This is observed during our tests where a consumer is restarted , after which we see that consumer receives duplicate messages for all the messages sent post restart. Here is the test environment. Active MQ 5.7.0 One Topic, with two active consumers and one producer. There are three JVM instances. 1. Runs the broker, 2. Runs the producer and consumer#1 3. Runs the consumer#2 When instance#3 is restarted, that consumer will start receiving duplicate messages for all the messages that producer sends (instance#2). Note that consumer running in instance #2 (which was not restarted) does not receive duplicate messages. The duplicate message delivery is not just for those messages that producer sends when consumer#2 was being restarted. It is observed for all the messages that producer sends after consumer#2 is back online as well. Can you please confirm whether this is a known issue with activeMQ 5.7 ? I tried to search the issues in JIRA but could not see a matching one.
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