HQ214021: Invalid concurrent session usage. Sessions are not supposed to be used by more than one thread concurrently

Issue

• We see the warning below appearing in the server.log:

WARN  [org.hornetq.core.client] (ajp-threads - 17) HQ214021: Invalid concurrent session usage. Sessions are not supposed to be used by more than one thread concurrently.: java.lang.Exception: trace
        at org.hornetq.core.client.impl.ClientSessionImpl.startCall(ClientSessionImpl.java:1312)
        at org.hornetq.core.client.impl.ClientProducerImpl.doSend(ClientProducerImpl.java:215)
        at org.hornetq.core.client.impl.ClientProducerImpl.send(ClientProducerImpl.java:140)
        at org.hornetq.jms.client.HornetQMessageProducer.doSend(HornetQMessageProducer.java:438)
        at org.hornetq.jms.client.HornetQMessageProducer.send(HornetQMessageProducer.java:194)