| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8151486 |
| * @summary Call Class.forName() on the system classloader from a class loaded |
| * from a custom classloader. |
| * @library /lib/testlibrary |
| * @build jdk.testlibrary.Utils JarUtils |
| * @build ClassForName ClassForNameLeak |
| * @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak |
| */ |
| |
| import java.lang.ref.PhantomReference; |
| import java.lang.ref.Reference; |
| import java.lang.ref.ReferenceQueue; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.nio.file.FileSystems; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| import jdk.testlibrary.Utils; |
| |
| /* |
| * Create .jar, load ClassForName from .jar using a URLClassLoader |
| */ |
| public class ClassForNameLeak { |
| private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR); |
| private static final String TESTCLASSES = System.getProperty("test.classes", "."); |
| private static final String CLASSFILENAME = "ClassForName.class"; |
| private static final int THREADS = 10; |
| private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>(); |
| |
| // Use a new classloader to load the ClassForName class, then run its |
| // Runnable. |
| public static PhantomReference<ClassLoader> loadAndRun(Path jarFilePath) |
| throws Exception { |
| ClassLoader classLoader = new URLClassLoader( |
| new URL[]{jarFilePath.toUri().toURL()}) { |
| @Override public String toString() { return "LeakedClassLoader"; } |
| }; |
| |
| Class<?> loadClass = Class.forName("ClassForName", true, classLoader); |
| ((Runnable) loadClass.newInstance()).run(); |
| |
| PhantomReference<ClassLoader> ref = new PhantomReference<>(classLoader, rq); |
| System.out.println("returning phantom ref: " + ref + " to " + classLoader); |
| return ref; |
| } |
| |
| public static void main(final String[] args) throws Exception { |
| // Create a temporary .jar file containing ClassForName.class |
| Path testClassesDir = Paths.get(TESTCLASSES); |
| Path jarFilePath = Files.createTempFile("cfn", ".jar"); |
| JarUtils.createJarFile(jarFilePath, testClassesDir, CLASSFILENAME); |
| jarFilePath.toFile().deleteOnExit(); |
| |
| // Remove the ClassForName.class file that jtreg built, to make sure |
| // we're loading from the tmp .jar |
| Path classFile = FileSystems.getDefault().getPath(TESTCLASSES, |
| CLASSFILENAME); |
| Files.delete(classFile); |
| |
| // Make simultaneous calls to the test method, to stress things a bit |
| ExecutorService es = Executors.newFixedThreadPool(THREADS); |
| |
| List<Callable<PhantomReference<ClassLoader>>> callables = |
| Stream.generate(() -> { |
| Callable<PhantomReference<ClassLoader>> cprcl = () -> { |
| return loadAndRun(jarFilePath); |
| }; |
| return cprcl; |
| }).limit(THREADS).collect(Collectors.toList()); |
| |
| List<Future<PhantomReference<ClassLoader>>> refs = es.invokeAll(callables); |
| |
| // Give the GC a chance to enqueue the PhantomReferences |
| for (int i = 0; i < 10; i++) { |
| System.gc(); |
| } |
| // Make sure all PhantomReferences to the leaked classloader are enqueued |
| for (int j = 0; j < THREADS; j++) { |
| Reference rmRef = rq.remove(TIMEOUT); |
| if (rmRef == null) { |
| throw new RuntimeException("ClassLoader was never enqueued!"); |
| } else { |
| System.out.println("Enqueued " + rmRef); |
| } |
| } |
| System.out.println("All Classloaders successfully enqued"); |
| } |
| } |