To improve the overall performance of JMS within the system, the message listener service enables the connection pooling facility provided by the WebSphere MQ JMS implementation. This support does not affect the performance of a message listener, because it retains its connections while listening on a destination, but does affect the overall JMS system performance. When a connection is no longer required, WebSphere MQ can pool the connection then reuse it later instead of destroying it.
To enable WebSphere MQ connection pooling and configure the characteristics of the WebSphere MQ connection pool, see Enabling WebSphere MQ JMS connection pooling.
Related concepts
Asynchronous messaging using JMS - overview