115 lines
3.8 KiB
Java
115 lines
3.8 KiB
Java
/*
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* Copyright (c) 2018, 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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import java.io.IOException;
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import java.lang.reflect.*;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.URLStreamHandler;
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import java.util.concurrent.CountDownLatch;
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/*
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* @test
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* @bug 8213942
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* @summary URLStreamHandler initialization race
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* @modules java.base/java.net:open
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* @run main/othervm RacyHandler
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* @run main/othervm RacyHandler
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* @run main/othervm RacyHandler
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*/
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/*
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* This test makes reasonable effort to reproduce the race.
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* Run repeatedly to ensure correctness.
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*/
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public class RacyHandler {
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static volatile boolean factorySet = false;
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static int NUM_THREADS = 2;
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static CountDownLatch cdl = new CountDownLatch(NUM_THREADS + 1);
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public static void main(String[] args) {
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RacyHandler tester = new RacyHandler();
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tester.runTest();
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}
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public void runTest() {
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new Thread(() -> {
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try {
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cdl.await();
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URL.setURLStreamHandlerFactory(proto -> new CustomHttpHandler());
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factorySet = true;
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} catch (Exception ignore) { }
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}).start();
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cdl.countDown();
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for (int i = 0; i < NUM_THREADS; i++) {
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new Thread(() -> {
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try {
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cdl.await();
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while (!factorySet) {
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// trigger URL class load
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getURLStreamHandler();
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}
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} catch (Exception ignore) { }
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}).start();
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cdl.countDown();
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}
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// wait for the factory to be set
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while (!factorySet) { }
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// The sleep seems to help trigger the failure
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try {
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Thread.sleep(500);
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} catch (InterruptedException ie) {
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}
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URLStreamHandler httpHandler = getURLStreamHandler();
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System.out.println("After setting factory URL handlers: http " + httpHandler);
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if (!(httpHandler instanceof CustomHttpHandler))
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throw new RuntimeException("FAILED: Incorrect handler type");
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}
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/*
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* This is just so we can see what we get for the URLStreamHandler back
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* from the factory to verify whether it really is using our Handler
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* or something else...
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*/
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public URLStreamHandler getURLStreamHandler() {
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try {
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Method method = URL.class.getDeclaredMethod("getURLStreamHandler",
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String.class);
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method.setAccessible(true);
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return (URLStreamHandler) method.invoke(null, "http");
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} catch (Exception e) {
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return null;
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}
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}
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class CustomHttpHandler extends URLStreamHandler {
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@Override
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protected URLConnection openConnection(URL u) throws IOException {
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return null;
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}
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}
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}
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