1 /*
   2  * Copyright 2014 Goldman Sachs.
   3  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 /* @test
  26  * @bug 7142035
  27  * @summary Assert in java.lang.instrument agents during shutdown when classloading occurs after shutdown
  28  *
  29  * @library /lib/testlibrary
  30  * @modules java.instrument
  31  *          java.management
  32  *
  33  * @build jdk.testlibrary.* DummyAgent DummyClass TestDaemonThreadLauncher TestDaemonThread
  34  * @run shell ../MakeJAR3.sh DummyAgent
  35  * @run main/timeout=240 TestDaemonThreadLauncher
  36  */
  37 import java.io.File;
  38 import java.net.URL;
  39 import java.net.URLClassLoader;
  40 
  41 public class TestDaemonThread implements Runnable{
  42     File classpath;
  43 
  44     public TestDaemonThread(File classpath) {
  45         this.classpath = classpath;
  46     }
  47 
  48     @Override
  49     public void run() {
  50 
  51 
  52         try {
  53             URL u = this.getClass().getClassLoader().getResource("DummyClass.class");
  54             String path = u.getPath();
  55             String parent = u.getPath().substring(0, path.lastIndexOf('/')+1);
  56             URL parentURL = new URL(u, parent);
  57             System.out.println(parentURL);
  58             /* Load lots of class by creating multiple classloaders */
  59             for(;;) {
  60                 ClassLoader cl = new URLClassLoader(new URL[] {parentURL}, null);
  61                 cl.loadClass("DummyClass");
  62             }
  63         } catch (Exception e) {
  64             e.printStackTrace();
  65         }
  66     }
  67 
  68     public static void main(String[] args) throws Exception {
  69            Thread t = new Thread(new TestDaemonThread(new File(args[0])));
  70            /* The important part of the bug is that a Daemon thread can continue to load classes after shutdown */
  71            t.setDaemon(true);
  72            t.start();
  73            Thread.sleep(200);
  74     }
  75 }