Why use Datasource & JNDI

Question

HI
I am novice to the JNDI. I searched a few documents but did not find a right anwser. my question is , why do we need DataSource through JNDI. I think we need it to connect diffreent kind of resources. but think of a situation where my JDBC connetionpooling class resides on same JVM that of my application. in this case do I need to use datasource & JNDI name then bind it to the class or I can use the class directly by passing JNDI.
which one will be better & why

Answer 1

Hi,
The nice thing about JNDI is that you can write your application in a way that is independent of the details needed to setup and connect (user, passwd, URL, drivername etc) to the database.
In a typical J2EE server, the setup is done by a human administrator, using the appserver tools. This administrator needs to have little or no knowledge about your application, simply because the setup and the usage of the drivers are cleanly separated through JNDI in the middle.
In turn, your application can be perfectly portable across different servers, different databases with different drivers and user accounts, and you don't need to change your code in order to do that (at least not in principle).
Even if your application runs in the same VM, there are some virtues to this separation.
Best,
Guy
http://www.atomikos.com - JTA, JNDI and DataSource support for J2SE, J2EE and Tomcat