JMS Queue ConnectionsGuys,

[Joe San]

Guys,

I have a very basic question. Let's say I have a Queue configured in a JMS server (ActiveMQ for example). I have one Producer connected to that Queue and it is sending messages to that Queue. Can I have multiple Consumers connected to that Queue. I understand that the Queue semantics is One - To - One. I'm also aware that only one Consumer would get the message. But what happens when I already have a Consumer connected to that Queue and I try to start another Consumer? Any idea as to what the JMS specifications says regarding this?

[Lucas Smith]

You can have multiple consumers. Some time ago I tested it with Message Driven Beans (MDB) on Glassfish3 server. A couple of MDBs were listening on the Queue. When I sent the message to that queue exactly one MDB received it. The receivers were picked in a random way.

[Joe San]

Lucas Smith wrote:You can have multiple consumers. Some time ago I tested it with Message Driven Beans (MDB) on Glassfish3 server. A couple of MDBs were listening on the Queue. When I sent the message to that queue exactly one MDB received it. The receivers were picked in a random way.

Looks even more strange to me. I thought that the JMS server would allow only one connection as a consumer to a Queue. Every other clients trying to make a connection will get an exception. I guess I need to look into the JMS specification!