoke(ValueExpressionMethodExpression.java:68)
at org.apache.myfaces.view.facelets.el.ContextAwareTagMethodExpression.invoke(ContextAwareTagMethodExpression.java:96)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:83)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:51)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:418)
at javax.faces.component.UICommand.broadcast(UICommand.java:103)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1028)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:286)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1375)
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:759)
at org.springframework.faces.webflow.FlowLifecycle.invokePhase(FlowLifecycle.java:118)
at org.springframework.faces.webflow.FlowLifecycle.execute(FlowLifecycle.java:70)
at org.springframework.faces.webflow.JsfView.processUserEvent(JsfView.java:120)
at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:226)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:196)
at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
at org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:643)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1331)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1302)
at net.sf.ehcache.constructs.web.filter.GzipFilter.doFilter(GzipFilter.java:95)
at net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1302)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java

probably because of the missing (null) attribute "actionListener" in the source declaration.