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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 * Modifications:
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package com.sun.faces.scripting.groovy;

import java.util.logging.Logger;
import java.util.logging.Level;

import com.sun.faces.util.Util;
import com.sun.faces.util.FacesLogger;

/**
 * This class exists to avoid having to have Groovy available at runtime.
 */
public class GroovyHelperFactory {

    private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
    private static final String GROOVY_HELPER_IMPL =
          "com.sun.faces.scripting.groovy.GroovyHelperImpl";

    public static GroovyHelper createHelper() {
        try {
            if (Util.loadClass("groovy.util.GroovyScriptEngine", GroovyHelperFactory.class) != null) {
                try {
                    Class c =
                          Util.loadClass(GROOVY_HELPER_IMPL, GroovyHelperFactory.class);
                    return (GroovyHelper) c.newInstance();
                } catch (UnsupportedOperationException ignored) {
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.fine("Groovy runtime available, but WEB-INF/groovy directory not present."
                                    + "  Groovy support will not be enabled.");
                    }
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.SEVERE)) {
                        LOGGER.log(Level.SEVERE,
                                   "Groovy support not available",
                                   e);
                    }
                }
            }
        } catch (ClassNotFoundException cnfe) {
            if (LOGGER.isLoggable(Level.FINEST)) {
                LOGGER.log(Level.FINEST, "Unable to find class", cnfe);
            }
        }
        return null;
    }
}