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 /* @test
  25  * @bug 7142035
  26  * @summary Assert in java.lang.instrument agents during shutdown when classloading occurs after shutdown
  27  * @library /lib/testlibrary
  28  *
  29  * @modules java.instrument
  30  *          java.management
  31  * @build jdk.testlibrary.* DummyAgent DummyClass TestDaemonThreadLauncher TestDaemonThread
  32  * @run shell ../MakeJAR3.sh DummyAgent
  33  * @run main/timeout=240 TestDaemonThreadLauncher
  34  *
  35  */
  36 import java.io.File;
  37 import java.net.URL;
  38 import java.net.URLClassLoader;
  39 
  40 public class TestDaemonThread implements Runnable{
  41     File classpath;
  42 
  43     public TestDaemonThread(File classpath) {
  44         this.classpath = classpath;
  45     }
  46 
  47     @Override
  48     public void run() {
  49 
  50 
  51         try {
  52             URL u = this.getClass().getClassLoader().getResource("DummyClass.class");
  53             String path = u.getPath();
  54             String parent = u.getPath().substring(0, path.lastIndexOf('/')+1);
  55             URL parentURL = new URL(u, parent);
  56             System.out.println(parentURL);
  57             /* Load lots of class by creating multiple classloaders */
  58             for(;;) {
  59                 ClassLoader cl = new URLClassLoader(new URL[] {parentURL}, null);
  60                 cl.loadClass("DummyClass");
  61             }
  62         } catch (Exception e) {
  63             e.printStackTrace();
  64         }
  65     }
  66 
  67     public static void main(String[] args) throws Exception {
  68            Thread t = new Thread(new TestDaemonThread(new File(args[0])));
  69            /* The important part of the bug is that a Daemon thread can continue to load classes after shutdown */
  70            t.setDaemon(true);
  71            t.start();
  72            Thread.sleep(200);
  73     }
  74 }