117 lines
3.6 KiB
Java
117 lines
3.6 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
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* @bug 4699981 8295278
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* @summary This is a testcase for JDK-4699981. When 2 threads are loading the same class with
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* the same classloader, and somehow one of the 2 threads releases the
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* synchronization lock on the classloader, the JVM code
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* throws ClassCircularityError, mistakenly.
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* @library /test/lib
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* @compile test-classes/Base.java test-classes/Derived.java test-classes/Support.java
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* @run main/othervm ParallelCircularityTest
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*/
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import java.net.URL;
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import java.net.URLClassLoader;
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public class ParallelCircularityTest {
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private Object lock = new Object();
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private void test() throws Exception {
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URL location = getClass().getProtectionDomain().getCodeSource().getLocation();
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URLLoader loader = new URLLoader(new URL[] {location}, getClass().getClassLoader().getParent());
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Class cls = loader.loadClass("Support");
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Thread t1 = new Thread(new Run1(cls));
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t1.start();
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Thread.sleep(1000);
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// Load Derived, will trigger a loadClassInternal for Base
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loader.loadClass("Derived");
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}
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public static void main(String[] args) throws Exception {
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ParallelCircularityTest pct = new ParallelCircularityTest();
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pct.test();
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}
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public class URLLoader extends URLClassLoader {
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private boolean m_firstTime = true;
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public URLLoader(URL[] urls, ClassLoader parent) {
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super(urls, parent);
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}
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public Class loadClass(String name) throws ClassNotFoundException {
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if (name.equals("Base")) {
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if (m_firstTime) {
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m_firstTime = false;
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// Notify the other thread
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synchronized (lock) {
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lock.notifyAll();
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}
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// Wait on the classloader to have the JVM throw ClassCircularityError
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try {
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synchronized (this) {
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wait(5000);
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}
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}
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catch (InterruptedException ignored) { }
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}
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}
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return super.loadClass(name);
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}
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}
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public class Run1 implements Runnable {
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private Class cls;
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public Run1(Class cls) {
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this.cls = cls;
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}
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public void run() {
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synchronized (lock) {
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try {
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lock.wait();
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}
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catch (InterruptedException ignored) {}
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}
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// Trigger loadClassInternal for Base
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try {
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cls.newInstance();
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} catch (Throwable x) {
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x.printStackTrace();
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}
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}
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}
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}
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