RELIABLE_DELIVERY
EMS extends the JMS delivery modes to include reliable delivery. Sending a RELIABLE_DELIVERY message omits the server confirmation to improve performance regardless of the authorization setting.
Also see authorization.
When using RELIABLE_DELIVERY mode, the server never sends the producer a receipt confirmation or access denial and the producer does not wait for it. Reliable mode decreases the volume of message traffic, allowing higher message rates, which is useful for messages containing time-dependent data, such as stock price quotations.
When you use the reliable delivery mode, the client application does not receive any response from the server. Therefore, all publish calls will always succeed (not throw an exception) unless the connection to the server has been terminated.
In some cases a message published in reliable mode may be disqualified and not handled by the server because the destination is not valid or access has been denied. In this case, the message is not sent to any message consumer. However, unless the connection to the server has been terminated, the publishing application will not receive any exceptions, despite the fact that no consumer received the message.