javax.management.remote.JMXConnector Java Examples

private static void tryConnect(int port, boolean shouldSucceed) throws Exception {
    String jmxUrlStr =
        String.format(
            "service:jmx:rmi:///jndi/rmi://localhost:%d/jmxrmi",
            port);
    JMXServiceURL url = new JMXServiceURL(jmxUrlStr);
    HashMap<String, ?> env = new HashMap<>();

    boolean succeeded;
    try {
        JMXConnector c = JMXConnectorFactory.connect(url, env);
        c.getMBeanServerConnection();
        succeeded = true;
    } catch(Exception ex) {
        succeeded = false;
    }
    if (succeeded && !shouldSucceed) {
        throw new Exception("Could connect to agent, but should not have been possible");
    }
    if (!succeeded && shouldSucceed) {
        throw new Exception("Could not connect to agent");
    }
}
 

/**
 * Instantiates a new JMXExecutor targeting the VM indicated by the given host/port combination or a full JMX
 * Service URL
 *
 * @param target a host/port combination on the format "host:port" or a full JMX Service URL of the target VM
 */
public JMXExecutor(String target) {
    String urlStr;

    if (target.matches("^\\w[\\w\\-]*(\\.[\\w\\-]+)*:\\d+$")) {
        /* Matches "hostname:port" */
        urlStr = String.format("service:jmx:rmi:///jndi/rmi://%s/jmxrmi", target);
    } else if (target.startsWith("service:")) {
        urlStr = target;
    } else {
        throw new IllegalArgumentException("Could not recognize target string: " + target);
    }

    try {
        JMXServiceURL url = new JMXServiceURL(urlStr);
        JMXConnector c = JMXConnectorFactory.connect(url, new HashMap<>());
        mbs = c.getMBeanServerConnection();
    } catch (IOException e) {
        throw new CommandExecutorException("Could not initiate connection to target: " + target, e);
    }
}
 

public JmxDumper(String jmxService, String domain, String beanClassName, String namePattern,
    int samplePeriod, List<String> fields, List<String> operations, String outputfile,
    int sampleCount) throws Exception {
  _jmxUrl = jmxService;
  _domain = domain;
  _beanClassName = beanClassName;
  _samplePeriod = samplePeriod;
  _outputFields.addAll(fields);
  _operations.addAll(operations);
  _outputFileName = outputfile;
  _namePattern = namePattern;
  _targetSamples = sampleCount;

  JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://" + _jmxUrl + "/jmxrmi");
  JMXConnector jmxc = JMXConnectorFactory.connect(url, null);

  _mbeanServer = jmxc.getMBeanServerConnection();
  MBeanServerNotificationFilter filter = new MBeanServerNotificationFilter();
  filter.enableAllObjectNames();
  _mbeanServer.addNotificationListener(MBeanServerDelegate.DELEGATE_NAME, this, filter, null);
  init();
  _timer = new Timer(true);
  _timer.scheduleAtFixedRate(new SampleTask(), _samplePeriod, _samplePeriod);
}
 

/**
 * 获取指定程序的jvm 信息
 *
 * @param jpomTag jpomTag
 * @return null 没有运行或者获取数据
 * @throws Exception 异常
 */
public static MemoryMXBean getMemoryMXBean(String jpomTag) throws Exception {
    VirtualMachine virtualMachine = JvmUtil.getVirtualMachine(jpomTag);
    if (virtualMachine == null) {
        return null;
    }
    try {
        JMXServiceURL url = getJMXServiceURL(virtualMachine);
        if (url == null) {
            return null;
        }
        JMXConnector jmxConnector = JMXConnectorFactory.connect(url, null);
        MBeanServerConnection mBeanServerConnection = jmxConnector.getMBeanServerConnection();
        return ManagementFactory.newPlatformMXBeanProxy(mBeanServerConnection, ManagementFactory.MEMORY_MXBEAN_NAME, MemoryMXBean.class);
    } finally {
        virtualMachine.detach();
    }
}
 

private static void connect(String pid, String address) throws Exception {
    if (address == null) {
        throw new RuntimeException("Local connector address for " +
                                   pid + " is null");
    }

    System.out.println("Connect to process " + pid + " via: " + address);

    JMXServiceURL url = new JMXServiceURL(address);
    JMXConnector c = JMXConnectorFactory.connect(url);
    MBeanServerConnection server = c.getMBeanServerConnection();

    System.out.println("Connected.");

    RuntimeMXBean rt = newPlatformMXBeanProxy(server,
        RUNTIME_MXBEAN_NAME, RuntimeMXBean.class);
    System.out.println(rt.getName());

    // close the connection
    c.close();
}
 

private static DynamicEndpointSnitchMBean getDSnitchMbean(JMXServiceURL jmxUrl, Map<String, Object> env) throws IOException, MalformedObjectNameException {
  JMXConnector jmxc = JMXConnectorFactory.connect(jmxUrl, env);
  MBeanServerConnection mbeanServerConn = jmxc.getMBeanServerConnection();
  Set<ObjectName> objs = mbeanServerConn.queryNames(null, null);
  ObjectName realName = null;

  // in cassandra 1.1, the mbean has a "random" instance number, listing mbeans and finding the real one.
  for (ObjectName ob : objs) {
    if (ob.getCanonicalName().contains("DynamicEndpointSnitch"))
      realName = ob;
  }
  if (realName != null)
    return JMX.newMBeanProxy(mbeanServerConn, realName, DynamicEndpointSnitchMBean.class);
  else
    throw new RuntimeException("Could not find the DynamicEndpointSnitch mbean!");
}
 

private MBeanInfo testMBeanForDatasource() throws Exception {
    Map<String, String[]> env = new HashMap<>();
    String[] credentials = { "admin", "admin" };
    env.put(JMXConnector.CREDENTIALS, credentials);
    try {
        String url = "service:jmx:rmi://localhost:12311/jndi/rmi://localhost:11199/jmxrmi";
        JMXServiceURL jmxUrl = new JMXServiceURL(url);
        JMXConnector jmxConnector = JMXConnectorFactory.connect(jmxUrl, env);
        MBeanServerConnection mBeanServer = jmxConnector.getMBeanServerConnection();
        ObjectName mbeanObject = new ObjectName(dataSourceName + ",-1234:type=DataSource");
        MBeanInfo mBeanInfo = mBeanServer.getMBeanInfo(mbeanObject);
        return mBeanInfo;
    } catch (MalformedURLException | MalformedObjectNameException | IntrospectionException |
            ReflectionException e) {
        throw new AxisFault("Error while connecting to MBean Server " + e.getMessage(), e);
    }
}
 

private MBeanServerCollector buildMBeanServerCollector(JmxServerConfiguration config)
		throws JmxMBeanServerConnectionException {

	JMXConnector connection = null;

	try {
		JMXServiceURL url = new JMXServiceURL(config.getServiceUrl());
		connection = JMXConnectorFactory.connect(url);
		MBeanServerConnection server = connection.getMBeanServerConnection();
		return new MBeanServerCollector(config, server, connection);
	} catch (IOException e) {
		if (connection != null) {
			ResourceUtils.close(connection);
		}
		throw new JmxMBeanServerConnectionException(
				"Faild to connect to JMX Server " + config.getServiceUrl() + ".", e);
	}
}
 

/**
 * create a new JMX Connection with auth when username and password is set.
 */
public static MBeanServerConnection createJMXConnection(String url,
        String host, String port, String username, String password)
        throws MalformedURLException, IOException {
    String urlForJMX;
    if (url != null)
        urlForJMX = url;
    else
        urlForJMX = JMX_SERVICE_PREFIX + host + ":" + port
                + JMX_SERVICE_SUFFIX;
    Map<String, String[]> environment = null;
    if (username != null && password != null) {
        String[] credentials = new String[2];
        credentials[0] = username;
        credentials[1] = password;
        environment = new HashMap<String, String[]>();
        environment.put(JMXConnector.CREDENTIALS, credentials);
    }
    return JMXConnectorFactory.connect(new JMXServiceURL(urlForJMX),
            environment).getMBeanServerConnection();

}
 

public static void main(String[] args) throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    Sender sender = new Sender();
    mbs.registerMBean(sender, testObjectName);
    JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://");
    JMXConnectorServer cs =
        JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);
    cs.start();
    JMXServiceURL addr = cs.getAddress();
    JMXConnector cc = JMXConnectorFactory.connect(addr);
    try {
        test(mbs, cs, cc);
    } finally {
        cc.close();
        cs.stop();
    }
}
 

/**
 * Instantiates a new JMXExecutor targeting the VM indicated by the given host/port combination or a full JMX
 * Service URL
 *
 * @param target a host/port combination on the format "host:port" or a full JMX Service URL of the target VM
 */
public JMXExecutor(String target) {
    String urlStr;

    if (target.matches("^\\w[\\w\\-]*(\\.[\\w\\-]+)*:\\d+$")) {
        /* Matches "hostname:port" */
        urlStr = String.format("service:jmx:rmi:///jndi/rmi://%s/jmxrmi", target);
    } else if (target.startsWith("service:")) {
        urlStr = target;
    } else {
        throw new IllegalArgumentException("Could not recognize target string: " + target);
    }

    try {
        JMXServiceURL url = new JMXServiceURL(urlStr);
        JMXConnector c = JMXConnectorFactory.connect(url, new HashMap<>());
        mbs = c.getMBeanServerConnection();
    } catch (IOException e) {
        throw new CommandExecutorException("Could not initiate connection to target: " + target, e);
    }
}
 

private static void close(JMXConnector connector) {
	if (connector != null) {
		try {
			connector.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
 

public JMXConnector newJMXConnector(JMXServiceURL serviceURL,
                                    Map<String,?> environment)
        throws IOException {
    if (!serviceURL.getProtocol().equals("rmi")) {
        throw new MalformedURLException("Protocol not rmi: " +
                                        serviceURL.getProtocol());
    }
    return new RMIConnector(serviceURL, environment);
}
 

@RolesAllowed( {
        "Karaf-Server-Administration|Write", "Karaf-Server-Administration|Read", "System-Management|Write",
        "System-Management|Update"
} )
@Override
public String executeJMXCommand( final String commandStr )
{
    String result = "No Result";

    JMXConnector connector = null;
    try
    {
        HashMap<String, String[]> environment = new HashMap<>();
        String[] credentials = new String[] { IdentityManager.ADMIN_USERNAME, IdentityManager.ADMIN_DEFAULT_PWD };
        environment.put( JMXConnector.CREDENTIALS, credentials );

        JMXServiceURL url = new JMXServiceURL( "service:jmx:rmi:///jndi/rmi://localhost:1099/karaf-root" );
        connector = JMXConnectorFactory.connect( url, environment );
        MBeanServerConnection mbeanServer = connector.getMBeanServerConnection();
        ObjectName systemMBean = new ObjectName( "org.apache.karaf:type=bundle,name=root" );
        mbeanServer.invoke( systemMBean, commandStr, null, null );
    }
    catch ( Exception e )
    {
        LOG.warn( e.getMessage() );
    }
    finally
    {
        SafeCloseUtil.close( connector );
    }

    return result;
}
 

public static List<ThreadPoolStatus> getMonitoredThreadPools(List<Pair<String,JMXConnector>> mbscArray) throws MalformedObjectNameException, IOException {
	List<ThreadPoolStatus> monitoredThreadPools =new ArrayList<>();
	for (Pair<String,JMXConnector> mbsc: mbscArray) {
		monitoredThreadPools.add(getNewMBeanProxy(mbsc.getSecond(),MONITORED_THREAD_POOL,ThreadPoolStatus.class));
	}
	return monitoredThreadPools;
}
 

private static void testWithException(boolean send)
throws Exception {
    ClassLoader zoobyCL = new ZoobyClassLoader();
    Class<?> zoobyClass = Class.forName("Zooby", false, zoobyCL);
    Object zooby = zoobyClass.newInstance();

    JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///");
    JMXConnectorServer cs =
            JMXConnectorServerFactory.newJMXConnectorServer(url, null, pmbs);
    cs.start();
    JMXServiceURL addr = cs.getAddress();
    JMXConnector cc = JMXConnectorFactory.connect(addr);
    MBeanServerConnection mbsc = cc.getMBeanServerConnection();

    Object rzooby;
    if (send) {
        System.out.println("Sending object...");
        mbsc.setAttribute(getSetName, new Attribute("It", zooby));
        rzooby = getSetInstance.getIt();
    } else {
        System.out.println("Receiving object...");
        getSetInstance.setIt(zooby);
        rzooby = mbsc.getAttribute(getSetName, "It");
    }

    if (!rzooby.getClass().getName().equals("Zooby")) {
        throw new Exception("FAILED: remote object is not a Zooby");
    }
    if (rzooby.getClass().getClassLoader() ==
            zooby.getClass().getClassLoader()) {
        throw new Exception("FAILED: same class loader: " +
                zooby.getClass().getClassLoader());
    }

    cc.close();
    cs.stop();
}
 

public JMXConnector newJMXConnector(JMXServiceURL url,
                                    Map<String,?> map)
    throws IOException {
    final String protocol = url.getProtocol();
    called = true;
    System.out.println("JMXConnectorProviderImpl called");

    if(protocol.equals("rmi"))
        return new RMIConnector(url, map);
    if(protocol.equals("throw-provider-exception"))
        throw new JMXProviderException("I have been asked to throw");

    throw new IllegalArgumentException("UNKNOWN PROTOCOL");
}
 

/**
 * JMX连接
 * @param url
 * JMX连接地址
 * @param jmxUser
 * JMX授权用户 null为无授权用户
 * @param jmxPassword
 * JMX授权密码 null为无授权密码
 * @param timeout
 * 超时时间
 * @param unit
 * 超时单位
 * @return
 * @throws IOException
 */
public static JMXConnector connectWithTimeout( final JMXServiceURL url,String jmxUser,String jmxPassword, long timeout, TimeUnit unit) throws Exception {
    final BlockingQueue<Object> blockingQueue = new ArrayBlockingQueue<>(1);
    ExecuteThreadUtil.execute(() -> {
        try {
            JMXConnector connector;
            if(jmxUser != null && jmxPassword != null){
                Map<String,Object> env = new HashMap<>();
                String[] credentials = new String[] { jmxUser, jmxPassword };
                env.put(JMXConnector.CREDENTIALS, credentials);
                connector = JMXConnectorFactory.connect(url,env);
            }else{
                connector = JMXConnectorFactory.connect(url,null);
            }
            if (!blockingQueue.offer(connector))
                connector.close();
        } catch (Throwable t) {
            blockingQueue.offer(t);
        }
    });

    Object result = BlockingQueueUtil.getResult(blockingQueue,timeout,unit);
    blockingQueue.clear();


    if (result instanceof JMXConnector){
        return (JMXConnector) result;
    }else if (result == null){
        throw new SocketTimeoutException("Connect timed out: " + url);
    }else if(result instanceof Throwable){
        throw new IOException("JMX Connect Failed : " + url,((Throwable) result));
    }
    return null;
}
 

public <T> T executeAction(@NonNull final JmxAction<T> action, @NullAllowed Callable<String> nonProxy) throws Exception {
    return executeAction(new Callable<T>() {

        @Override
        public T call() throws Exception {
            JMXServiceURL url = new JMXServiceURL(config.isSecured() ? "t3s" : "t3", // NOI18N
                    config.getHost(), config.getPort(), "/jndi/weblogic.management.mbeanservers.domainruntime"); // NOI18N

            String username = config.getUsername();
            String password = config.getPassword();

            Map<String, Object> env = new HashMap<String, Object>();
            env.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES,
                    "weblogic.management.remote"); // NOI18N
            env.put(javax.naming.Context.SECURITY_PRINCIPAL, username);
            env.put(javax.naming.Context.SECURITY_CREDENTIALS, password);
            env.put("jmx.remote.credentials", // NOI18N
                    new String[]{username, password});
            env.put("jmx.remote.protocol.provider.class.loader", //NOI18N
                    config.getLayout().getClassLoader());

            JMXConnector jmxConnector = JMXConnectorFactory.newJMXConnector(url, env);
            jmxConnector.connect();
            try {
                return action.execute(jmxConnector.getMBeanServerConnection());
            } finally {
                jmxConnector.close();
            }
        }
    }, nonProxy);
}
 

@Override
public Map<String, DatabaseVersion> getClusterDatabaseVersions() throws SQLException{
    final Map<String, DatabaseVersion> dbVersions=new HashMap<>();
    operate(new JMXServerOperation(){
        @Override
        public void operate(List<Pair<String, JMXConnector>> connections) throws MalformedObjectNameException, IOException, SQLException{
            List<DatabaseVersion> databaseVersions=JMXUtils.getSpliceMachineVersion(connections);
            int i=0;
            for(DatabaseVersion databaseVersion : databaseVersions){
                dbVersions.put(connections.get(i).getFirst(),databaseVersion);
            }
        }
    });
    return dbVersions;
}
 

private JMXConnector connectToServer(JMXConnectorServer server) throws IOException, MalformedObjectNameException, NullPointerException, InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException, ReflectionException, MBeanException {
    JMXServiceURL url = server.getAddress();
    Map<String, Object> env = new HashMap<String, Object>();
    JMXConnector connector = JMXConnectorFactory.connect(url, env);

    System.out.println("DEBUG: Client connected to RMI at: " + url);

    return connector;
}
 

@Override
public int attachToProcess(int localProcessId) throws RemoteException {
    logger.info("Attaching to process {}", localProcessId);
    try {
        for (VirtualMachineDescriptor desc : VirtualMachine.list()) {
            if (Integer.parseInt(desc.id()) == localProcessId) {
                VirtualMachine vm = VirtualMachine.attach(desc);
                vm.startLocalManagementAgent();
                Properties props = vm.getAgentProperties();
                String connectorAddress = props
                    .getProperty(CONNECTOR_ADDRESS_PROPERTY_KEY);
                JMXServiceURL url = new JMXServiceURL(connectorAddress);
                JMXConnector connector = JMXConnectorFactory.connect(url);
                MBeanServerConnection mbeanConn = connector
                    .getMBeanServerConnection();
                attachedVMs.put(localProcessId, JMX.newMXBeanProxy(mbeanConn,
                            JCozProfiler.getMBeanName(),
                            JCozProfilerMBean.class));
                return JCozProfilingErrorCodes.NORMAL_RETURN;
            }
        }
    } catch (IOException | NumberFormatException
            | AttachNotSupportedException e) {
        StringWriter stringWriter = new StringWriter();
        e.printStackTrace(new PrintWriter(stringWriter));
        logger.error("Got an exception during attachToProcess, stacktrace: {}", stringWriter);
        throw new RemoteException("", e);

            }
    return JCozProfilingErrorCodes.INVALID_JAVA_PROCESS;
}
 

private static void disconnect(String app) {
    try {
        JMConnBean jmConnBean = conns.remove(app);
        JSONObject quit = new JSONObject();
        quit.put("type", "quit");
        quit.put("app", app);
        JMEevntCenter.getInstance().send(quit);
        JMXConnector conn = jmConnBean.getConnector();
        conn.removeConnectionNotificationListener(INSTANCE);
        conn.close();
    } catch (Exception e) {
        log.error("disconnect error:" + e);
    }
}
 

/** Get topic size from kafka jmx. */
public JSONObject topicSize(String clusterAlias, String topic) {
	String jmx = "";
	JMXConnector connector = null;
	List<MetadataInfo> leaders = kafkaService.findKafkaLeader(clusterAlias, topic);
	long tpSize = 0L;
	for (MetadataInfo leader : leaders) {
		String jni = kafkaService.getBrokerJMXFromIds(clusterAlias, leader.getLeader());
		jmx = String.format(JMX, jni);
		try {
			JMXServiceURL jmxSeriverUrl = new JMXServiceURL(jmx);
			connector = JMXFactoryUtils.connectWithTimeout(jmxSeriverUrl, 30, TimeUnit.SECONDS);
			MBeanServerConnection mbeanConnection = connector.getMBeanServerConnection();
			String objectName = String.format(KafkaLog.SIZE.getValue(), topic, leader.getPartitionId());
			Object size = mbeanConnection.getAttribute(new ObjectName(objectName), KafkaLog.VALUE.getValue());
			tpSize += Long.parseLong(size.toString());
		} catch (Exception ex) {
			LOG.error("Get topic size from jmx has error, msg is " + ex.getMessage());
			ex.printStackTrace();
		} finally {
			if (connector != null) {
				try {
					connector.close();
				} catch (IOException e) {
					LOG.error("Close jmx connector has error, msg is " + e.getMessage());
				}
			}
		}
	}

	return StrUtils.stringifyByObject(tpSize);
}
 

public JMXConnector newJMXConnector(JMXServiceURL serviceURL,
                                    Map<String,?> environment)
        throws IOException {
    if (!serviceURL.getProtocol().equals("rmi")) {
        throw new MalformedURLException("Protocol not rmi: " +
                                        serviceURL.getProtocol());
    }
    return new RMIConnector(serviceURL, environment);
}
 

public static void main(String[] args) throws Exception {
    JMXServiceURL inputAddr =
        new JMXServiceURL("service:jmx:iiop://");
    JMXConnectorServer s;
    try {
        s = JMXConnectorServerFactory.newJMXConnectorServer(inputAddr, null, null);
    } catch (java.net.MalformedURLException x) {
        try {
            Class.forName("javax.management.remote.rmi._RMIConnectionImpl_Tie");
            throw new RuntimeException("MalformedURLException thrown but iiop appears to be supported");
        } catch (ClassNotFoundException expected) { }
        System.out.println("IIOP protocol not supported, test skipped");
        return;
    }
    MBeanServer mbs = MBeanServerFactory.createMBeanServer();
    mbs.registerMBean(s, new ObjectName("a:b=c"));
    s.start();
    JMXServiceURL outputAddr = s.getAddress();
    if (!outputAddr.getURLPath().startsWith("/ior/IOR:")) {
        throw new RuntimeException("URL path should start with \"/ior/IOR:\": " +
                                   outputAddr);
    }
    System.out.println("IIOP URL path looks OK: " + outputAddr);
    JMXConnector c = JMXConnectorFactory.connect(outputAddr);
    System.out.println("Successfully got default domain: " +
                       c.getMBeanServerConnection().getDefaultDomain());
    c.close();
    s.stop();
}
 

/**
 * Get kafka os memory.
 */
public long getOSMemory(String host, int port, String property) {
	JMXConnector connector = null;
	long memory = 0L;
	String JMX = "service:jmx:rmi:///jndi/rmi://%s/jmxrmi";
	try {
		JMXServiceURL jmxSeriverUrl = new JMXServiceURL(String.format(JMX, host + ":" + port));
		connector = JMXFactoryUtils.connectWithTimeout(jmxSeriverUrl, 30, TimeUnit.SECONDS);
		MBeanServerConnection mbeanConnection = connector.getMBeanServerConnection();
		MemoryMXBean memBean = ManagementFactory.newPlatformMXBeanProxy(mbeanConnection, ManagementFactory.MEMORY_MXBEAN_NAME, MemoryMXBean.class);
		long max = memBean.getHeapMemoryUsage().getMax();
		long used = memBean.getHeapMemoryUsage().getUsed();
		if (BrokerServer.TOTAL_PHYSICAL_MEMORY_SIZE.getValue().equals(property)) {
			memory = max;
		} else if (BrokerServer.FREE_PHYSICAL_MEMORY_SIZE.getValue().equals(property)) {
			memory = max - used;
		}
	} catch (Exception ex) {
		LOG.error("Get kafka os memory from jmx has error, msg is " + ex.getMessage());
	} finally {
		if (connector != null) {
			try {
				connector.close();
			} catch (IOException e) {
				LOG.error("Close kafka os memory jmx connector has error, msg is " + e.getMessage());
			}
		}
	}
	return memory;
}
 

public JMXConnector newJMXConnector(JMXServiceURL url,
                                    Map<String,?> map)
    throws IOException {
    final String protocol = url.getProtocol();
    called = true;
    System.out.println("JMXConnectorProviderImpl called");

    if(protocol.equals("rmi"))
        return new RMIConnector(url, map);
    if(protocol.equals("throw-provider-exception"))
        throw new JMXProviderException("I have been asked to throw");

    throw new IllegalArgumentException("UNKNOWN PROTOCOL");
}
 

public static void main(String[] args) throws Exception {
	AttachUtils.printJVMVersion();
	String pid = AttachUtils.checkPid(args);
	JMXConnector connector = JMXConnectorFactory.connect(AttachUtils.startLocalAgent(pid));
	MBeanServerConnection connection = connector.getMBeanServerConnection();
	List<GarbageCollectorMXBean> mBeans = getGarbageCollectorMBeans(connection, getGCNames(connection));

	registerNotifications(connection, mBeans);
	printInitGCStats(mBeans);

	System.out.println("Waiting for GC notifications!");
	System.out.println("Press <enter> to exit!");
	System.in.read();
}
 

private JMXConnector connectToServer(JMXConnectorServer server) throws IOException, MalformedObjectNameException, NullPointerException, InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException, ReflectionException, MBeanException {
    JMXServiceURL url = server.getAddress();
    Map<String, Object> env = new HashMap<String, Object>();
    JMXConnector connector = JMXConnectorFactory.connect(url, env);

    System.out.println("DEBUG: Client connected to RMI at: " + url);

    return connector;
}