n, then the durable subscription will be deleted and a new one
 created.

 <p>
 A shared durable subscription and an unshared durable subscription may not have the same name and client identifier.
 If a shared durable subscription already exists with the same name and client identifier then a <code>JMSException</code>
 is thrown.

 <p>
 There is no restriction on durable subscriptions and shared non-durable subscriptions having the same name and
 clientId. Such subscriptions would be completely separate.

 