Overview
ActiveMQ 4.0 now supports acknowledging a range of messages in a single batch operations. This option is enabled by default since it decreases load on the broker and therefore increases overall performance.
Disabling Optimized Acknowledgements using a Connection URI
cf = new ActiveMQConnectionFactory("tcp:);
Disabling Optimized Acknowledgements at the ConnectionFactory Level
((ActiveMQConnectionFactory)connectionFactory).setOptimizeAcknowledge(false);
Disabling Optimized Acknowledgements at the Connection Level
((ActiveMQConnection)connection).setOptimizeAcknowledge(false);
