i don't have any of those concrete national numbers you are asking for, but since you mention you could get another technology in without having to go through a similar experience let me present you with this taken from the 2 techs forums:
Spring: Threads: 12,485, Posts: 49,721, Members: 8,364
Hibernate: Threads: 31,107 Posts: 119,455, Members: 20,008
so if we use numbers alone hibernate is 250% bigger than spring...
and mind you the growth has only been rising since the forum started.
ORM's like Hibernate/EJB3 have probably never been bigger as it is now and in the future (and the same can be said about technologies like spring)
But as with any technology, evaluate if it is a good use for the problem you need to solve; don't just look on trends/numbers etc. take an educated decision. Read the docs, try it and understand it in your application context.
_________________ Max
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