Glassfish example source code file (Tool.java)

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Java - Glassfish tags/keywords

arraylist, arraylist, class, classloader, constructing, exception, file, file, io, log, logging, object, reflection, string, string, throwable, throwable, tool, util

The Glassfish Tool.java source code

/*
 * 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.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * recipient has the option to distribute your version of this file under
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.startup;


import java.io.File;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 * <p>General purpose wrapper for command line tools that should execute in an
 * environment with the common class loader environment set up by Catalina.
 * This should be executed from a command line script that conforms to
 * the following requirements:</p>
 * <ul>
 * <li>Passes the catalina.home system property configured with
 *     the pathname of the Tomcat installation directory.</li>
 * <li>Sets the system classpath to include bootstrap.jar and
 *     <code>$JAVA_HOME/lib/tools.jar.
 * </ul>
 *
 * <p>The command line to execute the tool looks like:

 * <pre>
 *   java -classpath $CLASSPATH org.apache.catalina.startup.Tool \
 *     ${options} ${classname} ${arguments}
 * </pre>
 *
 * <p>with the following replacement contents:
 * <ul>
 * <li>${options} - Command line options for this Tool wrapper.
 *     The following options are supported:
 *     <ul>
 *     <li>-ant : Set the ant.home system property
 *         to corresponding to the value of <code>catalina.home
 *         (useful when your command line tool runs Ant).</li>
 *     <li>-common : Add common/classes and
 *         <code>common/lib
 *     <li>-debug : Enable debugging messages from this wrapper.
 *     <li>-server : Add server/classes and
 *         <code>server/lib to the class loader repositories.
 *     <li>-shared : Add shared/classes and
 *         <code>shared/lib to the class loader repositories.
 *     </ul>
 * <li>${classname} - Fully qualified Java class name of the
 *     application's main class.</li>
 * <li>${arguments} - Command line arguments to be passed to
 *     the application's <code>main() method.
 * </ul>
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2006/03/12 01:27:07 $
 */

public final class Tool {


    // ------------------------------------------------------- Static Variables

    /**
     * Set <code>ant.home system property?
     */
    private static boolean ant = false;


    /**
     * The pathname of our installation base directory.
     */
    private static String catalinaHome = System.getProperty("catalina.home");


    /**
     * Include common classes in the repositories?
     */
    private static boolean common = false;


    /**
     * Enable debugging detail messages?
     */
    private static boolean debug = false;


    private static Logger log = Logger.getLogger(Tool.class.getName());

    /**
     * Include server classes in the repositories?
     */
    private static boolean server = false;


    /**
     * Include shared classes in the repositories?
     */
    private static boolean shared = false;


    // ----------------------------------------------------------- Main Program


    /**
     * The main program for the bootstrap.
     *
     * @param args Command line arguments to be processed
     */
    public static void main(String args[]) {

        // Verify that "catalina.home" was passed.
        if (catalinaHome == null) {
            log.severe("Must set 'catalina.home' system property");
            System.exit(1);
        }

        // Process command line options
        int index = 0;
        while (true) {
            if (index == args.length) {
                usage();
                System.exit(1);
            }
            if ("-ant".equals(args[index]))
                ant = true;
            else if ("-common".equals(args[index]))
                common = true;
            else if ("-debug".equals(args[index]))
                debug = true;
            else if ("-server".equals(args[index]))
                server = true;
            else if ("-shared".equals(args[index]))
                shared = true;
            else
                break;
            index++;
        }
        if (index > args.length) {
            usage();
            System.exit(1);
        }

        // Set "ant.home" if requested
        if (ant)
            System.setProperty("ant.home", catalinaHome);

        // Construct the class loader we will be using
        ClassLoader classLoader = null;
        try {
            if (log.isLoggable(Level.FINE)) {
                log.fine("Constructing class loader");
                ClassLoaderFactory.setDebug(1);
            }
            ArrayList packed = new ArrayList();
            ArrayList unpacked = new ArrayList();
            unpacked.add(new File(catalinaHome, "classes"));
            packed.add(new File(catalinaHome, "lib"));
            if (common) {
                unpacked.add(new File(catalinaHome,
                                      "common" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "common" + File.separator + "lib"));
            }
            if (server) {
                unpacked.add(new File(catalinaHome,
                                      "server" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "server" + File.separator + "lib"));
            }
            if (shared) {
                unpacked.add(new File(catalinaHome,
                                      "shared" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "shared" + File.separator + "lib"));
            }
            classLoader =
                ClassLoaderFactory.createClassLoader
                ((File[]) unpacked.toArray(new File[0]),
                 (File[]) packed.toArray(new File[0]),
                 null);
        } catch (Throwable t) {
            log.log(Level.SEVERE, "Class loader creation threw exception", t);
            System.exit(1);
        }
        Thread.currentThread().setContextClassLoader(classLoader);

        // Load our application class
        Class clazz = null;
        String className = args[index++];
        try {
            if (log.isLoggable(Level.FINE))
                log.fine("Loading application class " + className);
            clazz = classLoader.loadClass(className);
        } catch (Throwable t) {
            log.log(Level.SEVERE,
                    "Exception creating instance of " + className, t);
            System.exit(1);
        }

        // Locate the static main() method of the application class
        Method method = null;
        String params[] = new String[args.length - index];
        System.arraycopy(args, index, params, 0, params.length);
        try {
            if (log.isLoggable(Level.FINE))
                log.fine("Identifying main() method");
            String methodName = "main";
            Class paramTypes[] = new Class[1];
            paramTypes[0] = params.getClass();
            method = clazz.getMethod(methodName, paramTypes);
        } catch (Throwable t) {
            log.log(Level.SEVERE, "Exception locating main() method", t);
            System.exit(1);
        }

        // Invoke the main method of the application class
        try {
            if (log.isLoggable(Level.FINE))
                log.fine("Calling main() method");
            Object paramValues[] = new Object[1];
            paramValues[0] = params;
            method.invoke(null, paramValues);
        } catch (Throwable t) {
            log.log(Level.SEVERE, "Exception calling main() method", t);
            System.exit(1);
        }

    }


    /**
     * Display usage information about this tool.
     */
    private static void usage() {

        log.info("Usage:  java org.apache.catalina.startup.Tool [<options>]  []");

    }


}