The error occurs on startup, so I don't get a chance to connect an external client. I tried replacing the client jar in activemq/lib (replaced activemq-client-5.12.0.jar with activemq-client-5.11.1.jar), but that logs another error.
2015-09-12 17:03:24,431 ERROR o.a.activemq.broker.BrokerService - Failed to start Apache ActiveMQ ([eda2e5a4c4d0, null], {}) java.lang.IllegalArgumentException: Invalid version: 11, could not load org.apache.activemq.openwire.v11.MarshallerFactory at org.apache.activemq.openwire.OpenWireFormat.setVersion(OpenWireFormat.java:324) ~[activemq-client-5.11.1.jar:5.11.1] at org.apache.activemq.store.jdbc.JDBCPersistenceAdapter.doStart(JDBCPersistenceAdapter.java:318) ~[activemq-jdbc-store-5.12.0.jar:5.12.0] -- View this message in context: http://activemq.2283324.n4.nabble.com/ActiveMQ-exits-on-startup-with-UTFDataFormatException-bad-string-tp4701955p4701964.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.