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