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What is JMSType used for? Can it be used to define the message payload? For example, the payload might be for adding a product and the JMSType could be AddProduct.
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JMSType is an optional header set by the JMS client. Its name is somewhat misleading because it has nothing to do with the type of message being sent ( BytesMessage , MapMessage , etc.). Its main purpose is to identify the message structure and type of payload; it is only supported by a couple of vendors.
The Java Message Service (JMS) was designed to make it easy to develop business applications that asynchronously send and receive business data and events. It defines a common enterprise messaging API that is designed to be easily and efficiently supported by a wide range of enterprise messaging products.
JMS messages have a basic format that is simple but highly flexible, allowing you to create messages that match formats used by non-JMS applications on heterogeneous platforms. A JMS message has three parts: a header, properties, and a body. Only the header is required.
JMS defines six message interface types; a base message type and five subtypes. The message types are defined according to the type of the message payload , where the payload is the body of a message that holds the content. JMS specifies only the interface and does not specify the implementation.
JMS Specification says "The JMSType header field contains a message type identifier supplied by a
client when a message is sent. Some JMS providers use a message repository that contains the definitions of messages sent by applications. The type header field may reference a message’s
definition in the provider’s repository. JMS does not define a standard message definition repository, nor does it define a naming policy for the definitions it contains."
In effect, you can set JMSType to a value of your choice but it is suggested you make sure every application that runs on your JMS provider use the same values for JMSType.
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