JBoss Messaging 1.3/ JBoss AS (4.2.1)

We have an incoming message Queue and a pool of MDB's listening. The MDB's process the data and have to post results onto another Queue. This is the code for the posting to the reply Queue:

@Resource(mappedName = "java:/JmsXA")
private static QueueConnectionFactory factory;

@Resource(mappedName = "/queue/ResolvedUniversalResourceQueue")
private static Queue destinationReply;

public void onMessage( Message msg)
 {
 // Process incoming msg and get it ready to be sent outward
 //
 //
 qConnection = factory.createQueueConnection();
 QueueSession qSession = qConnection.createQueueSession( false, Session.DUPS_OK_ACKNOWLEDGE);
 QueueSender qSender = qSession.createSender( destinationReply);
 qSender.send( qSession.createObjectMessage( urimsg));
 qSender.close();
}

a. Is it ok to create new QueueConnections every time ? Especially since i use the java:/JMSXA connection factory ?
b. Is it ok to create Sessions and QueueSender every single invoke ?

Is there any best practice for pooling/sharing Sessions and QueueSender ?