[MYFACES-4585] Facelets Compatibility: MethodNotFoundException due to wrong type

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.0.0
• Component/s: General
• Environment: primefaces-test project, jakarta branch
• Assignee: Unassigned
• Reporter: Manuel K
• Created: 06/Mar/23 12:27
• Updated: 17/Apr/23 11:14

Description

When an object is passed through several layers of components, the type somehow gets lost and the expression evaluation uses the wrong type for a method call.

Taglib component, where converter is of type java.faces.convert.Converter:

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

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
                xmlns:p="http://primefaces.org/ui"
                xmlns:o="http://omnifaces.org/ui">

    <!--@elvariable id="value" type="java.lang.Object"-->
    <!--@elvariable id="converter" type="java.faces.convert.Converter"-->
    <!--@elvariable id="readonly" type="java.lang.Boolean"-->
    <!--@elvariable id="readonlyValue" type="java.lang.String"-->

    <o:tagAttribute name="value"
                    default=""/>
    <o:tagAttribute name="converter"
                    default=""/>

    <div>
        <p:autoComplete id="input"
                        value="#{value}"
                        var="item"
                        converter="#{converter}"
                        completeMethod="#{converter.suggest}"
                        itemValue="#{item}"
                        itemLabel="#{converter.getDisplayValue(item)}">

            <ui:insert name="autoCompleteChildren"/>

        </p:autoComplete>

    </div>

</ui:composition>

The method call somehow assumes a String, so the following exception is thrown:

jakarta.el.MethodNotFoundException: Method not found: class java.lang.String.getDisplayValue(java.lang.String) 

I have created a reproducer here: https://github.com/mkomko/primefaces-test/tree/expression-error-method-not-found

The AutoComplete component should work and render results as follows:

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!