How to use Facelets composition with files from another context

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Note that this is to be done differently in JSF 2.x Facelets, see this answer for detail.

This is possible with a custom Facelets resource resolver. I would only not resolve them by HTTP, but just from the classpath. Just package the shared templates in for example the /META-INF/resources folder of the JAR file and drop the resolver class in the same JAR. Finally distribute this JAR among all webapps.

package com.example;

import java.net.URL;

import com.sun.facelets.impl.DefaultResourceResolver;

public class FaceletsResourceResolver extends DefaultResourceResolver {

    private String basePath;

    public FaceletsResourceResolver() {
        this.basePath = "/META-INF/resources"; // TODO: Make configureable?
    }

    public URL resolveUrl(String path) {
        URL url = super.resolveUrl(path); // Resolves from WAR.

        if (url == null) {
            url = getClass().getResource(basePath + path); // Resolves from JAR.
        }

        return url;
    }

}

Register it in web.xml as follows:

<context-param>
    <param-name>facelets.RESOURCE_RESOLVER</param-name>
    <param-value>com.example.FaceletsResourceResolver</param-value>
</context-param>

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