public class MyConnection {

   private static MBeanServerConnection connection;
   private static JMXConnector connector;
   private static final ObjectName service;

   /*
   * Initialize connection to the Domain Runtime MBean Server.
   */
   public static void initConnection(String hostname, String portString,
      String username, String password) throws IOException,
      MalformedURLException {

      String protocol = "t3";
      Integer portInteger = Integer.valueOf(portString);
      int port = portInteger.intValue();
      String jndiroot = "/jndi/";
      String mserver = "weblogic.management.mbeanservers.domainruntime";

      JMXServiceURL serviceURL = new JMXServiceURL(protocol, hostname, port,
      jndiroot + mserver);

      Hashtable h = new Hashtable();
      h.put(Context.SECURITY_PRINCIPAL, username);
      h.put(Context.SECURITY_CREDENTIALS, password);
      h.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES,
         "weblogic.management.remote");
      h.put("jmx.remote.x.request.waiting.timeout", new Long(10000));
      connector = JMXConnectorFactory.connect(serviceURL, h);
      connection = connector.getMBeanServerConnection();
   }

   public static void main(String[] args) throws Exception {
      String hostname = args[0];
      String portString = args[1];
      String username = args[2];
      String password = args[3];

      MyConnection c= new MyConnection();
      initConnection(hostname, portString, username, password);
...
      connector.close();
   }
}

import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Hashtable;

import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import javax.naming.Context;

public class PrintServerState {

   private static MBeanServerConnection connection;
   private static JMXConnector connector;
   private static final ObjectName service;

   // Initializing the object name for DomainRuntimeServiceMBean
   // so it can be used throughout the class.
   static {
      try {
         service = new ObjectName(
            "com.bea:Name=DomainRuntimeService,Type=weblogic.management.
             mbeanservers.domainruntime.DomainRuntimeServiceMBean");
      }catch (MalformedObjectNameException e) {
         throw new AssertionError(e.getMessage());
      }
   }

   /*
   * Initialize connection to the Domain Runtime MBean Server
   */
   public static void initConnection(String hostname, String portString, 
      String username, String password) throws IOException,
      MalformedURLException { 
      String protocol = "t3";
      Integer portInteger = Integer.valueOf(portString);
      int port = portInteger.intValue();
      String jndiroot = "/jndi/";
      String mserver = "weblogic.management.mbeanservers.domainruntime";
      JMXServiceURL serviceURL = new JMXServiceURL(protocol, hostname,
         port, jndiroot + mserver);
      Hashtable h = new Hashtable();
      h.put(Context.SECURITY_PRINCIPAL, username);
      h.put(Context.SECURITY_CREDENTIALS, password);
      h.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES,
         "weblogic.management.remote");
      connector = JMXConnectorFactory.connect(serviceURL, h);
      connection = connector.getMBeanServerConnection();
   }

   /* 
   * Print an array of ServerRuntimeMBeans.
   * This MBean is the root of the runtime MBean hierarchy, and
   * each server in the domain hosts its own instance.
   */
   public static ObjectName[] getServerRuntimes() throws Exception {
      return (ObjectName[]) connection.getAttribute(service,
         "ServerRuntimes");
   }

   /* 
   * Iterate through ServerRuntimeMBeans and get the name and state
   */
   public void printNameAndState() throws Exception {
      ObjectName[] serverRT = getServerRuntimes();
      System.out.println("got server runtimes");
      int length = (int) serverRT.length;
      for (int i = 0; i < length; i++) {
         String name = (String) connection.getAttribute(serverRT[i],
            "Name");
         String state = (String) connection.getAttribute(serverRT[i],
            "State");
         System.out.println("Server name: " + name + ".   Server state: "
            + state);
      }
   }

   public static void main(String[] args) throws Exception {
      String hostname = args[0];
      String portString = args[1];
      String username = args[2];
      String password = args[3];

      PrintServerState s = new PrintServerState();
      initConnection(hostname, portString, username, password);
      s.printNameAndState();
      connector.close();
   }
}