| /* |
| * Copyright (c) 2001, 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 |
| * @summary Verify that concurrent class descriptor lookups function properly, |
| * even when class descriptor initialization is slow or throws an |
| * exception. |
| */ |
| |
| import java.io.*; |
| |
| class Good implements Serializable { |
| static { |
| try { Thread.sleep(1000); } catch (InterruptedException ex) {} |
| } |
| } |
| |
| class Bad implements Serializable { |
| // explicit suid triggers class initialization during classdesc lookup |
| private static final long serialVersionUID = 0xBAD; |
| static { |
| try { Thread.sleep(1000); } catch (InterruptedException ex) {} |
| if ("foo".equals("foo")) { |
| throw new RuntimeException(); |
| } |
| } |
| } |
| |
| class SuccessfulLookup extends Thread { |
| Class cl; |
| long suid; |
| Object barrier; |
| boolean ok; |
| |
| SuccessfulLookup(Class cl, long suid, Object barrier) { |
| this.cl = cl; |
| this.suid = suid; |
| this.barrier = barrier; |
| } |
| |
| public void run() { |
| synchronized (barrier) { |
| try { barrier.wait(); } catch (InterruptedException ex) {} |
| } |
| for (int i = 0; i < 100; i++) { |
| if (ObjectStreamClass.lookup(cl).getSerialVersionUID() != suid) { |
| return; |
| } |
| } |
| ok = true; |
| } |
| } |
| |
| class FailingLookup extends Thread { |
| Class cl; |
| Object barrier; |
| boolean ok; |
| |
| FailingLookup(Class cl, Object barrier) { |
| this.cl = cl; |
| this.barrier = barrier; |
| } |
| |
| public void run() { |
| synchronized (barrier) { |
| try { barrier.wait(); } catch (InterruptedException ex) {} |
| } |
| for (int i = 0; i < 100; i++) { |
| try { |
| ObjectStreamClass.lookup(cl); |
| return; |
| } catch (Throwable th) { |
| } |
| } |
| ok = true; |
| } |
| } |
| |
| public class ConcurrentClassDescLookup { |
| public static void main(String[] args) throws Exception { |
| ClassLoader loader = ConcurrentClassDescLookup.class.getClassLoader(); |
| Class cl = Class.forName("Good", false, loader); |
| Object barrier = new Object(); |
| SuccessfulLookup[] slookups = new SuccessfulLookup[50]; |
| for (int i = 0; i < slookups.length; i++) { |
| slookups[i] = |
| new SuccessfulLookup(cl, 6319710844400051132L, barrier); |
| slookups[i].start(); |
| } |
| Thread.sleep(1000); |
| synchronized (barrier) { |
| barrier.notifyAll(); |
| } |
| for (int i = 0; i < slookups.length; i++) { |
| slookups[i].join(); |
| if (!slookups[i].ok) { |
| throw new Error(); |
| } |
| } |
| |
| cl = Class.forName("Bad", false, loader); |
| FailingLookup[] flookups = new FailingLookup[50]; |
| for (int i = 0; i < flookups.length; i++) { |
| flookups[i] = new FailingLookup(cl, barrier); |
| flookups[i].start(); |
| } |
| Thread.sleep(1000); |
| synchronized (barrier) { |
| barrier.notifyAll(); |
| } |
| for (int i = 0; i < slookups.length; i++) { |
| flookups[i].join(); |
| if (!flookups[i].ok) { |
| throw new Error(); |
| } |
| } |
| } |
| } |