1 /* 2 * Copyright (c) 2013, 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 import java.lang.management.ManagementFactory; 25 import java.lang.ref.WeakReference; 26 import java.lang.reflect.Field; 27 import javax.management.MBeanServer; 28 import javax.management.MBeanServerConnection; 29 import javax.management.remote.JMXConnector; 30 import javax.management.remote.JMXConnectorFactory; 31 import javax.management.remote.JMXConnectorServer; 32 import javax.management.remote.JMXConnectorServerFactory; 33 import javax.management.remote.JMXServiceURL; 34 import javax.management.remote.rmi.RMIConnector; 35 36 /* 37 * @test 38 * @bug 6566891 39 * @summary Check no memory leak on RMIConnector's nullSubjectConn 40 * @author Shanliang JIANG 41 * @modules java.management.rmi/javax.management.remote.rmi:open 42 * 43 * @run clean RMIConnectorNullSubjectConnTest 44 * @run build RMIConnectorNullSubjectConnTest 45 * @run main RMIConnectorNullSubjectConnTest 46 */ 47 48 public class RMIConnectorNullSubjectConnTest { 49 public static void main(String[] args) throws Exception { 50 System.out.println("---RMIConnectorNullSubjectConnTest starting..."); 51 52 JMXConnectorServer connectorServer = null; 53 JMXConnector connectorClient = null; 54 55 try { 56 MBeanServer mserver = ManagementFactory.getPlatformMBeanServer(); 57 JMXServiceURL serverURL = new JMXServiceURL("rmi", "localhost", 0); 58 connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(serverURL, null, mserver); 59 connectorServer.start(); 60 61 JMXServiceURL serverAddr = connectorServer.getAddress(); 62 connectorClient = JMXConnectorFactory.connect(serverAddr, null); 63 connectorClient.connect(); 64 65 Field nullSubjectConnField = RMIConnector.class.getDeclaredField("nullSubjectConnRef"); 66 nullSubjectConnField.setAccessible(true); 67 68 WeakReference<MBeanServerConnection> weak = 69 (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient); 70 71 if (weak != null && weak.get() != null) { 72 throw new RuntimeException("nullSubjectConnRef must be null at initial time."); 73 } 74 75 MBeanServerConnection conn1 = connectorClient.getMBeanServerConnection(null); 76 MBeanServerConnection conn2 = connectorClient.getMBeanServerConnection(null); 77 if (conn1 == null) { 78 throw new RuntimeException("A connection with null subject should not be null."); 79 } else if (conn1 != conn2) { 80 throw new RuntimeException("The 2 connections with null subject are not equal."); 81 } 82 83 conn1 = null; 84 conn2 = null; 85 int i = 1; 86 do { 87 System.gc(); 88 Thread.sleep(100); 89 weak = (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient); 90 } while ((weak != null && weak.get() != null) && i++ < 60); 91 92 System.out.println("---GC times: " + i); 93 94 if (weak != null && weak.get() != null) { 95 throw new RuntimeException("Failed to clean RMIConnector's nullSubjectConn"); 96 } else { 97 System.out.println("---RMIConnectorNullSubjectConnTest: PASSED!"); 98 } 99 } finally { 100 try { 101 connectorClient.close(); 102 connectorServer.stop(); 103 } catch (Exception e) { 104 } 105 } 106 } 107 }