This is caused by a bug which was introduced in Mojarra 2.1.8, continued in 2.1.9 and is fixed in 2.1.10. This bug causes that composite component's own XML namespace cannot be declared in a root XML element like <ui:component>/<ui:composition>/<html>/etc as follows:
<ui:component
xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:cc="http://java.sun.com/jsf/composite"
xmlns:my="http://java.sun.com/jsf/composite/mycomponents"
>
<cc:interface>
...
</cc:interface>
<cc:implementation>
<my:foo />
</cc:implementation>
</ui:component>
This would result in the following exception when you attempt to nest <my:foo> inside the <cc:implementation>.
<my:foo> Tag Library supports namespace: http://java.sun.com/jsf/composite/mycomponents, but no tag was defined for name: foo
The current workaround, apart from downgrading to 2.1.7 and waiting for 2.1.10 to be released, is to move the XML namespace declaration into the <cc:implementation>.
<ui:component
xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:cc="http://java.sun.com/jsf/composite"
>
<cc:interface>
...
</cc:interface>
<cc:implementation xmlns:my="http://java.sun.com/jsf/composite/mycomponents">
<my:foo />
</cc:implementation>
</ui:component>
See also:
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