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. -- View this message in context: http://old.nabble.com/composite-component-with-a-method-expression-throws-NPE-when-used-inside-a-datatable-tp31050301p31050301.html Sent from the MyFaces - Users mailing list archive at Nabble.com.
