153 lines
6.7 KiB
Java
153 lines
6.7 KiB
Java
/*
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* Copyright (c) 2022, 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 Make sure class unloading occur even if ClassLoaderStats VM operations are executed
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* @bug 8297427
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* @requires vm.opt.final.ClassUnloading
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* @modules java.base/jdk.internal.misc
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* @library /test/lib classes
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* @build jdk.test.whitebox.WhiteBox test.Empty test.LoadInParent test.LoadInChild
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:gc*,class+unload=debug UnloadTestDuringClassLoaderStatsVMOperation
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*/
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import java.lang.ref.Reference;
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import java.net.URLClassLoader;
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import jdk.test.lib.classloader.ClassUnloadCommon;
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import jdk.test.whitebox.WhiteBox;
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public class UnloadTestDuringClassLoaderStatsVMOperation {
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private static final WhiteBox wb = WhiteBox.getWhiteBox();
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private static String className = "test.Empty";
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private static String parentClassName = "test.LoadInParent";
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private static String childClassName = "test.LoadInChild";
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public static void main(String args[]) throws Exception {
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// Create a thread forcing ClassLoaderStats VM operations.
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var clsThread = new Thread(() -> {
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while (true) {
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wb.forceClassLoaderStatsSafepoint();
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}
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});
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clsThread.setDaemon(true);
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clsThread.start();
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// Make sure classes can be unloaded even though the class loader
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// stats VM operation is running.
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testClassIsUnloaded();
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testClassLoadedInParentIsUnloaded();
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}
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public static void testClassIsUnloaded() throws Exception {
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ClassUnloadCommon.failIf(wb.isClassAlive(className), className + " is not expected to be alive yet");
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// Load a test class and verify that it gets unloaded once we do a major collection.
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var classLoader = ClassUnloadCommon.newClassLoader();
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var loaded = classLoader.loadClass(className);
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var object = loaded.getDeclaredConstructor().newInstance();
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ClassUnloadCommon.failIf(!wb.isClassAlive(className), className + " should be loaded and live");
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// Using reachabilityFence() to ensure the object is live. If the test
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// is run with -Xcomp and ergonomically triggered GCs occur the class
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// could otherwise be unloaded before verified to be alive above.
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Reference.reachabilityFence(object);
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System.out.println("testClassIsUnloaded loaded klass: " + className);
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// Make class unloadable.
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classLoader = null;
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loaded = null;
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object = null;
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// Full/Major collection should always unload classes.
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wb.fullGC();
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ClassUnloadCommon.failIf(wb.isClassAlive(className), className + " should have been unloaded");
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}
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public static void testClassLoadedInParentIsUnloaded() throws Exception {
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ClassUnloadCommon.failIf(wb.isClassAlive(parentClassName), parentClassName + " is not expected to be alive yet");
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ClassUnloadCommon.failIf(wb.isClassAlive(childClassName), childClassName + " is not expected to be alive yet");
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// Create two class loaders and load a test class in the parent and
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// verify that it gets unloaded once we do a major collection.
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var parentClassLoader = ClassUnloadCommon.newClassLoader();
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var childClassLoader = new ChildURLClassLoader((URLClassLoader) parentClassLoader);
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var loadedParent = parentClassLoader.loadClass(parentClassName);
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var loadedChild = childClassLoader.loadClass(childClassName);
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var parent = loadedParent.getDeclaredConstructor().newInstance();
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var child = loadedChild.getDeclaredConstructor().newInstance();
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ClassUnloadCommon.failIf(!wb.isClassAlive(parentClassName), parentClassName + " should be loaded and live");
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ClassUnloadCommon.failIf(!wb.isClassAlive(childClassName), childClassName + " should be loaded and live");
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// Using reachabilityFence() to ensure the objects are live. If the test
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// is run with -Xcomp and ergonomically triggered GCs occur they could
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// otherwise be unloaded before verified to be alive above.
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Reference.reachabilityFence(parent);
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Reference.reachabilityFence(child);
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System.out.println("testClassLoadedInParentIsUnloaded loaded klass: " + loadedParent);
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System.out.println("testClassLoadedInParentIsUnloaded loaded klass: " + loadedChild);
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// Clear to allow unloading.
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parentClassLoader = null;
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childClassLoader = null;
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loadedParent = null;
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loadedChild = null;
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parent = null;
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child = null;
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// Full/Major collection should always unload classes.
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wb.fullGC();
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ClassUnloadCommon.failIf(wb.isClassAlive(parentClassName), parentClassName + " should have been unloaded");
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ClassUnloadCommon.failIf(wb.isClassAlive(childClassName), childClassName + " should have been unloaded");
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}
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static class ChildURLClassLoader extends URLClassLoader {
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public ChildURLClassLoader(URLClassLoader parent) {
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super("ChildURLClassLoader", parent.getURLs(), parent);
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}
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@Override
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public Class<?> loadClass(String cn, boolean resolve) throws ClassNotFoundException {
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synchronized (getClassLoadingLock(cn)) {
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Class<?> c = findLoadedClass(cn);
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if (c == null) {
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try {
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c = findClass(cn);
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} catch (ClassNotFoundException e) {
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c = getParent().loadClass(cn);
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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}
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}
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}
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