1 /* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 /* 26 * @test 27 * @bug 6760712 28 * @summary test the connector server option that causes it not to prevent the 29 * VM from exiting 30 * @author Shanliang JIANG, Eamonn McManus 31 * @modules java.management.rmi 32 * @run main/othervm DaemonRMIExporterTest 33 */ 34 import java.util.Arrays; 35 import java.util.Collections; 36 import java.util.HashSet; 37 import java.util.Map; 38 import java.util.Set; 39 40 import javax.management.MBeanServerFactory; 41 import javax.management.remote.JMXConnector; 42 import javax.management.remote.JMXConnectorFactory; 43 import javax.management.remote.JMXServiceURL; 44 import javax.management.remote.JMXConnectorServer; 45 import javax.management.remote.JMXConnectorServerFactory; 46 47 // Test the connector server option that causes it not to prevent the VM 48 // from exiting. It's tricky to test exactly that, though possible. If 49 // we're being run from within jtreg, then jtreg has threads of its own 50 // that will prevent the VM from exiting. What's more it will kill all 51 // threads that the test created as soon as the main method returns, 52 // including the ones that would prevent the VM from exiting without the 53 // special option. 54 // Here we check that the test code does not create 55 // any permanent non-daemon threads, by recording the initial set of 56 // non-daemon threads (including at least one from jtreg), doing our stuff, 57 // then waiting for there to be no non-daemon threads that were not in 58 // the initial set. 59 public class DaemonRMIExporterTest { 60 public static void main(String[] args) throws Exception { 61 Set<Thread> initialNonDaemonThreads = getNonDaemonThreads(); 62 63 JMXServiceURL addr = new JMXServiceURL("rmi", null, 0); 64 System.out.println("DaemonRMIExporterTest: Creating a RMIConnectorServer on " + addr); 65 Map<String, ?> env = 66 Collections.singletonMap("jmx.remote.x.daemon", "true"); 67 JMXConnectorServer server = 68 JMXConnectorServerFactory.newJMXConnectorServer(addr, 69 env, 70 MBeanServerFactory.createMBeanServer()); 71 server.start(); 72 System.out.println("DaemonRMIExporterTest: Started the server on " + server.getAddress()); 73 74 System.out.println("DaemonRMIExporterTest: Connecting a client to the server ..."); 75 final JMXConnector conn = JMXConnectorFactory.connect(server.getAddress()); 76 conn.getMBeanServerConnection().getDefaultDomain(); 77 78 System.out.println("DaemonRMIExporterTest: Closing the client ..."); 79 conn.close(); 80 81 System.out.println("DaemonRMIExporterTest No more user code to execute, the VM should " + 82 "exit normally, otherwise will be blocked forever if the bug is not fixed."); 83 84 long deadline = System.currentTimeMillis() + 10000; 85 ok: { 86 while (System.currentTimeMillis() < deadline) { 87 Set<Thread> nonDaemonThreads = getNonDaemonThreads(); 88 nonDaemonThreads.removeAll(initialNonDaemonThreads); 89 if (nonDaemonThreads.isEmpty()) 90 break ok; 91 System.out.println("Non-daemon threads: " + nonDaemonThreads); 92 try { 93 Thread.sleep(500); 94 } catch (InterruptedException e) { 95 throw new AssertionError(e); 96 } 97 } 98 throw new Exception("TEST FAILED: non-daemon threads remain"); 99 } 100 101 System.out.println("TEST PASSED"); 102 } 103 104 private static Set<Thread> getNonDaemonThreads() { 105 ThreadGroup tg = Thread.currentThread().getThreadGroup(); 106 while (tg.getParent() != null) 107 tg = tg.getParent(); 108 Thread[] threads = null; 109 for (int size = 10; size < 10000; size *= 2) { 110 threads = new Thread[size]; 111 int n = tg.enumerate(threads, true); 112 if (n < size) { 113 threads = Arrays.copyOf(threads, n); 114 break; 115 } 116 } 117 Set<Thread> ndThreads = new HashSet<Thread>(); 118 for (Thread t : threads) { 119 if (!t.isDaemon()) 120 ndThreads.add(t); 121 } 122 return ndThreads; 123 } 124 }