If I pass an expression to a composite component like
<My:myButton action="#{bean.myaction()" value="#{bean.buttText()}"
and try to use it in
<cc:implementation>
<h:commandButton actionListener="#{cc.attrs.action} value="#{cc.attrs.value}...
I get the exception "Target Unreachable, identifier 'bean' resolved to null".
But only if bean is a <ui:param name="bean" value="#{myRealBean}"/> inside a template. The error only occours with actionListener. The button text, resolved from the same bean in the same way will be shown.
This old question seems to have the same problem but no answer.
If I split the parameter to
<My:myButton bean="#{bean}" method="myaction" value="#{bean.buttText()}"
and use
<cc:implementation>
<h:commandButton actionListener="#{cc.attrs.bean[cc.attrs.method]()} ...
no error occours and everything works fine.
How can I use a function-expression in an actionListener inside a composite component, where the bean is a <ui:param?
Glassfish 4.1.1, Mojarra 2.2.12
And now, the MCVE
a bean:
package beans;
import java.io.Serializable;
import javax.faces.view.ViewScoped;
import javax.inject.Named;
@Named
@ViewScoped
public class Testbean implements Serializable {
public String getButtText() { return "Submit"; }
public void doAction() { System.out.println("Ajax was here."); }
}
a page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://xmlns.jcp.org/jsf/facelets" xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:ST="http://java.sun.com/jsf/composite/softeam" >
<h:head>
</h:head>
<h:body>
<h:form id="testform">
<h:panelGrid columns="1">
<ui:include src="testtemplate.xhtml">
<ui:param name="bean" value="#{testbean}"/>
</ui:include>
<ST:testButt text="#{testbean.buttText}" action="#{testbean.doAction()}"/>
<h:commandButton value="#{testbean.buttText}" actionListener="#{testbean.doAction()}"/>
</h:panelGrid>
</h:form>
</h:body>
</html>
and a template
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:ST="http://java.sun.com/jsf/composite/softeam">
<ST:testButt text="#{bean.buttText}" action="#{bean.doAction()}"/>
<h:commandButton value="#{bean.buttText}" action="#{bean.doAction()}" />
</ui:composition>
and the component
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:S="http://xmlns.jcp.org/jsf/composite" >
<S:interface>
<S:attribute name="action" method-signature="void action()"/>
<S:attribute name="text" type="java.lang.String"/>
</S:interface>
<S:implementation>
<h:commandButton style="display:inline-block"
value="#{cc.attrs.text}"
actionListener="#{cc.attrs.action}"
/>
</S:implementation>
</html>
All buttons will be shown (with the bean.buttText()) but only the second, third and fourth will call the action. The first button throws an exception when clicked.
Edit: Example reduced to JSF, no PrimeFaces components.
