I love the analogy to GWT and suffered it first hand - we believed the hype, that we didn’t need to learn JavaScript - but in the end we ended up needing to ful

I love the analogy to GWT and suffered it first hand - we believed the hype, that we didn’t need to learn JavaScript - but in the end we ended up needing to fully understand the whole stack in order to work through edge cases. I don’t mind leaky abstractions but the killer with JPA was the cache. IIRC, mixing pure SQL with JPA was really tricky because you’d end up with cache inconsistencies. So the JPA abstraction was leaky but the the framework effectively assumed that it wasn’t, which lead to all kinds for workarounds.