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 * @run clean RMIConnectorNullSubjectConnTest 43 * @run build RMIConnectorNullSubjectConnTest 44 * @run main RMIConnectorNullSubjectConnTest 45 */ 46 47 public class RMIConnectorNullSubjectConnTest { 48 public static void main(String[] args) throws Exception { 49 System.out.println("---RMIConnectorNullSubjectConnTest starting..."); 50 51 JMXConnectorServer connectorServer = null; 52 JMXConnector connectorClient = null; 53 54 try { 55 MBeanServer mserver = ManagementFactory.getPlatformMBeanServer(); 56 JMXServiceURL serverURL = new JMXServiceURL("rmi", "localhost", 0); 57 connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(serverURL, null, mserver); 58 connectorServer.start(); 59 60 JMXServiceURL serverAddr = connectorServer.getAddress(); 61 connectorClient = JMXConnectorFactory.connect(serverAddr, null); 62 connectorClient.connect(); 63 64 Field nullSubjectConnField = RMIConnector.class.getDeclaredField("nullSubjectConnRef"); 65 nullSubjectConnField.setAccessible(true); 66 67 WeakReference<MBeanServerConnection> weak = 68 (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient); 69 70 if (weak != null && weak.get() != null) { 71 throw new RuntimeException("nullSubjectConnRef must be null at initial time."); 72 } 73 74 MBeanServerConnection conn1 = connectorClient.getMBeanServerConnection(null); 75 MBeanServerConnection conn2 = connectorClient.getMBeanServerConnection(null); 76 if (conn1 == null) { 77 throw new RuntimeException("A connection with null subject should not be null."); 78 } else if (conn1 != conn2) { 79 throw new RuntimeException("The 2 connections with null subject are not equal."); 80 } 81 82 conn1 = null; 83 conn2 = null; 84 int i = 1; 85 do { 86 System.gc(); 87 Thread.sleep(100); 88 weak = (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient); 89 } while ((weak != null && weak.get() != null) && i++ < 60); 90 91 System.out.println("---GC times: " + i); 92 93 if (weak != null && weak.get() != null) { 94 throw new RuntimeException("Failed to clean RMIConnector's nullSubjectConn"); 95 } else { 96 System.out.println("---RMIConnectorNullSubjectConnTest: PASSED!"); 97 } 98 } finally { 99 try { 100 connectorClient.close(); 101 connectorServer.stop(); 102 } catch (Exception e) { 103 } 104 } 105 } 106 }