Are all your jms messages persistent?

While debugging my application to see why it was so slow, I found from the MQ activity trace that my replies were all persistent.

The first problem was that by default all jms messages are persistent, so I used

int deliveryMode = message.getJMSDeliveryMode();

to get the persistence of the input message,

and used the obvious code to set the JMSDeliveryMode,

TextMessage response = session.createTextMessage("my reply");
response.setJMSDeliveryMode(deliveryMode);

to set it the same as the input message.  I reran my test and the reply was still persistent.

Eventually I found you need

producer = session.createProducer(dest);
producer.setDeliveryMode(deliveryMode);

And this worked!  It is all explained here.

How do I check?

You can either check your code (bearing in mind that this may be hidden by the productivity tools you use ( Swing, Camel etc)), or turn on activity trace for a couple of seconds to check.