JMSMessageID — Purpose: Routing

The JMSMessageID is a String value that uniquely identifies a message. How unique the identifier is depends on the vendor. It may only be unique for that installation of the message server, or it may be universally unique.

The JMSMessageID can be useful for historical repositories in applications where messages need to be uniquely indexed. The JMSMessageID is also useful for correlating messages, which is done using the JMSCorrelationID header. Use of the JMSCorrelationID header is described in more detail in Chapter 4.

The message provider generates the JMSMessageID automatically when the message is received from a JMS client. The JMSMessageID must start with ID:, but the rest of JMSMessageID can be any collection of characters that uniquely identifies the message to the JMS provider. Here is an example of a JMSMessageID generated by Progress’s SonicMQ:

// JMSMessageID generated by SonicMQ

If a unique message ID is not needed by the JMS application, the JMS client can provide a hint to the message server that an ID is not necessary by using the setDisableMessageID() method (as shown in the following code). Vendors that heed this hint can reduce message processing time by not generating unique IDs for each message. If a JMSMessageID is not generated, the getJMSMessageID() method returns null:

// Publish-and-subscribe
TopicPublisher topicPublisher = topicSession.createPublisher(topic);
topicPublisher.setDisableMessageID(true); ...

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