lished when there is no active consumer associated with it. The Jakarta Messaging provider retains a record
 of this durable subscription and ensures that all messages from the topic's publishers are retained until they are
 delivered to, and acknowledged by, a consumer on this durable subscription or until they have expired.

 <p>
 A durable subscription will continue to accumulate messages until it is deleted using the <code>unsubscribe</code> method.

 <p>
 This method may only be used with non-shared du