9.1.3 JMXMP Connector Server

The JMXMP connector protocol defined by Java DMK 5.1 is based on Java serialization over transmission control protocol (TCP) sockets. The JMXMP protocol is a custom protocol for JMX Remote API, and offers a more complete security solution than the RMI connector, as it can implement both the secure sockets layer (SSL) and the simple authentication and security layer (SASL) technologies. These optional security features are described in Chapter 11, Connector Security.

In the JMXMP connector, communication between server and client happens over a single TCP connection, and every message is a serialized Java object. Communication between server and client is performed in two separate streams, one for each direction, allowing multiple concurrent requests over the connection at any given time.

The JMXMP connector example is contained in the directory examplesDir/current/Connectors/jmxmp.

The code for a JMXMP connector server is shown in Example 9–2.

Example 9–2 JMXMP Connector Server

public class Server { 
 
   public static void main(String[] args) { 
      try { 
         // Instantiate the MBean server 
         // 
         MBeanServer mbs = MBeanServerFactory.createMBeanServer(); 
 
         // Create a JMXMP connector server 
         // 
         JMXServiceURL url = 
              new JMXServiceURL("jmxmp", null, 5555); 
         JMXConnectorServer cs = 
              JMXConnectorServerFactory.newJMXConnectorServer(url, 
              null, mbs); 
         cs.start(); 
       } catch (Exception e) { 
         e.printStackTrace(); 
       } 
    } 
} 
 

Firstly, the Server class creates a new MBean server named mbs by calling the createMBeanServer() method of the MBeanServerFactory class.

A call to JMXServiceURL creates a new service URL called url, which serves as an address for the connector server. This service URL defines the following:

1. The connector will use the JMXMP protocol, denoted by jmxmp.

2. No environment map is specified, as denoted by null.

3. The connector server will listen for client connections on port 5555 on the local host.

Finally, a JMXMP connector server named cs is created by calling the constructor JMXConnectorServerFactory, with the service URL url, the null environment map, and the MBean server mbs as parameters. The connector server cs is launched by calling the start() method of JMXConnectorServer, whereupon JMXMPConnectorServer, which inherits from JMXConnectorServer, starts listening for client connections.