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/*
* Copyright (c) 2012, 2019, 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 8003833
* @summary Spurious NPE from Socket.getIn/OutputStream
*/
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Phaser;
// Racey test, will not always fail, but if it does then there is a problem.
public class Streams {
static final int NUM_THREADS = 100;
static volatile boolean failed;
static final Phaser startingGate = new Phaser(NUM_THREADS + 1);
public static void main(String[] args) throws Exception {
try (ServerSocket ss = new ServerSocket()) {
InetAddress loopback = InetAddress.getLoopbackAddress();
ss.bind(new InetSocketAddress(loopback, 0));
runTest(OutputStreamGetter.class, ss);
runTest(InputStreamGetter.class, ss);
}
if (failed)
throw new RuntimeException("Failed, check output");
}
static void runTest(Class<? extends StreamGetter> klass, ServerSocket ss)
throws Exception
{
final int port = ss.getLocalPort();
final InetAddress address = ss.getInetAddress();
Socket[] sockets = new Socket[NUM_THREADS];
for (int i=0; i<NUM_THREADS; i++) {
sockets[i] = address.isAnyLocalAddress()
? new Socket("localhost", port)
: new Socket(address, port);
try (Socket socket = ss.accept()) {}
}
Constructor<? extends StreamGetter> ctr = klass.getConstructor(Socket.class);
Thread[] threads = new Thread[NUM_THREADS];
for (int i=0; i<NUM_THREADS; i++)
threads[i] = ctr.newInstance(sockets[i]);
for (int i=0; i<NUM_THREADS; i++)
threads[i].start();
startingGate.arriveAndAwaitAdvance();
for (int i=0; i<NUM_THREADS; i++)
sockets[i].close();
for (int i=0; i<NUM_THREADS; i++)
threads[i].join();
}
static abstract class StreamGetter extends Thread {
final Socket socket;
StreamGetter(Socket s) { socket = s; }
@Override
public void run() {
try {
startingGate.arriveAndAwaitAdvance();
getStream();
} catch (IOException x) {
// OK, socket may be closed
} catch (NullPointerException x) {
x.printStackTrace();
failed = true;
}
}
abstract void getStream() throws IOException;
}
static class InputStreamGetter extends StreamGetter {
public InputStreamGetter(Socket s) { super(s); }
void getStream() throws IOException {
socket.getInputStream();
}
}
static class OutputStreamGetter extends StreamGetter {
public OutputStreamGetter(Socket s) { super(s); }
void getStream() throws IOException {
socket.getOutputStream();
}
}
}
¤ Dauer der Verarbeitung: 0.15 Sekunden
(vorverarbeitet)
¤
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