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Support for JCA Message Endpoints
Beginning with version 2.5, Spring also provides support for a JCA-based
MessageListener
container. The JmsMessageEndpointManager
tries to
automatically determine the ActivationSpec
class name from the provider’s
ResourceAdapter
class name. Therefore, it is typically possible to provide
Spring’s generic JmsActivationSpecConfig
, as the following example shows:
<bean class="org.springframework.jms.listener.endpoint.JmsMessageEndpointManager">
<property name="resourceAdapter" ref="resourceAdapter"/>
<property name="activationSpecConfig">
<bean class="org.springframework.jms.listener.endpoint.JmsActivationSpecConfig">
<property name="destinationName" value="myQueue"/>
</bean>
</property>
<property name="messageListener" ref="myMessageListener"/>
</bean>
Alternatively, you can set up a JmsMessageEndpointManager
with a given
ActivationSpec
object. The ActivationSpec
object may also come from a JNDI lookup
(using <jee:jndi-lookup>
). The following example shows how to do so:
<bean class="org.springframework.jms.listener.endpoint.JmsMessageEndpointManager">
<property name="resourceAdapter" ref="resourceAdapter"/>
<property name="activationSpec">
<bean class="org.apache.activemq.ra.ActiveMQActivationSpec">
<property name="destination" value="myQueue"/>
<property name="destinationType" value="jakarta.jms.Queue"/>
</bean>
</property>
<property name="messageListener" ref="myMessageListener"/>
</bean>
Using Spring’s ResourceAdapterFactoryBean
, you can configure the target ResourceAdapter
locally, as the following example shows:
<bean id="resourceAdapter" class="org.springframework.jca.support.ResourceAdapterFactoryBean">
<property name="resourceAdapter">
<bean class="org.apache.activemq.ra.ActiveMQResourceAdapter">
<property name="serverUrl" value="tcp://localhost:61616"/>
</bean>
</property>
<property name="workManager">
<bean class="org.springframework.jca.work.SimpleTaskWorkManager"/>
</property>
</bean>
The specified WorkManager
can also point to an environment-specific thread pool — typically through a SimpleTaskWorkManager
instance’s asyncTaskExecutor
property.
Consider defining a shared thread pool for all your ResourceAdapter
instances
if you happen to use multiple adapters.
In some environments, you can instead obtain the entire ResourceAdapter
object from JNDI
(by using <jee:jndi-lookup>
). The Spring-based message listeners can then interact with
the server-hosted ResourceAdapter
, which also use the server’s built-in WorkManager
.
See the javadoc for JmsMessageEndpointManager
,
JmsActivationSpecConfig
,
and ResourceAdapterFactoryBean
for more details.
Spring also provides a generic JCA message endpoint manager that is not tied to JMS:
org.springframework.jca.endpoint.GenericMessageEndpointManager
. This component allows
for using any message listener type (such as a JMS MessageListener
) and any
provider-specific ActivationSpec
object. See your JCA provider’s documentation to
find out about the actual capabilities of your connector, and see the
GenericMessageEndpointManager
javadoc for the Spring-specific configuration details.
JCA-based message endpoint management is very analogous to EJB 2.1 Message-Driven Beans. It uses the same underlying resource provider contract. As with EJB 2.1 MDBs, you can use any message listener interface supported by your JCA provider in the Spring context as well. Spring nevertheless provides explicit “convenience” support for JMS, because JMS is the most common endpoint API used with the JCA endpoint management contract. |