RMIConnectorNullSubjectConnTest.java 文件源码

public static void main(String[] args) throws Exception {
    System.out.println("---RMIConnectorNullSubjectConnTest starting...");

    JMXConnectorServer connectorServer = null;
    JMXConnector connectorClient = null;

    try {
        MBeanServer mserver = ManagementFactory.getPlatformMBeanServer();
        JMXServiceURL serverURL = new JMXServiceURL("rmi", "localhost", 0);
        connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(serverURL, null, mserver);
        connectorServer.start();

        JMXServiceURL serverAddr = connectorServer.getAddress();
        connectorClient = JMXConnectorFactory.connect(serverAddr, null);
        connectorClient.connect();

        Field nullSubjectConnField = RMIConnector.class.getDeclaredField("nullSubjectConnRef");
        nullSubjectConnField.setAccessible(true);

        WeakReference<MBeanServerConnection> weak =
                (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient);

        if (weak != null && weak.get() != null) {
            throw new RuntimeException("nullSubjectConnRef must be null at initial time.");
        }

        MBeanServerConnection conn1 = connectorClient.getMBeanServerConnection(null);
        MBeanServerConnection conn2 = connectorClient.getMBeanServerConnection(null);
        if (conn1 == null) {
            throw new RuntimeException("A connection with null subject should not be null.");
        } else if (conn1 != conn2) {
            throw new RuntimeException("The 2 connections with null subject are not equal.");
        }

        conn1 = null;
        conn2 = null;
        int i = 1;
        do {
            System.gc();
            Thread.sleep(100);
            weak = (WeakReference<MBeanServerConnection>)nullSubjectConnField.get(connectorClient);
        } while ((weak != null && weak.get() != null) && i++ < 60);

        System.out.println("---GC times: " + i);

        if (weak != null && weak.get() != null) {
            throw new RuntimeException("Failed to clean RMIConnector's nullSubjectConn");
        } else {
            System.out.println("---RMIConnectorNullSubjectConnTest: PASSED!");
        }
    } finally {
        try {
            connectorClient.close();
            connectorServer.stop();
        } catch (Exception e) {
        }
    }
}