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Would this patch be accepted and integrated into future hibernate releases ?
No promises. Depends how upon elegantly it was implemented, and upon whether the extra complexity was "worth it".
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Which formal steps do I have to proceed?
There is no formal procedure. It helps to propose new functionality to the devel list first, just to check that we think it is not a Bad Idea.
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Any coding conventions?
There is a checkstyle ant task
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Any testing conventions?
New functionality should be accompanied by unit tests, of course. The test should extend net.sf.hibernate.test.TestCase
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And in the end I have to submit the patch to jira, and if it is written correctly it will be integrated into future releases, true?
Only if we like it. :)