The reproducer need Byteman installed and a default Broker running. https://github.com/agagliardi/reproducer-ENTMQBR-4988   Install Byteman Running a broker with defaults run the reproducer with: export MAVEN_OPTS=-javaagent:$BYTEMAN_HOME/lib/byteman.jar=script:amqclient.btm mvn clean compile exec:java -Dexec.arguments="tcp://xxxxx:61616" produce some message on  ./artemis producer --destination topic://test --message-count 10 --message-size 10 --user admin --password admin --url tcp://xxxxx:61616 the reproducer will receive a message a will wait 30 sec to break the network before trying the rollback   Byteman wait 30 second before ClientSessionImpl#flushAcks. break the network, with iptables for example wait that the rollback failure fix the network (delete iptables rule) press ENTER on the reproducer stdin the reproducer stuck on the message Setting echo listener, now message should be received but will not as it's a bug .     It seems that the ClientSession is no more able to recover after an exception during the rollback. https://github.com/apache/activemq-artemis/blob/58e59ef67989f06675c488e16d4418f766e46549/artemis-core-client/src/main/java/org/apache/activemq/artemis/core/client/impl/ClientSessionImpl.java#L1023