JMS Transport

The Java Message Service (JMS) transport implementation also comes from the WS-Commons Transports project. All the relevant classes are packed into the axis2-transport-jms-<version>.jar and the following classes act as the transport receiver and the sender respectively.

org.apache.axis2.transport.jms.JMSListener
org.apache.axis2.transport.jms.JMSSender

The JMS transport implementation requires an active JMS server instance to be able to receive and send messages. We recommend using Apache ActiveMQ JMS server, but other implementations such as Apache Qpid and Tibco are also supported. You also need to put the client JARs for your JMS server in Carbon classpath. In case of Apache ActiveMQ, you need to put the following JARs in the classpath:

activemq-core.jar
geronimo-j2ee-management_1.0_spec-1.0.jar
geronimo-jms_1.1_spec-1.1.1.jar

These JAR files can be obtained by downloading the latest version of Apache ActiveMQ (version 5.2.0 or later is recommended). Extract the downloaded archive and find the required dependencies in the $ACTIVEMQ_HOME/lib directory. You need to copy these JAR files over to $CARBON_HOME/repository/components/lib directory for Carbon to be able to pick them up at runtime.

Configuration parameters for JMS receiver and the sender are XML fragments that represent JMS connection factories. A typical JMS parameter configuration would look like this:

<parameter name="myTopicConnectionFactory">
      <parameter name="java.naming.factory.initial">org.apache.activemq.jndi.ActiveMQInitialContextFactory</parameter>
      <parameter name="java.naming.provider.url">tcp://localhost:61616</parameter>
      <parameter name="transport.jms.ConnectionFactoryJNDIName">TopicConnectionFactory</parameter>
      <parameter name="transport.jms.ConnectionFactoryType">topic</parameter>
</parameter>

This is a bare minimal JMS connection factory configuration which consists of four connection factory parameters. JMS connection factory parameters are described in detail below.

JMS Connection Factory Parameters

Tip

In transport parameter tables, literals displayed in italic mode under the "Possible Values" column should be considered as fixed literal constant values. Those values can be directly put in transport configurations.

Parameter Name	Description	Required	Possible Values	Default Value
java.naming.factory.initial	JNDI initial context factory class. The class must implement the `java.naming.spi.InitialContextFactory` interface.	Yes	A valid class name
java.naming.provider.url	URL of the JNDI provider.	Yes	A valid URL
java.naming.security.principal	JNDI Username.	No
java.naming.security.credentials	JNDI password.	No
transport.Transactionality	Desired mode of transactionality.	No	none, local, jta	none
transport.UserTxnJNDIName	JNDI name to be used to require user transaction.	No		java:comp/UserTransaction
transport.CacheUserTxn	Whether caching for user transactions should be enabled or not.	No	true, false	true
transport.jms.SessionTransacted	Whether the JMS session should be transacted or not.	No	true, false	true if transactionality is 'local'
transport.jms.SessionAcknowledgement	JMS session acknowledgment mode.	No	AUTO_ACKNOWLEDGE, CLIENT_ACKNOWLEDGE, DUPS_OK_ACKNOWLEDGE, SESSION_TRANSACTED	AUTO_ACKNOWLEDGE
transport.jms.ConnectionFactoryJNDIName	The JNDI name of the connection factory.	Yes
transport.jms.ConnectionFactoryType	Type of the connection factory.	No	queue, topic	queue
transport.jms.JMSSpecVersion	JMS API version.	No	1.1, 1.0.2b	1.1
transport.jms.UserName	The JMS connection username.	No
transport.jms.Password	The JMS connection password.	No
transport.jms.Destination	The JNDI name of the destination.	No		Defaults to service name
transport.jms.DestinationType	Type of the destination.	No	queue, topic	queue
transport.jms.DefaultReplyDestination	JNDI name of the default reply destination.	No
transport.jms.DefaultReplyDestinationType	Type of the reply destination.	No	queue, topic	Defaults to the type of the destination
transport.jms.MessageSelector	Message selector implementation.	No
transport.jms.SubscriptionDurable	Whether the connection factory is subscription durable or not.	No	true, false	false
transport.jms.DurableSubscriberClientID	The ClientId parameter when using durable subscriptions	Yes if subscription durable is turned on	true, false
transport.jms.DurableSubscriberName	Name of the durable subscriber.	Yes if subscription durable is turned on
transport.jms.PubSubNoLocal	Whether the messages should be published by the same connection they were received.	No	true, false	false
transport.jms.CacheLevel	JMS resource cache level.	No	none, connection, session, consumer, producer, auto	auto
transport.jms.ReceiveTimeout	Time to wait for a JMS message during polling. Set this parameter value to a negative integer to wait indefinitely. Set to zero to prevent waiting.	No	Number of milliseconds to wait	1000 ms
transport.jms.ConcurrentConsumers	Number of concurrent threads to be started to consume messages when polling.	No	Any positive integer - For topics this must be always 1	1
transport.jms.MaxConcurrentConsumers	Maximum number of concurrent threads to use during polling.	No	Any positive integer - For topics this must be always 1	1
transport.jms.IdleTaskLimit	The number of idle runs per thread before it dies out.	No	Any positive integer	10
transport.jms.MaxMessagesPerTask	The maximum number of successful message receipts per thread.	No	Any positive integer - Use -1 to indicate infinity	-1
transport.jms.InitialReconnectDuration	Initial reconnection attempts duration in milliseconds.	No	Any positive integer	10000 ms
transport.jms.ReconnectProgressFactor	Factor by which the reconnection duration will be increased.	No	Any positive integer	2
transport.jms.MaxReconnectDuration	Maximum reconnection duration in milliseconds.	No		3600000 ms (1 hr)
transport.jms.MaxJMSConnections	Maximum cached JMS connections in the producer level.	No	Any positive integer value	10

JMS transport implementation has some parameters that should be configured at service level, in other words in service XML files of individual services.

Service Level JMS Configuration Parameters

Following are some of the common parameters you can set at the service level.

Parameter Name	Description	Required	Possible Values
transport.jms.ConnectionFactory	Name of the JMS connection factory the service should use.	No	A name of an already defined connection factory
transport.jms.PublishEPR	JMS EPR to be published in the WSDL.	No	A JMS EPR
transport.jms.ContentType	Specifies how the transport listener should determine the content type of received messages.	No	A simple string value, in which case the transport listener assumes that the received messages always have the specified content type, or a set of rules. For more information, see http://axis.apache.org/axis2/java/transports/jms.html#Service_configuration.

For more information, see Java Message Service (JMS) Support.