Is it possible to use template with composite component in JSF 2?

Answer 1

This will indeed not work. You need <ui:decorate> inside the implementation instead.

<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>
        <ui:decorate template="/WEB-INF/inputLayout.xhtml">
            <ui:define name="content">
                ...
            </ui:define>
        </ui:decorate>
    </cc:implementation>
</ui:component>