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 * @bug 8151486 27 * @summary Call Class.forName() on the system classloader from a class loaded 28 * from a custom classloader. 29 * @library /test/lib 30 * @build jdk.test.lib.Utils 31 * jdk.test.lib.util.JarUtils 32 * @build ClassForName ClassForNameLeak 33 * @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak 34 */ 35 36 import java.io.IOException; 37 import java.lang.ref.PhantomReference; 38 import java.lang.ref.Reference; 39 import java.lang.ref.ReferenceQueue; 40 import java.net.MalformedURLException; 41 import java.net.URL; 42 import java.net.URLClassLoader; 43 import java.nio.file.Path; 44 import java.nio.file.Paths; 45 import java.util.List; 46 import java.util.concurrent.Callable; 47 import java.util.concurrent.ExecutorService; 48 import java.util.concurrent.Executors; 49 import java.util.concurrent.Future; 50 import java.util.stream.Collectors; 51 import java.util.stream.Stream; 52 53 import jdk.test.lib.Utils; 54 import jdk.test.lib.util.JarUtils; 55 56 /* 57 * Create .jar, load ClassForName from .jar using a URLClassLoader 58 */ 59 public class ClassForNameLeak { 60 private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR); 61 private static final int THREADS = 10; 62 private static final Path jarFilePath = Paths.get("cfn.jar"); 63 private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>(); 64 65 static class TestLoader { 66 private final PhantomReference<ClassLoader> ref; 67 TestLoader() { 68 this.ref = loadAndRun(); 69 } 70 71 // Use a new classloader to load the ClassForName class, then run its 72 // Runnable. 73 PhantomReference<ClassLoader> loadAndRun() { 74 try { 75 ClassLoader classLoader = 76 new URLClassLoader("LeakedClassLoader", 77 new URL[]{jarFilePath.toUri().toURL()}, 78 ClassLoader.getPlatformClassLoader()); 79 80 Class<?> loadClass = Class.forName("ClassForName", true, classLoader); 81 ((Runnable) loadClass.newInstance()).run(); 82 83 return new PhantomReference<>(classLoader, rq); 84 } catch (MalformedURLException|ReflectiveOperationException e) { 85 throw new RuntimeException(e); 86 } 87 } 88 89 PhantomReference<ClassLoader> getRef() { 90 return ref; 91 } 92 } 93 94 public static void main(String... args) throws Exception { 95 // create the JAR file 96 setup(); 97 98 // Make simultaneous calls to the test method, to stress things a bit 99 ExecutorService es = Executors.newFixedThreadPool(THREADS); 100 101 List<Callable<TestLoader>> callables = 102 Stream.generate(() -> { 103 Callable<TestLoader> cprcl = TestLoader::new; 104 return cprcl; 105 }).limit(THREADS).collect(Collectors.toList()); 106 107 List<Future<TestLoader>> futures = es.invokeAll(callables); 108 109 // Give the GC a chance to enqueue the PhantomReferences 110 for (int i = 0; i < 10; i++) { 111 System.gc(); 112 } 113 114 // Make sure all PhantomReferences to the leaked classloader are enqueued 115 for (int j = 0; j < futures.size(); j++) { 116 Reference rmRef = rq.remove(TIMEOUT); 117 if (rmRef == null) { 118 throw new RuntimeException("ClassLoader was never enqueued!"); 119 } else { 120 System.out.println("Enqueued " + rmRef); 121 } 122 } 123 es.shutdown(); 124 System.out.println("All ClassLoaders successfully enqueued"); 125 } 126 127 private static final String CLASSFILENAME = "ClassForName.class"; 128 private static void setup() throws IOException { 129 String testclasses = System.getProperty("test.classes", "."); 130 131 // Create a temporary .jar file containing ClassForName.class 132 Path testClassesDir = Paths.get(testclasses); 133 JarUtils.createJarFile(jarFilePath, testClassesDir, CLASSFILENAME); 134 } 135 }