The JMS specification says: “The JMSType header JMSType contains the message type identifier provided by the client when sending the message. Some JMS providers use a message repository that contains the definitions of messages sent by applications. The type header field can refer to message definitions in the providers repository. JMS does not define a standard The message definition repository does not define a naming policy for the definitions it contains.
In fact, you can set JMSType to the value of your choice, but you are asked to make sure that every application running on your JMS provider uses the same values for JMSType .