ActiveMQ: Set priority for message is not working

Question

I have problems setting message priorities via nms. The messages are sent to the queue everything is ok but the priority is ignored.

I use the following code:

message.NMSPriority = MsgPriority.High;

Regardless what value I set for message priority, using the ActiveMQ browser I can see that the priority is always set to 4.

I also tried to add some raw headers like:

message.Properties["priority"] = 2;
message.Properties["PRIORITY"] = 5;
message.Properties["NMSPriority"] = 7;
message.Properties["JMSPriority "] = 9;

But it doesn't help.

I also have added the attribute

prioritizedMessages="true"

to the activemq.xml file. And I can send a message with priority manually via the ActiveMQ browser.

So where is the problem? What I am doing wrong?

Answer 1

Message priority is always set by the producer that sends the Message. The setter on the class will only allow you to change the value after you've received a message and is usually only used for unit testing or converting Messages between providers. To set Message priority on a per message basis have a look at the different send methods in the MessageProducer interface.