1 /* 2 * Copyright (c) 2016, 2018, 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 driver ClassFileInstaller sun.hotspot.WhiteBox 36 * sun.hotspot.WhiteBox$WhiteBoxPermission 37 * 38 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 39 * -XX:-ClassUnloading -XX:+UseG1GC TestClassUnloadingDisabled 40 * 41 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 42 * -XX:-ClassUnloading -XX:+UseSerialGC TestClassUnloadingDisabled 43 * 44 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 45 * -XX:-ClassUnloading -XX:+UseParallelGC TestClassUnloadingDisabled 46 * 47 */ 48 49 /* 50 * @test 51 * @key gc 52 * @bug 8114823 53 * @comment Graal does not support CMS 54 * @requires vm.gc=="null" & !vm.graal.enabled 55 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 56 * @requires vm.opt.ClassUnloading != true 57 * @library /test/lib 58 * @modules java.base/jdk.internal.misc 59 * java.management 60 * @build sun.hotspot.WhiteBox 61 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 62 * sun.hotspot.WhiteBox$WhiteBoxPermission 63 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 64 * -XX:-ClassUnloading -XX:+UseConcMarkSweepGC TestClassUnloadingDisabled 65 */ 66 67 /* 68 * @test TestClassUnloadingDisabledShenandoah 69 * @key gc 70 * @bug 8114823 71 * @comment Graal does not support Shenandoah 72 * @requires vm.gc.Shenandoah & !vm.graal.enabled 73 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 74 * @requires vm.opt.ClassUnloading != true 75 * @library /test/lib 76 * @modules java.base/jdk.internal.misc 77 * java.management 78 * @build sun.hotspot.WhiteBox 79 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 80 * sun.hotspot.WhiteBox$WhiteBoxPermission 81 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 82 * -XX:-ClassUnloading -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC TestClassUnloadingDisabled 83 */ 84 85 import java.io.File; 86 import java.io.IOException; 87 import java.nio.file.Files; 88 import java.nio.file.Path; 89 import java.nio.file.Paths; 90 91 import sun.hotspot.WhiteBox; 92 93 import static jdk.test.lib.Asserts.*; 94 95 public class TestClassUnloadingDisabled { 96 public static void main(String args[]) throws Exception { 97 final WhiteBox wb = WhiteBox.getWhiteBox(); 98 // Fetch the dir where the test class and the class 99 // to be loaded resides. 100 String classDir = TestClassUnloadingDisabled.class.getProtectionDomain().getCodeSource().getLocation().getPath(); 101 String className = "ClassToLoadUnload"; 102 103 assertFalse(wb.isClassAlive(className), "Should not be loaded yet"); 104 105 // The NoPDClassLoader handles loading classes in the test directory 106 // and loads them without a protection domain, which in some cases 107 // keeps the class live regardless of marking state. 108 NoPDClassLoader nopd = new NoPDClassLoader(classDir); 109 nopd.loadClass(className); 110 111 assertTrue(wb.isClassAlive(className), "Class should be loaded"); 112 113 // Clear the class-loader, class and object references to make 114 // class unloading possible. 115 nopd = null; 116 117 System.gc(); 118 assertTrue(wb.isClassAlive(className), "Class should not have ben unloaded"); 119 } 120 } 121 122 class NoPDClassLoader extends ClassLoader { 123 String path; 124 125 NoPDClassLoader(String path) { 126 this.path = path; 127 } 128 129 public Class<?> loadClass(String name) throws ClassNotFoundException { 130 byte[] cls = null; 131 File f = new File(path,name + ".class"); 132 133 // Delegate class loading if class not present in the given 134 // directory. 135 if (!f.exists()) { 136 return super.loadClass(name); 137 } 138 139 try { 140 Path path = Paths.get(f.getAbsolutePath()); 141 cls = Files.readAllBytes(path); 142 } catch (IOException e) { 143 throw new ClassNotFoundException(name); 144 } 145 146 // Define class with no protection domain and resolve it. 147 return defineClass(name, cls, 0, cls.length, null); 148 } 149 } 150 151 class ClassToLoadUnload { 152 }