Message Acknowledgment

A message is not considered to be successfully consumed until it is acknowledged. Depending on the session acknowledgment mode, the messaging provider may send a message more than once to the same destination. Several message acknowledgment constants exist.

Value	Description
AUTO_ACKNOWLEDGE	Automatically acknowledges the successful receipt of a message.
CLIENT_ACKNOWLEDGE	Acknowledges the receipt of a message when the client calls the message’s acknowledge() method.
DUPS_OK_ACKNOWLEDGE	Instructs the session to automatically, lazily acknowledge the receipt of messages, which reduces system overhead but may result in duplicate messages being sent.