From: <glassfish_at_javadesktop.org>
Date: Tue, 01 Jul 2008 07:46:24 PDT

Persistence.createEntityManagerFactory is the bootstrap method intended to be used in Java SE environment.

In Java EE environment, emf can be obtained via injection or lookup, and since it's provided by the container, it can be associated with container transaction.

-cheng
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