MicroProfile Reactive Messaging 3.0 introduces a number of new features and changes from MicroProfile Reactive Messaging 1.0, including negative acknowledgments, emitters, and backpressure support. In MicroProfile Reactive Messaging 1.0, messages could be only positively acknowledged. If a problem existed with the payload or if exceptional behavior occurred, no mechanism was available to indicate or to handle the problem if it occurred within the stream. The new negative acknowledgment (nack) support can send or handle these events.
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