r</code> on the existing durable subscription.

 <p>
 If an unshared durable subscription already exists with the same name and client identifier, and there is a consumer
 already active (i.e. not closed) on the durable subscription, or consumed messages from that subscription are still
 part of a pending transaction or are not yet acknowledged in the session, then a <code>JMSException</code> will be thrown.

 <p>
 If an unshared durable subscription already exists with the same name and client identifier b