Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Developer's Guide

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## The Default JMS Host

A JMS host refers to a Sun Java System Message Queue broker. A default JMS host for the JMS service is provided, named `default_JMS_host`. This is the JMS host that the Application Server instance starts when the JMS Service type is configured as `LOCAL`.

If you have created a multi-broker cluster in the 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 JMS host in the `AddressList`. (For more information about the `AddressList`, see JMS Connection Features. You can also explicitly set the default JMS host; see Configuring the JMS Service.

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.

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