support Spring for configuration of the JMS client side as well as forJMS Message Broker

http://activemq.apache.org/spring-support.html

We fully support Spring for configuration of the JMS client side as well as for configuring the JMS Message Broker.

There is a great
article on using Spring with ActiveMQ - I'd recommend reading it first.

Configuring the JMS client

To configure an ActiveMQ JMS client in Spring it is just a simple matter of configuring an instance of ActiveMQConnectionFactory within a standard Spring XML configuration file like any other bean. There are

several examples and test cases available and
this one shows how to construct an ActiveMQConnectionFactory in Spring which is then passed into a Spring JmsTemplate for use by some POJOs.

e.g. the following fragment of XML shows us creating a JMS connection factory for ActiveMQ connecting to a remote broker on a specific host name and port.

<bean id="jmsFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL">
<value>tcp://localhost:61616</value>
</property>
</bean>

The following shows how to use Zeroconf to discover the available brokers to connect to.

<bean id="jmsFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL">
<value>zeroconf://_activemq.broker.development.</value>
</property>
</bean>

From 1.1 of ActiveMQ onwards you can also use JNDI to configure ActiveMQ within Spring.

This example shows how to configure Spring using ActiveMQ's
JNDI Support.

Using Spring 2.0

If you are using the new
XML Schema-based configuration of Spring 2.0 and ActiveMQ 4.1 or later (and xbean-spring 2.6 or later) you can embed the ActiveMQ broker XML inside any regular Spring.xml file without requiring the above factory bean. e.g. here is an

example of a regular Spring XML file in Spring 2.0 which also configures a broker.

<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:amq="http://activemq.apache.org/schema/core"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 
<!--  lets create an embedded ActiveMQ Broker -->
<amq:broker useJmx="false" persistent="false">
<amq:transportConnectors>
<amq:transportConnector uri="tcp://localhost:0" />
</amq:transportConnectors>
</amq:broker>

<!--  ActiveMQ destinations to use  -->
<amq:queue id="destination"  physicalName="org.apache.activemq.spring.Test.spring.embedded"/>

<!-- JMS ConnectionFactory to use, configuring the embedded broker using XML -->
<amq:connectionFactory id="jmsFactory" brokerURL="vm://localhost"/>

<!-- Spring JMS Template -->
<bean id="myJmsTemplate" class="org.springframework.jms.core.JmsTemplate">
<property name="connectionFactory">
<!-- lets wrap in a pool to avoid creating a connection per send -->
<bean class="org.springframework.jms.connection.SingleConnectionFactory">
<property name="targetConnectionFactory">
<ref local="jmsFactory" />
</property>
</bean>
</property>
</bean>

<bean id="consumerJmsTemplate" class="org.springframework.jms.core.JmsTemplate">
<property name="connectionFactory" ref="jmsFactory"/>
</bean>

<!-- a sample POJO which uses a Spring JmsTemplate -->
<bean id="producer" class="org.apache.activemq.spring.SpringProducer">
<property name="template">
<ref bean="myJmsTemplate"></ref>
</property>

<property name="destination">
<ref bean="destination" />
</property>

<property name="messageCount">
<value>10</value>
</property>
</bean>

<!-- a sample POJO consumer -->
<bean id="consumer" class="org.apache.activemq.spring.SpringConsumer">
<property name="template" ref="consumerJmsTemplate"/>
<property name="destination" ref="destination"/>
</bean>

</beans>

This allows you to configure JMS artifacts like destinations and connection factories together with the entire broker.

Working with Spring's JmsTemplate

Spring supports a handy abstraction, JmsTemplate, which allows you to hide some of the lower level JMS details when sending messages etc.

Please be aware that there are a number of
JmsTemplate Gotchas to be careful of.

One thing to bear in mind with JmsTemplate is that by default it will create a new connection, session, producer for each message sent - then close them all down again. This is very inefficient! It is done like this to work in EJB containers which tend to
use a special ConnectionFactory which does pooling.

If you are not using a JCA container to manage your JMS connections, we recommend you use our pooling JMS connection provider, (org.apache.activemq.pool.PooledConnectionFactory) from the
activemq-pool library, which will pool the JMS resources to work efficiently with Spring's JmsTemplate or with EJBs.

e.g.

<!-- a pooling based JMS provider -->
<bean id="jmsFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop">
<property name="connectionFactory">
<bean class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL">
<value>tcp://localhost:61616</value>
</property>
</bean>
</property>
</bean>

<!-- Spring JMS Template -->
<bean id="myJmsTemplate" class="org.springframework.jms.core.JmsTemplate">
<property name="connectionFactory">
<ref local="jmsFactory"/>
</property>
</bean>

The PooledConnectionFactory supports the pooling of Connection, Session and MessageProducer instances so it can be used with tools like

Camel and Spring's
JmsTemplate and MessagListenerContainer . Connections, sessions and producers are returned to a pool after use so that they can be reused later without having to undergo the cost of creating them again.

Note: while the PooledConnectionFactory does allow the creation of a collection of active consumers, it does not 'pool' consumers. Pooling makes sense for connections, sessions and producers, which can be seldom-used resources, are expensive to
create and can remain idle a minimal cost. Consumers, on the other hand, are usually just created at startup and left going, handling incoming messages as they come. When a consumer is complete, it's preferred to shut down it down rather than leave it idle
and return it to a pool for later reuse: this is because, even if the consumer is idle, ActiveMQ will keep delivering messages to the consumer's prefetch buffer, where they'll get held up until the consumer is active again.

If you are creating a collection of consumers (for example, for multi-threaded message consumption), you should consider keeping a low prefetch value (e.g. 10 or 20), to ensure that all messages don't end up going to just one of the consumers.

We do also have a pooling JMS ConnectionFactory for use inside a JCA / MDB container (org.apache.activemq.ra.InboundConnectionProxyFactory), when using our JCA Resource Adapter which will reuse the same JMS connection/session which is being used for inbound
messages.

Consuming JMS from inside Spring

Spring's
MessagListenerContainer should be used for message consumption. This provides all the power of MDBs - efficient JMS consumption and pooling of the message listeners - but without requiring a full EJB container.

You can use the activemq-pool org.apache.activemq.pool.PooledConnectionFactory for efficient pooling of the connections and sessions for your collection of consumers, or you can use the Spring JMS
org.springframework.jms.connection.CachingConnectionFactory to achieve the same effect.

Using an embedded broker

To create an embedded broker inside Spring its easiest to do it explicitly as follows...

<bean id="broker" class="org.apache.activemq.xbean.BrokerFactoryBean">
<property name="config" value="classpath:org/activemq/xbean/activemq.xml" />
<property name="start" value="true" />
</bean>

The referenced config file uses the
Xml Configuration mechanism.

Using VM Transport Note that in ActiveMQ 4.x or later if you configure the ActiveMQConnectionFactory with the vm: transport then you do not have to configure an embedded broker explicitly - one will be auto-created for you - unless you wish to explicitly configure the transports and persistence options used on the embedded broker.

More Information

Also check out the following blogs for information about using Spring JMS with ActiveMQ:

Synchronous Request Response with ActiveMQ and Spring

Using Spring to Send JMS Messages

Using Spring to Receive JMS Messages

Tuning JMS Message Consumption In Spring