| /* |
| * Copyright (c) 2006, 2015, 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 6417044 |
| * @summary Test deadlock in MBeanRegistration.postRegister method |
| * @author Eamonn McManus, Daniel Fuchs |
| * |
| * @run clean PostRegisterDeadlockTest |
| * @run build PostRegisterDeadlockTest |
| * @run main PostRegisterDeadlockTest |
| */ |
| |
| import java.lang.Thread.State; |
| import java.util.concurrent.*; |
| import javax.management.*; |
| |
| public class PostRegisterDeadlockTest { |
| public static interface BlibbyMBean {} |
| |
| public static class Blibby implements BlibbyMBean, MBeanRegistration { |
| public Blibby(MBeanServer mbs, ObjectName otherName) { |
| this.mbs = mbs; |
| this.otherName = otherName; |
| } |
| |
| public ObjectName preRegister(MBeanServer mbs, ObjectName on) { |
| return on; |
| } |
| |
| public void preDeregister() {} |
| |
| public void postRegister(Boolean done) { |
| // If no other MBean was registered |
| // do nothing. |
| // |
| if (otherName == null) return; |
| |
| // Check that we can unregister |
| // other MBean |
| try { |
| Thread t = new Thread() { |
| public void run() { |
| try { |
| try { |
| mbs.unregisterMBean(otherName); |
| } catch (InstanceNotFoundException x) { |
| // Race condition! |
| System.out.println(otherName+ |
| " was unregistered by main thread."); |
| } |
| } catch (Throwable e) { |
| e.printStackTrace(System.out); |
| fail(e.toString()); |
| } |
| } |
| }; |
| t.start(); |
| t.join(5000L); |
| if (t.isAlive()) { |
| if (t.getState().equals(State.BLOCKED)) |
| fail("Deadlock detected"); |
| else |
| fail("Test not conclusive: "+ |
| "Thread is alive but not blocked."); |
| } |
| } catch (Throwable e) { |
| e.printStackTrace(System.out); |
| fail(e.toString()); |
| } |
| } |
| |
| public void postDeregister() {} |
| |
| private final MBeanServer mbs; |
| private final ObjectName otherName; |
| } |
| |
| public static void main(String[] args) throws Exception { |
| String previous = null; |
| MBeanServer mbs = MBeanServerFactory.newMBeanServer(); |
| ObjectName on1 = new ObjectName("a:type=Blibby,name=\"1\""); |
| ObjectName on2 = new ObjectName("a:type=Blibby,name=\"2\""); |
| |
| |
| // Test 1: |
| // 1 MBean is registered with on1 |
| // Another MBean is registered with on1, postRegister(FALSE) is |
| // called, and the second MBean attempts to unregister first MBean in |
| // postRegister: |
| // postRegister starts a thread which unregisters the first MBean: |
| // this must not deadlock |
| // |
| System.out.println("\n**** TEST #1 ****\n"); |
| System.out.println("Registering Blibby #1 with name: " + on1); |
| mbs.registerMBean(new Blibby(mbs, null), on1); |
| try { |
| System.out.println("Registering Blibby #2 with same name: " + on1); |
| mbs.registerMBean(new Blibby(mbs, on1), on1); |
| } catch (InstanceAlreadyExistsException x) { |
| System.out.println("Received expected exception: " + x); |
| } |
| if (mbs.isRegistered(on1)) { |
| try { |
| mbs.unregisterMBean(on1); |
| if (failure == null) |
| fail(on1+" should have been unregistered"); |
| } catch (InstanceNotFoundException x) { |
| // Race condition! |
| System.out.println(on1+" was unregistered by mbean thread."); |
| } |
| } else { |
| System.out.println(on1+" was correctly unregistered."); |
| } |
| |
| if (failure == previous) |
| System.out.println("\n**** TEST #1 PASSED ****\n"); |
| |
| previous = failure; |
| |
| // Test 2: |
| // 1 MBean is registered with on1 |
| // Another MBean is registered with on2, postRegister(TRUE) is |
| // called, and the second MBean attempts to unregister first MBean in |
| // postRegister: |
| // postRegister starts a thread which unregisters the first MBean: |
| // this must not deadlock |
| // |
| System.out.println("\n**** TEST #2 ****\n"); |
| System.out.println("Registering Blibby #1 with name: " + on1); |
| mbs.registerMBean(new Blibby(mbs, null), on1); |
| System.out.println("Registering Blibby #2 with other name: " + on2); |
| mbs.registerMBean(new Blibby(mbs, on1), on2); |
| if (mbs.isRegistered(on1)) { |
| try { |
| mbs.unregisterMBean(on1); |
| if (failure == null) |
| fail(on1+" should have been unregistered"); |
| } catch (InstanceNotFoundException x) { |
| // Race condition! |
| System.out.println(on1+" was unregistered by mbean thread."); |
| } |
| } else { |
| System.out.println(on1+" was correctly unregistered."); |
| } |
| |
| System.out.println("unregistering "+on2); |
| mbs.unregisterMBean(on2); |
| if (failure == previous) |
| System.out.println("\n**** TEST #2 PASSED ****\n"); |
| previous = failure; |
| |
| if (failure == null) |
| System.out.println("OK: Test passed"); |
| else |
| throw new Exception("TEST FAILED: " + failure); |
| } |
| |
| private static void fail(String why) { |
| System.out.println("FAILED: " + why); |
| failure = (failure == null)?why:(failure+",\n"+why); |
| } |
| |
| private static volatile String failure; |
| } |