WebSphere Business Integration Adapters: An Adapter Development and WebSphere Business Integration Solution

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31.2.2 Generating the MDB

A message-driven bean (MDB) is a special kind of bean that gets called by the

JMS services in WebSphere Application Server when a message arrives in a

queue. Usually, the MDB does not do any business logic. It calls another bean to

process the actual message data.

In our scenario, we have the WSDL for the incoming message, and we have

WSDL for the EJB that needs to process the message. The generation of the

MDB uses both sets of WSDL files. To generate the MDB:

1. Locate the file RM_MaintenanceAgentDeliveryEJBService.wsdl in the

deployable service project Process_StartEJB. Right-click this WSDL file and

select Enterprise Services → Generate Deploy Code.

2. Select the option to use an existing port for the inbound message. Click Next.

Figure 31-36 Generate deploy code for an existing port

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3. Point to the WSDL of the existing port, which is the WSDL of the EJB. Click

Browse.

4. Select the correct WSDL file (Figure 31-37) and click OK.

Figure 31-37 Select the inbound WSDL

5. The next window shows an error. Select the port that matches with the port in

the EJB WSDL. Select the Agent Delivery port.

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Figure 31-38 Select correct port

6. Click Finish in the next window (Figure 31-39 on page 797).

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Figure 31-39 MDB generation

7. A new project Process_StartEJBEJB has been created. Correct again the

library error.

8. An MDB uses a number of resources, for which you need to change the JNDI

names. Locate the MDB and open the EJB deployment descriptor.

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Figure 31-40 MDB in EJB project

9. In the EJB deployment descriptor editor, select the Beans tab.

10.Select the MDB itself and change the value of the listener port (Figure 31-41

on page 799).