/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.io.IOException;import java.net.URL;import java.net.MalformedURLException;import java.lang.reflect.InvocationTargetException;/** * Runs a jar application from any url. Usage is 'java JarRunner url [args..]' * where url is the url of the jar file and args is optional arguments to * be passed to the application's main method. */public class JarRunner {    public static void main(String[] args) {        if (args.length < 1) {            usage();        }        URL url = null;        try {            url = new URL(args[0]);        } catch (MalformedURLException e) {            fatal("Invalid URL: " + args[0]);        }        // Create the class loader for the application jar file        JarClassLoader cl = new JarClassLoader(url);        // Get the application's main class name        String name = null;        try {            name = cl.getMainClassName();        } catch (IOException e) {            System.err.println("I/O error while loading JAR file:");            e.printStackTrace();            System.exit(1);        }        if (name == null) {            fatal("Specified jar file does not contain a 'Main-Class'" +                  " manifest attribute");        }        // Get arguments for the application        String[] newArgs = new String[args.length - 1];        System.arraycopy(args, 1, newArgs, 0, newArgs.length);        // Invoke application's main class        try {            cl.invokeClass(name, newArgs);        } catch (ClassNotFoundException e) {            fatal("Class not found: " + name);        } catch (NoSuchMethodException e) {            fatal("Class does not define a 'main' method: " + name);        } catch (InvocationTargetException e) {            e.getTargetException().printStackTrace();            System.exit(1);        }    }    private static void fatal(String s) {        System.err.println(s);        System.exit(1);    }    private static void usage() {        fatal("Usage: java JarRunner url [args..]");    }}