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Object Relational Mapping Tools... Best Free Ones out there?

 
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Hi,

We've been using the same Object Relational Mapping tool for years now (TopLink) but because lack of support by Oracle we're considering looking at some other tools. I'm looking for some opinion/feedback on what some of the best FREE technologies there are out there?

Thank you.
 
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Look at Hibernate.. It's widely accepted, there are books on it, it includes caching, automated facilities, open source gui's and the like. Also it's not as invasive as toplink is.
 
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You might find it useful to read this blog entry on Choosing a Data Persistence Strategy:

http://www.codefutures.com/weblog/andygrove/archives/2005/01/choosing_a_java.html

You did not say whether you just wished to find something for future projects or if you also need to retrofit the solution back into existing applications. That could have a big impact on your technology choice.

Also, you did not say if you have used DAOs in your existing architecture, which will make changing your persistence technology choice much easier.
 
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