| /* |
| * Copyright (c) 2009, 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. |
| */ |
| |
| package test; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.lang.ref.Reference; |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.WeakReference; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Method; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.HashMap; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| import java.util.concurrent.CountDownLatch; |
| import javax.imageio.stream.ImageInputStream; |
| import sun.awt.AppContext; |
| import sun.awt.SunToolkit; |
| |
| public class Main { |
| |
| private static ThreadGroup appsThreadGroup; |
| |
| private static WeakHashMap<MyClassLoader, String> refs = |
| new WeakHashMap<MyClassLoader, String>(); |
| |
| /** Collection to simulate forgrotten streams **/ |
| private static HashMap<String, ImageInputStream> strongRefs = |
| new HashMap<String, ImageInputStream>(); |
| |
| private static ConcurrentLinkedQueue<Throwable> problems = |
| new ConcurrentLinkedQueue<Throwable>(); |
| |
| private static AppContext mainAppContext = null; |
| |
| private static CountDownLatch doneSignal; |
| |
| private static final int gcTimeout = |
| Integer.getInteger("gcTimeout", 10).intValue(); |
| |
| private static boolean forgetSomeStreams = |
| Boolean.getBoolean("forgetSomeStreams"); |
| |
| public static void main(String[] args) throws IOException { |
| mainAppContext = SunToolkit.createNewAppContext(); |
| System.out.println("Current context class loader: " + |
| Thread.currentThread().getContextClassLoader()); |
| |
| appsThreadGroup = new ThreadGroup("MyAppsThreadGroup"); |
| |
| File jar = new File("TestApp.jar"); |
| if (!jar.exists()) { |
| System.out.println(jar.getAbsolutePath() + " was not found!\n" + |
| "Please install the jar with test application correctly!"); |
| throw new RuntimeException("Test failed: no TestApp.jar"); |
| } |
| |
| URL[] urls = new URL[]{jar.toURL()}; |
| |
| int numApps = Integer.getInteger("numApps", 20).intValue(); |
| |
| doneSignal = new CountDownLatch(numApps); |
| int cnt = 0; |
| while (cnt++ < numApps) { |
| launch(urls, "testapp.Main", "launch"); |
| |
| checkErrors(); |
| } |
| |
| System.out.println("Wait for apps completion...."); |
| |
| try { |
| doneSignal.await(); |
| } catch (InterruptedException e) { |
| } |
| |
| System.out.println("All apps finished."); |
| |
| System.gc(); |
| |
| System.out.flush(); |
| |
| System.out.println("Enumerate strong refs:"); |
| for (String is : strongRefs.keySet()) { |
| System.out.println("-> " + is); |
| } |
| |
| System.out.println("======================="); |
| |
| // wait few seconds |
| waitAndGC(gcTimeout); |
| |
| doneSignal = new CountDownLatch(1); |
| |
| Runnable workaround = new Runnable() { |
| |
| public void run() { |
| AppContext ctx = null; |
| try { |
| ctx = SunToolkit.createNewAppContext(); |
| } catch (Throwable e) { |
| // ignore... |
| } finally { |
| doneSignal.countDown(); |
| } |
| } |
| }; |
| |
| Thread wt = new Thread(appsThreadGroup, workaround, "Workaround"); |
| wt.setContextClassLoader(new MyClassLoader(urls, "workaround")); |
| wt.start(); |
| wt = null; |
| workaround = null; |
| |
| System.out.println("Wait for workaround completion..."); |
| |
| try { |
| doneSignal.await(); |
| } catch (InterruptedException e) { |
| } |
| |
| // give a chance to GC |
| waitAndGC(gcTimeout); |
| |
| if (!refs.isEmpty()) { |
| System.out.println("Classloaders still alive:"); |
| |
| for (MyClassLoader l : refs.keySet()) { |
| String val = refs.get(l); |
| |
| if (val == null) { |
| throw new RuntimeException("Test FAILED: Invalid classloader name"); |
| } |
| System.out.println("->" + val + (strongRefs.get(val) != null ? |
| " (has strong ref)" : "")); |
| if (strongRefs.get(val) == null) { |
| throw new RuntimeException("Test FAILED: exta class loader is detected! "); |
| } |
| } |
| } else { |
| System.out.println("No alive class loaders!!"); |
| } |
| System.out.println("Test PASSED."); |
| } |
| |
| 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(""); |
| } |
| |
| private static void checkErrors() { |
| while (!problems.isEmpty()) { |
| Throwable theProblem = problems.poll(); |
| System.out.println("Test FAILED!"); |
| do { |
| theProblem.printStackTrace(System.out); |
| theProblem = theProblem.getCause(); |
| } while (theProblem != null); |
| throw new RuntimeException("Test FAILED"); |
| } |
| } |
| static int counter = 0; |
| |
| private static void launch(URL[] urls, final String className, |
| final String methodName) |
| { |
| final String uniqClassName = "testapp/Uniq" + counter; |
| final boolean saveStrongRef = forgetSomeStreams ? (counter % 5 == 4) : false; |
| |
| System.out.printf("%s: launch the app\n", uniqClassName); |
| Runnable launchIt = new Runnable() { |
| public void run() { |
| AppContext ctx = SunToolkit.createNewAppContext(); |
| |
| try { |
| Class appMain = |
| ctx.getContextClassLoader().loadClass(className); |
| Method launch = appMain.getDeclaredMethod(methodName, |
| strongRefs.getClass()); |
| |
| Constructor c = appMain.getConstructor(String.class, |
| problems.getClass()); |
| |
| Object o = c.newInstance(uniqClassName, problems); |
| |
| if (saveStrongRef) { |
| System.out.printf("%s: force strong ref\n", |
| uniqClassName); |
| launch.invoke(o, strongRefs); |
| } else { |
| HashMap<String, ImageInputStream> empty = null; |
| launch.invoke(o, empty); |
| } |
| |
| ctx = null; |
| } catch (Throwable e) { |
| problems.add(e); |
| } finally { |
| doneSignal.countDown(); |
| } |
| } |
| }; |
| |
| MyClassLoader appClassLoader = new MyClassLoader(urls, uniqClassName); |
| |
| refs.put(appClassLoader, uniqClassName); |
| |
| Thread appThread = new Thread(appsThreadGroup, launchIt, |
| "AppThread" + counter++); |
| appThread.setContextClassLoader(appClassLoader); |
| |
| appThread.start(); |
| launchIt = null; |
| appThread = null; |
| appClassLoader = null; |
| } |
| |
| 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 + ")"; |
| } |
| } |
| } |