A JMS host represents an MQ broker. The Java Message Service contains a JMS Hosts list (also called AddressList) that contains all the JMS hosts that Application Server uses.
The JMS Hosts list is populated with the hosts and ports of the specified MQ brokers and is updated whenever a JMS host configuration changes. When you create JMS resources or deploy MDBs, they inherit the JMS Hosts list.
In the Sun Java System Message Queue software, the AddressList property is called imqAddressList.
One of the hosts in the JMS Hosts list is designated the default JMS host, named Default_JMS_host. The Application Server instance starts the default JMS host when the Java Message Service type is configured as LOCAL.
If you have created a multi-broker cluster in the Sun Java System Message Queue software, delete the default JMS host, then add the Message Queue cluster’s brokers as JMS hosts. In this case, the default JMS host becomes the first one in the JMS Hosts list.
When the Application Server uses a Message Queue cluster, it executes Message Queue specific commands on the default JMS host. For example, when a physical destination is created for a Message Queue cluster of three brokers, the command to create the physical destination is executed on the default JMS host, but the physical destination is used by all three brokers in the cluster.
Use the Administration Console. Open the Java Message Service component under the relevant configuration, select the JMS Hosts component, and then click New. For more information, see the Admin Console online help.
Use the asadmin create-jms-host command. For details, see create-jms-host(1).
The JMS Hosts list is updated whenever a JMS host configuration changes.