Additional calls to close() following the first are ignored. This method cannot be called in a message/exception listener.
If a database connection error is detected, you can re-open a QAManager by calling the close method followed by the open method.
When re-opening a QAManager, you do not need to re-create it, reset the properties, or reset the message listeners. The properties
of the QAManager cannot be changed after the first open, and subsequent open calls must supply the same acknowledgement mode.