How does J2EE SDK provide JNDI DataSource ?

Still new to J2EE and working my way thorugh Wrox press "professional java server programming". Im using the deploy tool and im wondering how does J2EE provide JNDI names for a DataSource ? Im somewhat familiar with JNDI and I thought you had to use a directory service such as OpenLDAP to use JNDI.
my questions then are:
(1) What kinds of things can you do with JNDI without using a directory service ?
(2) How does the J2EE SDK physically store references to a DataSource without using a directory service. In otherwords, how does the J2EE server provide for using JNDI names for a DataSource and is this a typical feature of J2EE containers ?

i wish someone would answer this. i curious myself about these exact same things.

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I am just pasting some contents regarding this. This may solve ur doubt
Obtaining the InitialContext Using the Client's Environment
The properties can be initialized in the client's environment, thus avoiding the need to hardcode the values for these properties inside the client's code. To do this, the following environment variables must be set. If any of the properties isn't set, its default value (if any) is assumed:
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How do I use a JNDI datasource in my application?

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I see what you are saying.
The JNDI approach should work-we will try to reproduce this internally.
I would recommend leveraging the OSGi service registry, instead of using JNDI, however. The Event Server is a modular server based on OSGi, so one should use the OSGi service registry whenever possible instead of using the jndi registry. Jndi is primarily there to support legacy code that requires Jndi.
Any data sources that you configure are automatically registered in the OSGi service registry. When there is more than one data source they can be distinguished using their name.
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http://www.springframework.org/osgi/specification
(Look in section 3.3)
Hope that helps.
Seth
Edited by swhite at 08/01/2007 6:19 PM

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How does J2EE SDK provide JNDI DataSource ?

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