1 /* 2 * Copyright (c) 2016, 2017, 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 24 /* 25 * @test 26 * @summary Ensure module information is cleaned when owning class loader unloads 27 * @modules java.base/jdk.internal.misc 28 * @library /test/lib .. 29 * @build sun.hotspot.WhiteBox 30 * @compile/module=java.base java/lang/reflect/ModuleHelper.java 31 * @run main ClassFileInstaller sun.hotspot.WhiteBox 32 * sun.hotspot.WhiteBox$WhiteBoxPermission 33 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx64m -Xmx64m LoadUnloadModuleStress 15000 34 */ 35 36 import java.lang.ref.WeakReference; 37 38 import static jdk.test.lib.Asserts.*; 39 40 public class LoadUnloadModuleStress { 41 private static long timeout; 42 private static long timeStamp; 43 44 public static byte[] garbage; 45 public static volatile WeakReference<MyClassLoader> clweak; 46 47 public static Object createModule() throws Throwable { 48 MyClassLoader cl = new MyClassLoader(); 49 Object module = ModuleHelper.ModuleObject("mymodule", cl, new String [] {"PackageA"}); 50 assertNotNull(module); 51 ModuleHelper.DefineModule(module, false, "9.0", "mymodule", new String[] { "PackageA" }); 52 clweak = new WeakReference<>(cl); 53 return module; 54 } 55 56 public static void main(String args[]) throws Throwable { 57 timeout = Long.valueOf(args[0]); 58 timeStamp = System.currentTimeMillis(); 59 60 while(System.currentTimeMillis() - timeStamp < timeout) { 61 WeakReference<Object> modweak = new WeakReference<>(createModule()); 62 63 while(clweak.get() != null) { 64 garbage = new byte[8192]; 65 System.gc(); 66 } 67 assertNull(modweak.get()); 68 } 69 } 70 static class MyClassLoader extends ClassLoader { } 71 }