134 lines
4.9 KiB
Java
134 lines
4.9 KiB
Java
/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8151486
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* @summary Call Class.forName() on the system classloader from a class loaded
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* from a custom classloader.
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* @library /lib/testlibrary
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* @library /test/lib
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* @build jdk.test.lib.Utils JarUtils
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* @build ClassForName ClassForNameLeak
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* @run main/othervm/policy=test.policy -Djava.security.manager ClassForNameLeak
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*/
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import java.io.IOException;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.List;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import jdk.test.lib.Utils;
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/*
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* Create .jar, load ClassForName from .jar using a URLClassLoader
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*/
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public class ClassForNameLeak {
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private static final long TIMEOUT = (long)(5000.0 * Utils.TIMEOUT_FACTOR);
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private static final int THREADS = 10;
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private static final Path jarFilePath = Paths.get("cfn.jar");
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private static final ReferenceQueue<ClassLoader> rq = new ReferenceQueue<>();
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static class TestLoader {
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private final PhantomReference<ClassLoader> ref;
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TestLoader() {
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this.ref = loadAndRun();
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}
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// Use a new classloader to load the ClassForName class, then run its
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// Runnable.
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PhantomReference<ClassLoader> loadAndRun() {
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try {
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ClassLoader classLoader =
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new URLClassLoader("LeakedClassLoader",
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new URL[]{jarFilePath.toUri().toURL()},
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ClassLoader.getPlatformClassLoader());
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Class<?> loadClass = Class.forName("ClassForName", true, classLoader);
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((Runnable) loadClass.newInstance()).run();
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return new PhantomReference<>(classLoader, rq);
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} catch (MalformedURLException|ReflectiveOperationException e) {
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throw new RuntimeException(e);
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}
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}
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PhantomReference<ClassLoader> getRef() {
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return ref;
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}
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}
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public static void main(String... args) throws Exception {
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// create the JAR file
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setup();
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// Make simultaneous calls to the test method, to stress things a bit
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ExecutorService es = Executors.newFixedThreadPool(THREADS);
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List<Callable<TestLoader>> callables =
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Stream.generate(() -> {
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Callable<TestLoader> cprcl = TestLoader::new;
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return cprcl;
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}).limit(THREADS).collect(Collectors.toList());
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List<Future<TestLoader>> futures = es.invokeAll(callables);
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// Give the GC a chance to enqueue the PhantomReferences
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for (int i = 0; i < 10; i++) {
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System.gc();
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}
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// Make sure all PhantomReferences to the leaked classloader are enqueued
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for (int j = 0; j < futures.size(); j++) {
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Reference rmRef = rq.remove(TIMEOUT);
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if (rmRef == null) {
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throw new RuntimeException("ClassLoader was never enqueued!");
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} else {
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System.out.println("Enqueued " + rmRef);
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}
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}
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es.shutdown();
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System.out.println("All ClassLoaders successfully enqueued");
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}
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private static final String CLASSFILENAME = "ClassForName.class";
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private static void setup() throws IOException {
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String testclasses = System.getProperty("test.classes", ".");
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// Create a temporary .jar file containing ClassForName.class
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Path testClassesDir = Paths.get(testclasses);
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JarUtils.createJarFile(jarFilePath, testClassesDir, CLASSFILENAME);
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}
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}
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