Ab Sharma

I am getting the following error ...(failed to create MQQueueManager for '') while tryingto get a JMS connection .. Can somebody help... I am appending the code and the exception faced


------------------------Code-----------------------
/* * Created on Aug 20, 2004 * * To change the template for this generated file go to * Window>Preferences>Java>Code Generation>Code and Comments */ package com.jasmine.utils; import java.util.Hashtable; import javax.jms.JMSException; import javax.jms.Session; import javax.jms.TextMessage; import javax.jms.Topic; import javax.jms.TopicConnection; import javax.jms.TopicConnectionFactory; import javax.jms.TopicPublisher; import javax.jms.TopicSession; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; /** * @author Administrator * * To change the template for this generated type comment go to * Window>Preferences>Java>Code Generation>Code and Comments */ public class MessageSender { public final static String JNDI_FACTORY = "com.ibm.websphere.naming.WsnInitialContextFactory"; public final static String JMS_FACTORY = "javax.jms.TopicConnectionFactory"; public final static String TOPIC = "testtopic"; public final static String URL = "t3://localhost:7001"; protected TopicConnectionFactory tconFactory; protected TopicConnection tcon; protected TopicSession tsession; protected TopicPublisher tpublisher; protected Topic topic; protected TextMessage msg; public void init(Context ctx, String topicName) throws NamingException, JMSException{ tconFactory = (TopicConnectionFactory) ctx.lookup("javax.jms.TopicConnectionFactory"); tcon=tconFactory.createTopicConnection(); tsession = tcon.createTopicSession(false,Session.AUTO_ACKNOWLEDGE); topic = (Topic)ctx.lookup(topicName); tpublisher = tsession.createPublisher(topic); msg = tsession.createTextMessage(); tcon.start(); } public void sendMessage(String message) throws JMSException{ try { InitialContext ctx = getInitialContext(URL); init(ctx,TOPIC); send(message); } catch (Exception e) { throw new JMSException(e.getMessage()); } finally{ close(); } } public void send(String value) throws JMSException{ msg.setText(value); tpublisher.publish(msg); } public void close() throws JMSException{ tpublisher.close(); tsession.close(); tcon.close(); } protected static InitialContext getInitialContext(String url) throws NamingException{ Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY,JNDI_FACTORY); env.put(Context.PROVIDER_URL,url); env.put("weblogc.jndi.createIntermediateContexts","true"); return new InitialContext(env); } public static void main(String[] args) throws Exception{ /*if (args.length!=1) { System.out.println("Usage: java MessageSender <initialContextURL>"); return; } */ InitialContext ic = getInitialContext("iiop://localhost:2809"); //InitialContext ic = new InitialContext(); if (ic==null) System.out.println("Problem"); MessageSender sender = new MessageSender(); sender.init(ic,TOPIC); System.out.println("Sending.."); sender.send("abhishek here from client"); System.out.println("Sent successfully"); sender.close(); } }
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--------------------------Exception----------------------------
javax.jms.JMSException: MQJMS2005: failed to create MQQueueManager for ''
at com.ibm.mq.jms.services.ConfigEnvironment.newException(ConfigEnvironment.java:556)
at com.ibm.mq.jms.MQConnection.createQM(MQConnection.java:1736)
at com.ibm.mq.jms.MQConnection.createQMNonXA(MQConnection.java:1129)
at com.ibm.mq.jms.MQTopicConnection.<init>(MQTopicConnection.java:207)
at com.ibm.mq.jms.MQTopicConnection.<init>(MQTopicConnection.java:127)
at com.ibm.mq.jms.MQTopicConnectionFactory.createMQTopicConnection(MQTopicConnectionFactory.java:389)
at com.ibm.mq.jms.MQTopicConnectionFactory.createTopicConnection(MQTopicConnectionFactory.java:262)
at com.jasmine.utils.MessageSender.init(MessageSender.java:46)
at com.jasmine.utils.MessageSender.main(MessageSender.java:99)
Exception in thread "P=816903 =0:CT"
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[ August 21, 2004: Message edited by: Marilyn de Queiroz ]

Praveen,

Congrats on your certificaion!
I too am planning for the exam. I want to know if any mock/evaluation/Sample tests are available on net. I will be higly appreciative if you could pass any exams you culled while preparing.

Thanks,
Abhishek (rush2abhishek@rediffmail.com)
IBM, Bangalore

No Rajani,

b is a byte... so has 7 bits ie can attain calues from +127 to -128. So the loop wraps around after 128 and gets the cvalue -127 and terminates.

Hope that clarifies..

Rajani,

By default 6.5 is taken as double rathe than float. and Math.round has only two signatures:

static long round(double a)
static int round(float a)

So C should be the correct answer as the return value should be long.

Hopre that clarifies..
Abhishek

Sridhar,

You must have tried and know the answer for your query.
The explanation is :-

ClassCastException occurs whenever the actual object does not have a "is a" relationship with the class it is being casted to.

Lets analyze this rule in context with the ablve example:-
Cat "is a" animal.
So if a cat object is casted to an animal its well and good.

Example cited in the second post first casts the cat object to an animal. So when this object is being casted to a Dog, obviously exception occurs as Cat "Is NOT a" Dog.

Creating an Animal object and casting to a Cat is again not aceptable as Animal "is NOT a" cat .. only reverse is true.

Hope that was useful..
Regards