question: private void connect ( ) throws IOException { JMXServiceURL jmxUrl = new JMXServiceURL ( String . format ( fmtUrl , host , port ) ) ; Map < String , Object > env = new HashMap < String , Object > ( ) ; if ( username != null ) { String [ ] creds = { username , password } ; env . put ( JMXConnector . CREDENTIALS , creds ) ; } env . put ( "com.sun.jndi.rmi.factory.socket" , getRMIClientSocketFactory ( ) ) ; jmxc = JMXConnectorFactory . connect ( jmxUrl , env ) ; mbeanServerConn = jmxc . getMBeanServerConnection ( ) ; try { ObjectName name = new ObjectName ( ssObjName ) ; ssProxy = JMX . newMBeanProxy ( mbeanServerConn , name , StorageServiceMBean . class ) ; name = new ObjectName ( MessagingService . MBEAN_NAME ) ; msProxy = JMX . newMBeanProxy ( mbeanServerConn , name , MessagingServiceMBean . class ) ; name = new ObjectName ( StreamManagerMBean . OBJECT_NAME ) ; streamProxy = JMX . newMBeanProxy ( mbeanServerConn , name , StreamManagerMBean . class ) ; name = new ObjectName ( CompactionManager . MBEAN_OBJECT_NAME ) ; compactionProxy = JMX . newMBeanProxy ( mbeanServerConn , name , CompactionManagerMBean . class ) ; name = new ObjectName ( FailureDetector . MBEAN_NAME ) ; fdProxy = JMX . newMBeanProxy ( mbeanServerConn , name , FailureDetectorMBean . class ) ; name = new ObjectName ( CacheService . MBEAN_NAME ) ; cacheService = JMX . newMBeanProxy ( mbeanServerConn , name , CacheServiceMBean . class ) ; name = new ObjectName ( StorageProxy . MBEAN_NAME ) ; spProxy = JMX . newMBeanProxy ( mbeanServerConn , name , StorageProxyMBean . class ) ; name = new ObjectName ( HintedHandOffManager . MBEAN_NAME ) ; hhProxy = JMX . newMBeanProxy ( mbeanServerConn , name , HintedHandOffManagerMBean . class ) ; name = new ObjectName ( GCInspector . MBEAN_NAME ) ; gcProxy = JMX . newMBeanProxy ( mbeanServerConn , name , GCInspectorMXBean . class ) ; name = new ObjectName ( Gossiper . MBEAN_NAME ) ; gossProxy = JMX . newMBeanProxy ( mbeanServerConn , name , GossiperMBean . class ) ; } catch ( MalformedObjectNameException e ) { throw new RuntimeException ( "Invalid ObjectName? Please report this as a bug." , e ) ; } memProxy = ManagementFactory . newPlatformMXBeanProxy ( mbeanServerConn , ManagementFactory . MEMORY_MXBEAN_NAME , MemoryMXBean . class ) ; runtimeProxy = ManagementFactory . newPlatformMXBeanProxy ( mbeanServerConn , ManagementFactory . RUNTIME_MXBEAN_NAME , RuntimeMXBean . class ) ; }
target:  Create a connection to the JMX agent and setup the M[X]Bean proxies.