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/*
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* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/**
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* @test
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* @bug 6799583
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*
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* @summary Test verifes that LogManager shutdown hook does not cause
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* an application classloader leaks.
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*
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* @run main/othervm ClassLoaderLeakTest
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*/
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import java.io.File;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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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.util.concurrent.CountDownLatch;
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import java.util.logging.Logger;
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import java.util.logging.Logger;
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public class ClassLoaderLeakTest {
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private static CountDownLatch doneSignal;
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private static CountDownLatch launchSignal;
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private static ThreadGroup appsThreadGroup;
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private static Throwable launchFailure = null;
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public static void main(String[] args) {
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appsThreadGroup = new ThreadGroup("MyAppsThreadGroup");
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doneSignal = new CountDownLatch(1);
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launchSignal = new CountDownLatch(1);
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Runnable launcher = new Runnable() {
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public void run() {
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try {
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ClassLoader cl =
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Thread.currentThread().getContextClassLoader();
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Class appMain = cl.loadClass("AppTest");
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Method launch =
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appMain.getDeclaredMethod("launch", doneSignal.getClass());
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Constructor c = appMain.getConstructor();
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Object o = c.newInstance();
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launch.invoke(o, doneSignal);
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} catch (Throwable e) {
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launchFailure = e;
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} finally {
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launchSignal.countDown();
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}
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}
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};
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/* prepare test class loader */
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URL pwd = null;
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try {
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pwd = new File(System.getProperty("test.classes",".")).toURL();
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} catch (MalformedURLException e) {
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throw new RuntimeException("Test failed.", e);
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}
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URL[] urls = new URL[] { pwd };
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MyClassLoader appClassLoader = new MyClassLoader(urls, "test0");
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WeakReference<MyClassLoader> ref =
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new WeakReference<MyClassLoader>(appClassLoader);
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Thread appThread = new Thread(appsThreadGroup, launcher, "AppThread-0");
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appThread.setContextClassLoader(appClassLoader);
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appThread.start();
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appClassLoader = null;
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launcher = null;
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appThread = null;
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/* wait for laucnh completion */
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try {
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launchSignal.await();
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} catch (InterruptedException e) {
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}
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/* check if launch failed */
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if (launchFailure != null) {
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throw new RuntimeException("Test failed.", launchFailure);
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}
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/* wait for test app excution completion */
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try {
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doneSignal.await();
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} catch (InterruptedException e) {
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}
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/* give a chence to GC */
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waitAndGC(5);
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if (ref.get() != null) {
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throw new RuntimeException("Test failed: classloader is still alive");
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}
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System.out.println("Test passed.");
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}
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private static class MyClassLoader extends URLClassLoader {
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private static boolean verbose =
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Boolean.getBoolean("verboseClassLoading");
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private String uniqClassName;
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public MyClassLoader(URL[] urls, String uniq) {
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super(urls);
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uniqClassName = uniq;
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}
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public Class loadClass(String name) throws ClassNotFoundException {
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if (verbose) {
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System.out.printf("%s: load class %s\n", uniqClassName, name);
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}
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if (uniqClassName.equals(name)) {
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return Object.class;
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}
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return super.loadClass(name);
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}
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public String toString() {
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return "MyClassLoader(" + uniqClassName + ")";
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}
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}
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private static void waitAndGC(int sec) {
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int cnt = sec;
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System.out.print("Wait ");
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while (cnt-- > 0) {
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try {
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Thread.sleep(1000);
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} catch (InterruptedException e) {
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}
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// do GC every 3 seconds
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if (cnt % 3 == 2) {
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System.gc();
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System.out.print("+");
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} else {
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System.out.print(".");
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}
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//checkErrors();
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}
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System.out.println("");
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}
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}
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class AppTest {
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public AppTest() {
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}
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public void launch(CountDownLatch done) {
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Logger log = Logger.getLogger("app_test_logger");
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log.fine("Test app is launched");
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done.countDown();
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}
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}
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