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Do JNDI Lookups Remove Portability?

 
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I deployed my first EJB the other day, and noticed there wasn't a JNDI entry in the ejb-jar.xml file for the EJB I deployed. Yet my java client can look up this bean through JNDI. Then I noticed that the JNDI name was specified in the file sun-j2ee-ri.xml...which obviously isn't part of the specification.

So is every JNDI name registered differently depending on the vendor?

If I write an application with JSP's/Servlets and EJBs and throw them in an EAR, does this mean if I change app servers I am going to have to re-register all the JNDI names with the new app server?

What does <ejb-ref> have to do with all of this?

Thanks
James
 
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