Configure an activation spec for the default messaging provider

Configure a JMS activation spec to enable a message-driven bean to communicate with the default messaging provider.

You create a JMS activation spec if you want to use a message-driven bean to communicate with the default messaging provider through Java™ EE Connector Architecture (JCA) 1.5. JCA provides Java connectivity between appservers such as WAS, and enterprise information systems. It provides a standardized way of integrating JMS providers with Java EE appservers, and provides a framework for exchanging data with enterprise systems, where data is transferred in the form of messages.

One or more message-driven beans can share a single JMS activation specification.

Because a JMS activation spec is a group of messaging configuration properties not a component, it cannot be manually started and stopped. For this reason, to prevent a message-driven bean from processing messages complete the following tasks:

• Stop the application that contains the message-driven bean.

• Stop the messaging engine.

All the activation spec configuration properties apart from Name, JNDI name, Destination JNDI name, and Authentication alias are overridden by appropriately named activation-configuration properties in the deployment descriptor of an associated EJB 2.1 or later message-driven bean. For an EJB 2.0 message-driven bean, the Destination type, Subscription durability, Acknowledge mode and Message selector properties are overridden by the corresponding elements in the deployment descriptor. For either type of bean the Destination JNDI name property can be overridden by a value specified in the message-driven bean bindings.

 

1. Start the admin console.

2. Display the default messaging provider. In the navigation pane, expand Resources > JMS > JMS providers .

3. Select the default provider for which you want to configure an activation specification.

4.  
   Change the Scope check box to the scope level at which the activation spec is to be visible to applications, according to the needs.

5. In the content pane, under the Additional properties heading, click Activation specifications. This lists any existing JMS activation specifications for the default messaging provider in the content pane.

6. Display the properties of the JMS activation specification. To display an existing activation specification, click one of the names listed.Alternatively, if you want to create a new activation specification, click New, then specify the following required properties:

   
   Name

   Type the name by which the activation spec is known for administrative purposes.

   
   JNDI name

   Type the JNDI name that is used to bind the activation specification into the JNDI namespace.

   
   Destination type

   Whether the message-driven bean uses a queue or topic destination.

   
   Destination JNDI name

   Type the JNDI name that the message-driven bean uses to look up the JMS destination in the JNDI namespace.

   Select the type of destination on the Destination type property.

   
   Bus name

   The name of the bus to connect to.

   Specify the name of the service integration bus to which connections are made. This must be the name of the bus on which the bus destination identified by the Destination JNDI name property is defined.

   You can either select an existing bus or type the name of another bus. If you type the name of a bus that does not exist, create and configure that bus before the activation spec can be used.

7. Specify properties for the JMS activation specification, according to the needs.

8.  
   Specify the JMS activation specification connection properties that influence how the default messaging provider chooses the messaging engine to which the message-driven bean application connects. By default, the environment automatically connects applications to an available messaging engine on the bus. However we can specify extra configuration details to influence the connection process; for example to identify special bootstrap servers, or to limit connection to a subgroup of available messaging engines, or to improve availability or performance, or to ensure sequential processing of messages received. For information about why and how to do this, see How JMS applications connect to a messaging engine on a bus.

9. Click OK.

10. Save the changes to the master configuration.