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https://issues.apache.org/jira/browse/MYFACES-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17696993#comment-17696993
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Manuel K commented on MYFACES-4583:
-----------------------------------
Thank you very much for looking into it. That is actually a way better solution
and seems to work fine for us. It still throws an exception on Mojarra, but
that is more a fault on their part I guess. This is how it should work anyway.
You can close the issue as far as I'm concerned, thank you!
> cc.getValueExpression not evaluated correctly
> ---------------------------------------------
>
> Key: MYFACES-4583
> URL: https://issues.apache.org/jira/browse/MYFACES-4583
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 4.0.0-RC5
> Environment: primefaces-test project, jakarta branch
> Reporter: Manuel K
> Priority: Major
> Attachments: image-2023-03-06-10-38-02-649.png
>
>
> 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):
> {code:java}
> <?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>
> {code}
> 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:
> {code:java}
> (Map)this.getStateHelper().get(UIComponent.PropertyKeys.bindings);{code}
> 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:
> !image-2023-03-06-10-38-02-649.png!
> It works using
> {code:java}
> mvn clean jetty:run -Pmojarra40{code}
> but not using
> {code:java}
> mvn clean jetty:run -Pmyfaces40{code}
> Thank you very much in advance for taking a look!
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