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/*
* Copyright (c) 2009, 2012, 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 6799583
*
* @summary Test verifes that LogManager shutdown hook does not cause
* an application classloader leaks.
*
* @run main/othervm ClassLoaderLeakTest
*/
import java.io.File;
import java.lang.ref.WeakReference;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.concurrent.CountDownLatch;
import java.util.logging.Logger;
public class ClassLoaderLeakTest {
private static CountDownLatch doneSignal;
private static CountDownLatch launchSignal;
private static ThreadGroup appsThreadGroup;
private static Throwable launchFailure = null;
public static void main(String[] args) {
appsThreadGroup = new ThreadGroup("MyAppsThreadGroup");
doneSignal = new CountDownLatch(1);
launchSignal = new CountDownLatch(1);
Runnable launcher = new Runnable() {
public void run() {
try {
ClassLoader cl =
Thread.currentThread().getContextClassLoader();
Class<?> appMain = cl.loadClass("AppTest");
Method launch =
appMain.getDeclaredMethod("launch", doneSignal.getClass());
Constructor<?> c = appMain.getConstructor();
Object o = c.newInstance();
launch.invoke(o, doneSignal);
} catch (Throwable e) {
launchFailure = e;
} finally {
launchSignal.countDown();
}
}
};
/* prepare test class loader */
URL pwd = null;
try {
pwd = new File(System.getProperty("test.classes",".")).toURI().toURL();
} catch (MalformedURLException e) {
throw new RuntimeException("Test failed.", e);
}
URL[] urls = new URL[] { pwd };
MyClassLoader appClassLoader = new MyClassLoader(urls, "test0");
WeakReference<MyClassLoader> ref =
new WeakReference<>(appClassLoader);
Thread appThread = new Thread(appsThreadGroup, launcher, "AppThread-0");
appThread.setContextClassLoader(appClassLoader);
appThread.start();
appClassLoader = null;
launcher = null;
appThread = null;
/* wait for laucnh completion */
try {
launchSignal.await();
} catch (InterruptedException e) {
}
/* check if launch failed */
if (launchFailure != null) {
throw new RuntimeException("Test failed.", launchFailure);
}
/* wait for test app excution completion */
try {
doneSignal.await();
} catch (InterruptedException e) {
}
/* give a chence to GC */
waitAndGC(5);
if (ref.get() != null) {
throw new RuntimeException("Test failed: classloader is still alive");
}
System.out.println("Test passed.");
}
private static class MyClassLoader extends URLClassLoader {
private static boolean verbose =
Boolean.getBoolean("verboseClassLoading");
private String uniqClassName;
public MyClassLoader(URL[] urls, String uniq) {
super(urls);
uniqClassName = uniq;
}
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (verbose) {
System.out.printf("%s: load class %s\n", uniqClassName, name);
}
if (uniqClassName.equals(name)) {
return Object.class;
}
return super.loadClass(name);
}
public String toString() {
return "MyClassLoader(" + uniqClassName + ")";
}
}
private static void waitAndGC(int sec) {
int cnt = sec;
System.out.print("Wait ");
while (cnt-- > 0) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
// do GC every 3 seconds
if (cnt % 3 == 2) {
System.gc();
System.out.print("+");
} else {
System.out.print(".");
}
//checkErrors();
}
System.out.println("");
}
}
class AppTest {
public AppTest() {
}
public void launch(CountDownLatch done) {
Logger log = Logger.getLogger("app_test_logger");
log.fine("Test app is launched");
done.countDown();
}
}
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