CreateQueueConnection produce null

Question

Hi all,
I've been having trouble with my codes. The codes is like below. The purpose of this code is to established a connection with a JMS server, so I can retrieve messages in the queue.
The problem is, createQueueConnection always produce null. I have no idea why this is happening. This code is working in the 10.21.75.114 server, or in another server (10.21.75.131), but not in my machine (172.30.202.58). I've tried connecting to the server using telnet and it works.
I know that it's probably a network problem, but is there any possibility of a library or code problem?
import javax.jms.JMSException;
import javax.jms.JMSSecurityException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.util.Hashtable;
public class TesterJava implements MessageListener {
     private static QueueConnectionFactory qConnFactory;
private static InitialContext initContext;
     private QueueConnection qConn;
private QueueReceiver qReceiver;
private Queue queue;
public TesterJava () {
          super();
     public void open () throws NamingException, JMSException, JMSSecurityException {
     System.out.println ("qConnFactory "+ qConnFactory);
     if (qConnFactory != null)     
               qConn = qConnFactory.createQueueConnection();
          //System.out.println(qConn);
     public void onMessage (Message msg) {
private InitialContext getInitialContext () throws NamingException {
          Hashtable env = new Hashtable ();
          System.out.println (Context.INITIAL_CONTEXT_FACTORY);
          System.out.println (Context.PROVIDER_URL);     
          env.put (Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
          env.put (Context.PROVIDER_URL, "t3://10.21.75.114:6543");
          return new InitialContext (env);     
private void openContext () throws NamingException, JMSException {
          if (initContext==null) {
     initContext = getInitialContext();
     System.out.println(initContext);
if (qConnFactory==null) {
               qConnFactory = (QueueConnectionFactory)initContext.lookup("amdocs.ChangeOTAParamsJMSFactory");
               System.out.println ("qconnFact: "+ qConnFactory);
private void closeContext () throws NamingException {
          initContext.close ();
     private void close () throws JMSException{
          qConn.close ();          
     public static void main (String[] args) {
          TesterJava tester = new TesterJava();
     try {     
          tester.openContext();
          tester.open();
          tester.close();
          tester.closeContext();
          catch (Exception e)
               e.printStackTrace();
}

Answer 1

Hi all,
I've been having trouble with my codes. The codes is like below. The purpose of this code is to established a connection with a JMS server, so I can retrieve messages in the queue.
The problem is, createQueueConnection always produce null. I have no idea why this is happening. This code is working in the 10.21.75.114 server, or in another server (10.21.75.131), but not in my machine (172.30.202.58). I've tried connecting to the server using telnet and it works.
I know that it's probably a network problem, but is there any possibility of a library or code problem?
import javax.jms.JMSException;
import javax.jms.JMSSecurityException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.util.Hashtable;
public class TesterJava implements MessageListener {
     private static QueueConnectionFactory qConnFactory;
private static InitialContext initContext;
     private QueueConnection qConn;
private QueueReceiver qReceiver;
private Queue queue;
public TesterJava () {
          super();
     public void open () throws NamingException, JMSException, JMSSecurityException {
     System.out.println ("qConnFactory "+ qConnFactory);
     if (qConnFactory != null)     
               qConn = qConnFactory.createQueueConnection();
          //System.out.println(qConn);
     public void onMessage (Message msg) {
private InitialContext getInitialContext () throws NamingException {
          Hashtable env = new Hashtable ();
          System.out.println (Context.INITIAL_CONTEXT_FACTORY);
          System.out.println (Context.PROVIDER_URL);     
          env.put (Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
          env.put (Context.PROVIDER_URL, "t3://10.21.75.114:6543");
          return new InitialContext (env);     
private void openContext () throws NamingException, JMSException {
          if (initContext==null) {
     initContext = getInitialContext();
     System.out.println(initContext);
if (qConnFactory==null) {
               qConnFactory = (QueueConnectionFactory)initContext.lookup("amdocs.ChangeOTAParamsJMSFactory");
               System.out.println ("qconnFact: "+ qConnFactory);
private void closeContext () throws NamingException {
          initContext.close ();
     private void close () throws JMSException{
          qConn.close ();          
     public static void main (String[] args) {
          TesterJava tester = new TesterJava();
     try {     
          tester.openContext();
          tester.open();
          tester.close();
          tester.closeContext();
          catch (Exception e)
               e.printStackTrace();
}