[MYFACES-4583] cc.getValueExpression not evaluated correctly

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 4.0.0-RC5
• Component/s: General
• Environment: primefaces-test project, jakarta branch
• Assignee: Unassigned
• Reporter: Manuel K
• Created: 06/Mar/23 09:38
• Updated: 06/Mar/23 15:29
• Resolved: 06/Mar/23 15:29

Description

When having a composite component where cc:getValueExpression is used in a c:if to check if a value has been passed as an attribute, the call does not return the desired result.

This methodology has been suggest by BalusC here: https://stackoverflow.com/a/11368475/10157328

The composite component looks as follows (simplified):

<?xml version="1.0" encoding="UTF-8"?>

<ui:component xmlns="http://www.w3.org/1999/xhtml"
              xmlns:h="http://xmlns.jcp.org/jsf/html"
              xmlns:cc="http://xmlns.jcp.org/jsf/composite"
              xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
              xmlns:f="http://xmlns.jcp.org/jsf/core"
              xmlns:c="http://xmlns.jcp.org/jsp/jstl/core"
              xmlns:p="http://primefaces.org/ui">
    <cc:interface>
        <!-- Edit Menu Item -->
        <cc:attribute name="editValue"
                      default="Edit"/>
        <cc:attribute name="editAction"
                      method-signature="java.lang.String action(java.lang.Object)"/>
    </cc:interface>

    <cc:implementation>

        <p:menuButton id="menubutton"
                      value="Menu">

            <c:if test="#{not empty cc.getValueExpression('editAction')}">
                <p:menuitem id="edit"
                            value="#{cc.attrs.editValue}"
                            action="#{cc.attrs.editAction}"/>
            </c:if>

        </p:menuButton>

    </cc:implementation>
</ui:component>
 

On Mojarra, the if works correctly, while on MyFaces the p:menuitem is never rendered. When debugging, the following expression in the method UIComponent#getValueExpression returns null:

(Map)this.getStateHelper().get(UIComponent.PropertyKeys.bindings);

I have created a reproducer here:

https://github.com/mkomko/primefaces-test/tree/composite-component-get-value-expression

The menu should render a MenuItem like so:

It works using 

mvn clean jetty:run -Pmojarra40

 but not using 

mvn clean jetty:run -Pmyfaces40

Thank you very much in advance for taking a look!