NullPointerException creating subscriber with MQ JMS & WAS 4.0
Hi!
I'm getting a NullPointerException when trying to create a subscriber to a topic and have no idea how to deal with this... Any help is very welcome!
java.lang.NullPointerException
at com.ibm.mq.MQQueue.get(MQQueue.java:636)
at com.ibm.mq.MQQueue.get(MQQueue.java:929)
at com.ibm.mq.jms.MQQueueSubscriptionEngine.removeNDSubscriptionEntry(MQQueueSubscriptionEngine.java:1009)
at com.ibm.mq.jms.MQQueueSubscriptionEngine.openSubscription(MQQueueSubscriptionEngine.java:252)
at com.ibm.mq.jms.MQMigrateSubscriptionEngine.openSubscription(MQMigrateSubscriptionEngine.java:261)
at com.ibm.mq.jms.MQTopicSession.createSubscriber(MQTopicSession.java:512)
at com.ibm.mq.jms.MQTopicSession.createSubscriber MQTopicSession.java:336)
at com.newknow.message.NK_RemoteTopicBroadcaster.addListener(NK_RemoteTopicBroadcaster.java:195).
Successful milestones were getting the administered objects from the JNDI namespace:
String icf = "com.ibm.websphere.naming.WsnInitialContextFactory";
String url = "iiop://localhost:900";// url
String tcfLookup = "JmsTopicConnectionFactory"; // Topic connection factory
lookup
// Initialize JNDI properties
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, icf);
env.put(Context.PROVIDER_URL, url);
// get JNDI context
ctx = new InitialContext(env);
// get topic connection factory
factory = (TopicConnectionFactory) ctx.lookup(tcfLookup);
topic = factory.lookupTopic(topicName);
connection = factory.createTopicConnection();
connection.start();
session = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
The NullPointer exception came at this point:
TopicSubscriber subscriber = session.createSubscriber(topic);
subscriber.setMessageListener(new JMSMessageListener(listener));
Thanks for any idea!
