Using Spring JMS

This section describes how to use Spring’s JMS components.

Using JmsTemplate

The JmsTemplate class is the central class in the JMS core package. It simplifies the use of JMS, since it handles the creation and release of resources when sending or synchronously receiving messages.

Code that uses the JmsTemplate needs only to implement callback interfaces that give them a clearly defined high-level contract. The MessageCreator callback interface creates a message when given a Session provided by the calling code in JmsTemplate. To allow for more complex usage of the JMS API, SessionCallback provides the JMS session, and ProducerCallback exposes a Session and MessageProducer pair.

The JMS API exposes two types of send methods, one that takes delivery mode, priority, and time-to-live as Quality of Service (QOS) parameters and one that takes no QOS parameters and uses default values. Since JmsTemplate has many send methods, setting the QOS parameters have been exposed as bean properties to avoid duplication in the number of send methods. Similarly, the timeout value for synchronous receive calls is set by using the setReceiveTimeout property.

Some JMS providers allow the setting of default QOS values administratively through the configuration of the ConnectionFactory. This has the effect that a call to a MessageProducer instance’s send method (send(Destination destination, Message message)) uses different QOS default values than those specified in the JMS specification. In order to provide consistent management of QOS values, the JmsTemplate must, therefore, be specifically enabled to use its own QOS values by setting the boolean property isExplicitQosEnabled to true.

For convenience, JmsTemplate also exposes a basic request-reply operation that allows for sending a message and waiting for a reply on a temporary queue that is created as part of the operation.

Instances of the JmsTemplate class are thread-safe, once configured. This is important, because it means that you can configure a single instance of a JmsTemplate and then safely inject this shared reference into multiple collaborators. To be clear, the JmsTemplate is stateful, in that it maintains a reference to a ConnectionFactory, but this state is not conversational state.

As of Spring Framework 4.1, JmsMessagingTemplate is built on top of JmsTemplate and provides an integration with the messaging abstraction — that is, org.springframework.messaging.Message. This lets you create the message to send in a generic manner.

Connections

The JmsTemplate requires a reference to a ConnectionFactory. The ConnectionFactory is part of the JMS specification and serves as the entry point for working with JMS. It is used by the client application as a factory to create connections with the JMS provider and encapsulates various configuration parameters, many of which are vendor-specific, such as SSL configuration options.

When using JMS inside an EJB, the vendor provides implementations of the JMS interfaces so that they can participate in declarative transaction management and perform pooling of connections and sessions. In order to use this implementation, Java EE containers typically require that you declare a JMS connection factory as a resource-ref inside the EJB or servlet deployment descriptors. To ensure the use of these features with the JmsTemplate inside an EJB, the client application should ensure that it references the managed implementation of the ConnectionFactory.

Caching Messaging Resources

The standard API involves creating many intermediate objects. To send a message, the following 'API' walk is performed:

ConnectionFactory->Connection->Session->MessageProducer->send

Between the ConnectionFactory and the Send operation, three intermediate objects are created and destroyed. To optimize the resource usage and increase performance, Spring provides two implementations of ConnectionFactory.

Using SingleConnectionFactory

Spring provides an implementation of the ConnectionFactory interface, SingleConnectionFactory, that returns the same Connection on all createConnection() calls and ignores calls to close(). This is useful for testing and standalone environments so that the same connection can be used for multiple JmsTemplate calls that may span any number of transactions. SingleConnectionFactory takes a reference to a standard ConnectionFactory that would typically come from JNDI.

Using CachingConnectionFactory

The CachingConnectionFactory extends the functionality of SingleConnectionFactory and adds the caching of Session, MessageProducer, and MessageConsumer instances. The initial cache size is set to 1. You can use the sessionCacheSize property to increase the number of cached sessions. Note that the number of actual cached sessions is more than that number, as sessions are cached based on their acknowledgment mode, so there can be up to four cached session instances (one for each acknowledgment mode) when sessionCacheSize is set to one . MessageProducer and MessageConsumer instances are cached within their owning session and also take into account the unique properties of the producers and consumers when caching. MessageProducers are cached based on their destination. MessageConsumers are cached based on a key composed of the destination, selector, noLocal delivery flag, and the durable subscription name (if creating durable consumers).

Destination Management

Destinations, as ConnectionFactory instances, are JMS administered objects that you can store and retrieved in JNDI. When configuring a Spring application context, you can use the JNDI JndiObjectFactoryBean factory class or <jee:jndi-lookup> to perform dependency injection on your object’s references to JMS destinations. However, this strategy is often cumbersome if there are a large number of destinations in the application or if there are advanced destination management features unique to the JMS provider. Examples of such advanced destination management include the creation of dynamic destinations or support for a hierarchical namespace of destinations. The JmsTemplate delegates the resolution of a destination name to a JMS destination object that implements the DestinationResolver interface. DynamicDestinationResolver is the default implementation used by JmsTemplate and accommodates resolving dynamic destinations. A JndiDestinationResolver is also provided to act as a service locator for destinations contained in JNDI and optionally falls back to the behavior contained in DynamicDestinationResolver.

Quite often, the destinations used in a JMS application are only known at runtime and, therefore, cannot be administratively created when the application is deployed. This is often because there is shared application logic between interacting system components that create destinations at runtime according to a well-known naming convention. Even though the creation of dynamic destinations is not part of the JMS specification, most vendors have provided this functionality. Dynamic destinations are created with a user-defined name, which differentiates them from temporary destinations, and are often not registered in JNDI. The API used to create dynamic destinations varies from provider to provider since the properties associated with the destination are vendor-specific. However, a simple implementation choice that is sometimes made by vendors is to disregard the warnings in the JMS specification and to use the method TopicSession createTopic(String topicName) or the QueueSession createQueue(String queueName) method to create a new destination with default destination properties. Depending on the vendor implementation, DynamicDestinationResolver can then also create a physical destination instead of only resolving one.

The boolean property pubSubDomain is used to configure the JmsTemplate with knowledge of what JMS domain is being used. By default, the value of this property is false, indicating that the point-to-point domain, Queues, is to be used. This property (used by JmsTemplate) determines the behavior of dynamic destination resolution through implementations of the DestinationResolver interface.

You can also configure the JmsTemplate with a default destination through the property defaultDestination. The default destination is with send and receive operations that do not refer to a specific destination.

Message Listener Containers

One of the most common uses of JMS messages in the EJB world is to drive message-driven beans (MDBs). Spring offers a solution to create message-driven POJOs (MDPs) in a way that does not tie a user to an EJB container. (See jms-receiving-async for detailed coverage of Spring’s MDP support.) Since Spring Framework 4.1, endpoint methods can be annotated with @JmsListener — see jms-annotated for more details.

A message listener container is used to receive messages from a JMS message queue and drive the MessageListener that is injected into it. The listener container is responsible for all threading of message reception and dispatches into the listener for processing. A message listener container is the intermediary between an MDP and a messaging provider and takes care of registering to receive messages, participating in transactions, resource acquisition and release, exception conversion, and so on. This lets you write the (possibly complex) business logic associated with receiving a message (and possibly respond to it), and delegates boilerplate JMS infrastructure concerns to the framework.

There are two standard JMS message listener containers packaged with Spring, each with its specialized feature set.

Using SimpleMessageListenerContainer

This message listener container is the simpler of the two standard flavors. It creates a fixed number of JMS sessions and consumers at startup, registers the listener by using the standard JMS MessageConsumer.setMessageListener() method, and leaves it up the JMS provider to perform listener callbacks. This variant does not allow for dynamic adaption to runtime demands or for participation in externally managed transactions. Compatibility-wise, it stays very close to the spirit of the standalone JMS specification, but is generally not compatible with Java EE’s JMS restrictions.

While SimpleMessageListenerContainer does not allow for participation in externally managed transactions, it does support native JMS transactions. To enable this feature, you can switch the sessionTransacted flag to true or, in the XML namespace, set the acknowledge attribute to transacted. Exceptions thrown from your listener then lead to a rollback, with the message getting redelivered. Alternatively, consider using CLIENT_ACKNOWLEDGE mode, which provides redelivery in case of an exception as well but does not use transacted Session instances and, therefore, does not include any other Session operations (such as sending response messages) in the transaction protocol.
The default AUTO_ACKNOWLEDGE mode does not provide proper reliability guarantees. Messages can get lost when listener execution fails (since the provider automatically acknowledges each message after listener invocation, with no exceptions to be propagated to the provider) or when the listener container shuts down (you can configure this by setting the acceptMessagesWhileStopping flag). Make sure to use transacted sessions in case of reliability needs (for example, for reliable queue handling and durable topic subscriptions).
Using DefaultMessageListenerContainer

This message listener container is used in most cases. In contrast to SimpleMessageListenerContainer, this container variant allows for dynamic adaptation to runtime demands and is able to participate in externally managed transactions. Each received message is registered with an XA transaction when configured with a JtaTransactionManager. As a result, processing may take advantage of XA transaction semantics. This listener container strikes a good balance between low requirements on the JMS provider, advanced functionality (such as participation in externally managed transactions), and compatibility with Java EE environments.

You can customize the cache level of the container. Note that, when no caching is enabled, a new connection and a new session is created for each message reception. Combining this with a non-durable subscription with high loads may lead to message loss. Make sure to use a proper cache level in such a case.

This container also has recoverable capabilities when the broker goes down. By default, a simple BackOff implementation retries every five seconds. You can specify a custom BackOff implementation for more fine-grained recovery options. See api-spring-framework/util/backoff/ExponentialBackOff.html[ExponentialBackOff] for an example.

Like its sibling (SimpleMessageListenerContainer), DefaultMessageListenerContainer supports native JMS transactions and allows for customizing the acknowledgment mode. If feasible for your scenario, This is strongly recommended over externally managed transactions — that is, if you can live with occasional duplicate messages in case of the JVM dying. Custom duplicate message detection steps in your business logic can cover such situations — for example, in the form of a business entity existence check or a protocol table check. Any such arrangements are significantly more efficient than the alternative: wrapping your entire processing with an XA transaction (through configuring your DefaultMessageListenerContainer with an JtaTransactionManager) to cover the reception of the JMS message as well as the execution of the business logic in your message listener (including database operations etc).
The default AUTO_ACKNOWLEDGE mode does not provide proper reliability guarantees. Messages can get lost when listener execution fails (since the provider automatically acknowledges each message after listener invocation, with no exceptions to be propagated to the provider) or when the listener container shuts down (you can configure this by setting the acceptMessagesWhileStopping flag). Make sure to use transacted sessions in case of reliability needs (for example, for reliable queue handling and durable topic subscriptions).

Transaction Management

Spring provides a JmsTransactionManager that manages transactions for a single JMS ConnectionFactory. This lets JMS applications leverage the managed-transaction features of Spring, as described in Transaction Management section of the Data Access chapter. The JmsTransactionManager performs local resource transactions, binding a JMS Connection/Session pair from the specified ConnectionFactory to the thread. JmsTemplate automatically detects such transactional resources and operates on them accordingly.

In a Java EE environment, the ConnectionFactory pools Connection and Session instances, so those resources are efficiently reused across transactions. In a standalone environment, using Spring’s SingleConnectionFactory result in a shared JMS Connection, with each transaction having its own independent Session. Alternatively, consider the use of a provider-specific pooling adapter, such as ActiveMQ’s PooledConnectionFactory class.

You can also use JmsTemplate with the JtaTransactionManager and an XA-capable JMS ConnectionFactory to perform distributed transactions. Note that this requires the use of a JTA transaction manager as well as a properly XA-configured ConnectionFactory. (Check your Java EE server’s or JMS provider’s documentation.)

Reusing code across a managed and unmanaged transactional environment can be confusing when using the JMS API to create a Session from a Connection. This is because the JMS API has only one factory method to create a Session, and it requires values for the transaction and acknowledgment modes. In a managed environment, setting these values is the responsibility of the environment’s transactional infrastructure, so these values are ignored by the vendor’s wrapper to the JMS Connection. When you use the JmsTemplate in an unmanaged environment, you can specify these values through the use of the properties sessionTransacted and sessionAcknowledgeMode. When you use a PlatformTransactionManager with JmsTemplate, the template is always given a transactional JMS Session.