MDB seems to be using a connection that isn't started

In a test program with an MDB I'm seeing the following log repeated lots of times:

2009-08-04 14:53:46,676 WARN [ActiveMQSessionExecutor] Received a message on a connection which is not yet started. Have you forgotten to call Connection.start()? Connection: ActiveMQConnection

{id=ID:pb.local-63908-1249422709074-2:6,clientId=ID:pb.local-63908-1249422709074-9:0,started=false}

Received: MessageDispatch {commandId = 17399, responseRequired = false, consumerId = ID:pb.local-63908-1249422709074-2:6:199:1, destination = queue://MRResponses, message = ActiveMQObjectMessage

{commandId = 959, responseRequired = false, messageId = ID:pb.local-63908-1249422709074-2:3:5:1:19, originalDestination = null, originalTransactionId = null, producerId = ID:pb.local-63908-1249422709074-2:3:5:1, destination = queue://MRResponses, transactionId = XID:1197822575:e90000000000000047544d4944000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000:010000000000000047544d4944000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, expiration = 0, timestamp = 1249422824758, arrival = 0, brokerInTime = 1249422824768, brokerOutTime = 1249422826675, correlationId = null, replyTo = null, persistent = true, type = null, priority = 0, groupID = null, groupSequence = 0, targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@54711e59, marshalledProperties = null, dataStructure = null, redeliveryCounter = 1, size = 1365, properties = null, readOnlyProperties = true, readOnlyBody = true, droppable = false}

, redeliveryCounter = 1}

It doesn't seem to prevent anything from working right but has to be slowing things down a lot.