JNDI Datasource?

This may be a stupid question but I really need a good solid answer for
this.

Does a JNDI lookup of a Resource defined in Tomcat server.xml
configuration actually "initiate a pool object"/"return the ref for an
existing one" or is it simply a configuration for the pool, and the
program who calls the .lookup initiates a new pool each time?

Ex-code:

pool =3D (DataSource)env.lookup("jdbc/pool");

PS: I might be missing something because we have our production apps not
functioning properly and I seem to be under the gun.

-Erdem

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