1/* 2 * Copyright (c) 2016, 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 * @key gc 27 * @bug 8114823 28 * @requires vm.gc == null 29 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 30 * @requires vm.opt.ClassUnloading != true 31 * @library /test/lib 32 * @modules java.base/jdk.internal.misc 33 * java.management 34 * @build sun.hotspot.WhiteBox 35 * @run main ClassFileInstaller sun.hotspot.WhiteBox 36 * sun.hotspot.WhiteBox$WhiteBoxPermission 37 * 38 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 39 * -XX:-ClassUnloading -XX:+UseG1GC TestClassUnloadingDisabled 40 * 41 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 42 * -XX:-ClassUnloading -XX:+UseSerialGC TestClassUnloadingDisabled 43 * 44 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 45 * -XX:-ClassUnloading -XX:+UseParallelGC TestClassUnloadingDisabled 46 * 47 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 48 * -XX:-ClassUnloading -XX:+UseConcMarkSweepGC TestClassUnloadingDisabled 49 */ 50 51import java.io.File; 52import java.io.IOException; 53import java.nio.file.Files; 54import java.nio.file.Path; 55import java.nio.file.Paths; 56 57import sun.hotspot.WhiteBox; 58 59import static jdk.test.lib.Asserts.*; 60 61public class TestClassUnloadingDisabled { 62 public static void main(String args[]) throws Exception { 63 final WhiteBox wb = WhiteBox.getWhiteBox(); 64 // Fetch the dir where the test class and the class 65 // to be loaded resides. 66 String classDir = TestClassUnloadingDisabled.class.getProtectionDomain().getCodeSource().getLocation().getPath(); 67 String className = "ClassToLoadUnload"; 68 69 assertFalse(wb.isClassAlive(className), "Should not be loaded yet"); 70 71 // The NoPDClassLoader handles loading classes in the test directory 72 // and loads them without a protection domain, which in some cases 73 // keeps the class live regardless of marking state. 74 NoPDClassLoader nopd = new NoPDClassLoader(classDir); 75 nopd.loadClass(className); 76 77 assertTrue(wb.isClassAlive(className), "Class should be loaded"); 78 79 // Clear the class-loader, class and object references to make 80 // class unloading possible. 81 nopd = null; 82 83 System.gc(); 84 assertTrue(wb.isClassAlive(className), "Class should not have ben unloaded"); 85 } 86} 87 88class NoPDClassLoader extends ClassLoader { 89 String path; 90 91 NoPDClassLoader(String path) { 92 this.path = path; 93 } 94 95 public Class<?> loadClass(String name) throws ClassNotFoundException { 96 byte[] cls = null; 97 File f = new File(path,name + ".class"); 98 99 // Delegate class loading if class not present in the given 100 // directory. 101 if (!f.exists()) { 102 return super.loadClass(name); 103 } 104 105 try { 106 Path path = Paths.get(f.getAbsolutePath()); 107 cls = Files.readAllBytes(path); 108 } catch (IOException e) { 109 throw new ClassNotFoundException(name); 110 } 111 112 // Define class with no protection domain and resolve it. 113 return defineClass(name, cls, 0, cls.length, null); 114 } 115} 116 117class ClassToLoadUnload { 118} 119