NullPointerException is thrown when eventProducer attribute is added to <a4j:push> component.

Solution Verified - Updated -

Issue

  • NullPointerException is thrown when eventProducer attribute is added to <a4j:push> component.  When running on the server it produces the following exception:

    SEVERE [viewhandler] Error Rendering View[/pages/push.xhtml]
java.lang.NullPointerException
 at org.ajax4jsf.component.UIPush.getListener(UIPush.java:64)
 at org.ajax4jsf.component.UIPush.encodeBegin(UIPush.java:57)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928)
 at javax.faces.render.Renderer.encodeChildren(Renderer.java:148)
 at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
 at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
 at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
 at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
 at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
...

Environment

  • JBoss Enterprise Application Platform (EAP) 5
  • RichFaces

  • Code that appears to trigger the issue, If the attribute eventProducer="#{dataBean.addListener}" is removed, the page runs correctly:

    <h:form id="dataForm">
    <a4j:push enabled="#{dataBean.enabled}" interval="2000"
        timeout="3000" id="push" eventProducer="#{dataBean.addListener}"
        limitToList="true"
        reRender="push, tempResults, start, stop" data="#{dataBean.values}"/>
</h:form>

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