JMS messages

 

JMS messages are composed of the following parts:

Header

All messages support the same set of header fields. Header fields contain values that are used by both clients and providers to identify and route messages.

Properties

Each message contains a built-in facility to support application-defined property values. Properties provide an efficient mechanism to filter application-defined messages.

Body

JMS defines several types of message body that cover the majority of messaging styles currently in use.

JMS defines five types of message body:

Stream

A stream of Java™ primitive values. It is filled and read sequentially.

Map

A set of name-value pairs, where names are strings and values are Java primitive types. The entries can be accessed sequentially or randomly by name. The order of the entries is undefined.

Text

A message containing a java.lang.String.

Object

a message that contains a serializable Java object

Bytes

A stream of uninterpreted bytes. This message type is for literally encoding a body to match an existing message format.

The JMSCorrelationID header field is used to link one message with another. It typically links a reply message with its requesting message. JMSCorrelationID can hold a provider-specific message ID, an application-specific String, or a provider-native byte[] value.

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