Why does Context.INITIAL_CONTEXT_FACTORY has to be vendor specific?

I have a standalone Java app that reads messages from a JMS queue, and when I create a InitialContext, I give it the property Context.INITIAL_CONTEXT_FACTORY = weblogic.jndi.WLInitialContextFactory.
Why? I mean, should I as a client not be able to connect to any JMS queue without any knowledge about what vendor this JMS server runs on? Can I give it some Sun standard factory instead that will work?
Thank you
Søren

The problem here is JMS is not a protocol specification like say SOAP, in which the size and format of every message is well defined, written in stone. Neither is JDBC nor JPA, they are just API specifications. We are given a library of interfaces to which we program, and every vendor will give us a concealed form of their implementation. Because of that, there is some point in every one of those APIs where we must specify the implementing clasess, which are free to define their own implementation.
Does this answer your question? Hope it has been useful.
Regards
Jorge

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Why does Context.INITIAL_CONTEXT_FACTORY has to be vendor specific?

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