49 lines
2.7 KiB
Plaintext
49 lines
2.7 KiB
Plaintext
[[jms]]
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= JMS (Java Message Service)
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Spring provides a JMS integration framework that simplifies the use of the JMS API in much
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the same way as Spring's integration does for the JDBC API.
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JMS can be roughly divided into two areas of functionality, namely the production and
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consumption of messages. The `JmsTemplate` class is used for message production and
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synchronous message receipt. For asynchronous receipt similar to Jakarta EE's
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message-driven bean style, Spring provides a number of message-listener containers that
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you can use to create Message-Driven POJOs (MDPs). Spring also provides a declarative way
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to create message listeners.
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The `org.springframework.jms.core` package provides the core functionality for using
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JMS. It contains JMS template classes that simplify the use of the JMS by handling the
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creation and release of resources, much like the `JdbcTemplate` does for JDBC. The
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design principle common to Spring template classes is to provide helper methods to
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perform common operations and, for more sophisticated usage, delegate the essence of the
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processing task to user-implemented callback interfaces. The JMS template follows the
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same design. The classes offer various convenience methods for sending messages,
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consuming messages synchronously, and exposing the JMS session and message producer to
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the user.
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The `org.springframework.jms.support` package provides `JMSException` translation
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functionality. The translation converts the checked `JMSException` hierarchy to a
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mirrored hierarchy of unchecked exceptions. If any provider-specific subclasses
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of the checked `jakarta.jms.JMSException` exist, this exception is wrapped in the
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unchecked `UncategorizedJmsException`.
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The `org.springframework.jms.support.converter` package provides a `MessageConverter`
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abstraction to convert between Java objects and JMS messages.
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The `org.springframework.jms.support.destination` package provides various strategies
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for managing JMS destinations, such as providing a service locator for destinations
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stored in JNDI.
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The `org.springframework.jms.annotation` package provides the necessary infrastructure
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to support annotation-driven listener endpoints by using `@JmsListener`.
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The `org.springframework.jms.config` package provides the parser implementation for the
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`jms` namespace as well as the java config support to configure listener containers and
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create listener endpoints.
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Finally, the `org.springframework.jms.connection` package provides an implementation of
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the `ConnectionFactory` suitable for use in standalone applications. It also contains an
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implementation of Spring's `PlatformTransactionManager` for JMS (the cunningly named
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`JmsTransactionManager`). This allows for seamless integration of JMS as a transactional
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resource into Spring's transaction management mechanisms.
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