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From Victor Hugo Garcia <victor.gar...@aplicaciones.com.co>
Subject composite component with a method expression throws NPE when used inside a datatable
Date Wed, 02 Mar 2011 15:15:39 GMT

Hi,

I created the following composite component, named imageLink:

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:c="http://java.sun.com/jstl/core"
    xmlns:composite="http://java.sun.com/jsf/composite">

    <composite:interface>
      <composite:attribute name="url" type="String" required="true"/>
      <composite:attribute name="actionMethod" method-signature="String
action()" />
      <composite:attribute name="styleClass" default="image" type="String"/>
      <composite:attribute name="label" type="String"/>
    </composite:interface>

    <composite:implementation>
	    <h:commandLink action="#{cc.attrs.actionMethod}">
			<h:graphicImage url="#{cc.attrs.url}"
styleClass="#{cc.attrs.styleClass}"/>
			<h:outputText value="#{cc.attrs.label}"/>
		</h:commandLink>
    </composite:implementation>

</html>

then i used in a page like this:

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:a="http://java.sun.com/jsf/composite/components/aplica"
    template="/templates/masterLayout.xhtml">

    <ui:define name="links">
         <h:form>
			<a:imageLink url="/images/pdf.png" label="#{bundle.verPDF}"
				actionMethod="#{programaFidelidadBean.verPDF}"/>
			<a:imageLink url="/images/new.png" label="#{bundle.Ingresar}"
				actionMethod="#{programaFidelidadBean.ingresarProgramaFidelidad}"/>
		</h:form>
    </ui:define>

    <ui:define name="title">
	   <h:outputText value="#{bundle.ProgramaFidelidad_lista}"
styleClass="title"/>
    </ui:define> 

    <ui:define name="content">
		<h:form id="programasFidelidadForm">
			<h:dataTable id="programas" 
			  value="#{programaFidelidadListaBean.programasFidelidad}"
			  var="programaFidelidad">
			  	<h:column>
					<a:imageLink url="/images/edit.png" alt="#{bundle.Editar}"
					actionMethod="#{programaFidelidadListaBean.editar}"/>
					<a:imageLink url="/images/clone.png" alt="#{bundle.Clonar}"
					actionMethod="#{programaFidelidadListaBean.clonar}"/>
					<a:imageLink url="/images/pdf.png" alt="#{bundle.Informe}"
					actionMethod="#{programaFidelidadListaBean.verPDF}"/>
				</h:column>
                                <h:column>                                     
                         ...


the links defined in the section "links" works fine, but when i click the
links inside the datable, i get this error: 

	Caused by: java.lang.NullPointerException
	at
org.apache.myfaces.view.facelets.el.ValueExpressionMethodExpression.getExpressionString(ValueExpressionMethodExpression.java:70)
	at
org.apache.myfaces.view.facelets.el.TagMethodExpression.getExpressionString(TagMethodExpression.java:101)
	at
javax.faces.component._MethodExpressionToMethodBinding.getExpressionString(_MethodExpressionToMethodBinding.java:60)
	at
org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:97)
	at javax.faces.component.UICommand.broadcast(UICommand.java:120)
	at javax.faces.component.UIData.broadcast(UIData.java:761)
	at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:969)
	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:275)
	at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1281)
	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:707)
	at
org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:34)
	at
org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
	... 33 more


Thanks for your help,

Victor Garcia.
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