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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
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 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package com.sun.faces.facelets.compiler;


import com.sun.faces.renderkit.RenderKitUtils;
import com.sun.faces.util.MessageUtils;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import java.io.IOException;
import java.util.List;

final class EndElementInstruction implements Instruction {

    private static final String HEAD_ELEMENT = "head";
    private static final String BODY_ELEMENT = "body";

    private final String element;

    public EndElementInstruction(String element) {
        this.element = element;
    }

    public void write(FacesContext context) throws IOException {
        if (HEAD_ELEMENT.equalsIgnoreCase(this.element)) {
            warnUnhandledResources(context, HEAD_ELEMENT);
        }
        if (BODY_ELEMENT.equalsIgnoreCase(this.element)) {
            warnUnhandledResources(context, BODY_ELEMENT);
            RenderKitUtils.renderUnhandledMessages(context);
        }
        context.getResponseWriter().endElement(this.element);
    }

    public Instruction apply(ExpressionFactory factory, ELContext ctx) {
        return this;
    }

    public boolean isLiteral() {
        return true;
    }


    // --------------------------------------------------------- Private Methods

    private void warnUnhandledResources(FacesContext ctx, String target) {

        UIViewRoot root = ctx.getViewRoot();
        if (root != null) {
            List headResources =
                  root.getComponentResources(ctx, target);
            if (headResources != null && !headResources.isEmpty()) {
                FacesMessage m =
                      MessageUtils.getExceptionMessage(MessageUtils.NO_RESOURCE_TARGET_AVAILABLE,
                                                       target);
                ctx.addMessage(null, m);
            }
        }

    }
}