Custom taglib results in MethodNotFoundException - jsf-2

Question

What I want to do is declare a common datatable header as a composite component. But this answer set me straight since it was not rendered:
How to create a composite component for a datatable column?
Basically it instructed me to try my own taglib and this works really well except my header has a link in it that does reRender. When this link is pressed MethodNotFoundException is thrown.
This is my custom taglib:
<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
version="2.0">
<namespace>http://stackoverflowdummy.com/dumb/components</namespace>
<tag>
<tag-name>tableHeader</tag-name>
<source>tags/tableHeader.xhtml</source>
<attribute>
<description></description>
<name>value</name>
</attribute>
<attribute>
<description>The listener that handles sorting</description>
<name>sortAction</name>
<method-signature>java.lang.String action()</method-signature>
</attribute>
<attribute>
<description>The property that holds the current id to sort on
</description>
<name>sortValue</name>
</attribute>
<attribute>
<description>The component that needs to be updated after changes
</description>
<name>reRender</name>
</attribute>
</tag>
</facelet-taglib>
I tried without method-signature and I also tried removing "action". My web.xml does include the taglib like this:
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/cc.taglib.xml</param-value>
</context-param>
I also tried with "facelets.LIBRARIES" but it made no difference.
<h:commandLink value="#{o.label}" action="#{sortAction}" immediate="true" reRender="#{reRender}">
<f:setPropertyActionListener target="#{sortValue}" value="#{o.column.sortId}" />
</h:commandLink>
End usage is defined like this:
sortAction="#{myBean.sort}"
That bean has a method called with signature String sort(); and it works really well if I just define it and skip using my own tag. However everything works with the tag except the action method...

Answer 1

The JavaBean Specification gives multiple ways on how to call a method. In fact, you can call a action the normal way #{actionBean.actionMethod}, but also the way #{actionBean['actionMethod']}.
The sorting Action you are giving is transferred as a MethodExpression, which compared to ValueExpressions gave me problems in some JSF Environments.
What I'd like you to try testwise is, to give the action as two separate (value) parameters:
sortActionBean="#{myBean}"
sortActionMethod="sort"
and call those in the template as #{sortActionBean['sortActionMethod']}. A good article on this topic is Passing action methods facelets tags.
Hope it helps...