I searched a lot before asking but I can't find any reason ! In all comparison I found that Hibernate is better than OpenJPA !
Even in your blog, there's always answers about HOW ? But no the answer for WHY ? http://wagner-sebastian com/wordpress/2011/08/19/openmeetings-migrating-to-openjpa-and-tighter-spring integration/ Also in this long discussion : Hibernate migration strategy Was: [PROPOSAL][VOTE] OpenMeetings http://web.archiveorange.com/archive/v/gY4YJlEmniWxuZol4SIc
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