1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 import java.io.File;

    24 import java.io.PrintStream;

    25 import java.lang.instrument.Instrumentation;

    26 import java.util.Arrays;

    27 

    28 public class Agent {

    29     public static void main(String[] args) throws Exception {

    30         String jarName = args[0];

    31         String className = args[1];

    32         String manifestName = "manifest.mf";

    33 

    34         System.out.println("Creating "+manifestName);

    35         try (PrintStream out = new PrintStream(new File(manifestName))) {

    36             out.println("Premain-Class: " + className);

    37             out.println("Can-Redefine-Classes: true");

    38         }

    39         System.out.println("Building "+jarName);

    40         String[] jarArgs = new String[] {"-cfm", jarName, manifestName };

    41 

    42         System.out.println("Running jar " + Arrays.toString(jarArgs));

    43         sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");

    44         if (!jarTool.run(jarArgs)) {

    45             throw new Error("jar failed: args=" + Arrays.toString(args));

    46         }

    47     }

    48 }