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by mwnorman2
3281 days ago
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I was part of the team that developed TopLink, later EclipseLink that became the reference implementation of JPA. After I left Oracle, almost all of the original 30+ Engineers/QA/Managers were moved to a different project. The git-repo is infrequently updated by only a few support Engineers. From my point-of-view this means that the de-facto Java ORM is Hibernate (even though we were first!). It is very mature, well-tested yet still getting some 'love' (c.f. recent changes for Java 8 streams). Other posters have mentioned the 'Vietnam of CS' post from many years ago - the main message I would like to highlight is that ORM's are deceptive: it appears easy to create one, but once you spend some time with how people actually use databases, the real-world starts to drag you down (the 'leaky abstraction' meme thrown around). An example of this is: how many ways are there to map a One-to-One relationship (hint: greater than 5) |
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See slides 20, 21 and 22: http://images.slideplayer.com/9/2645248/slides/slide_20.jpg