MDB Accessing datasource

Question

Hi,
I have a question regarding MDBs accessing a datasource. Since application servers create a pool of MDBs that will consume messages, how should the datasource be retrieved efficiently?
public class MDB implements MessageDrivenBean, MessageListener
     private MessageDrivenContext   context = null;
          private DataSource dataSource = null;
     public void ejbCreate()
                    InitialContext initialContext = new InitialContext();
          dataSource = (DataSource) initialContext.
                                                  lookup(lookupstring);
     public void setMessageDrivenContext(MessageDrivenContext context)
           context = context;
     public void onMessage(Message msg)
                Connection connection = dataSource.getConnection();
     public void ejbRemove()
}Since the application server will instantiate a pool of MDBs, the ejbCreate method will be called n times depending on the size of the MDB pool. Each instance of the MDB will have their own instance of the datasource. I want my MDBs to share a single instance of the datasource. How can I do this?
For example, fo servlets, you have an init method which is only called once by the servlet container where you can instantiate a datasource. Subsequent requests to the servlet will create 1 thread for each request. But each thread will only access a single instance of the datasource.
How can i do this with MDBs? Is my code correct or is there a better way? Or is it even a non-issue for application servers. Btw, I'm using JBoss.
Can anyone point to any reading about this or can clarify this?
Thanks in advance :)

Answer 1

Hi Uday
Configuration link for Sender Adapter
<b>http://help.sap.com/saphelp_nw04/helpdata/en/7e/5df96381ec72468a00815dd80f8b63/content.htm</b>
Configuration link of Reciever Adapter
<b>http://help.sap.com/saphelp_nw04/helpdata/en/64/ce4e886334ec4ea7c2712e11cc567c/content.htm</b>
XML Document Format for the Message Protocol XML SQL Format
<b>http://help.sap.com/saphelp_nw04/helpdata/en/2e/96fd3f2d14e869e10000000a155106/content.htm</b>
Hope it helps.For further doubts u are free to post
Regards
Arpit Seth