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Whenever I develop a J2EE-Application, I at some point decide to switch from my dummy Persistence (Simply Using Lists and other Data Structures) to some Sort of Database Persistence. Mostly when I hope the Data Model is more or less complete.

From this point on, changes to the data model become exhausting, but unluckily they occur rather often.

I've used different Object-Relational-Mappers (iBatis, Hibernate) for my projects. They definitely reduce the pain coming with Data Model changes, but they anyway let me adjust code/configuration at 3 or 4 places for every single change. To me, that's cumbersome and error prone.

I made a better experience with DB4O, which simply persists Java Objects as they are, but I believe it's performance does not scale for huge applications.

Is there anyway to maintain performance while letting out all the ugly configuration work?

I'm seeking a performant framework which really hides persistence from my code. Wish for thinking? Or am I missing out THE technology?

Hope you can help.

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Perhaps there are open source packages for JPA or Hibernate that can maintain the boilerplate configurations based on the current database schema? I am not aware of any good ones so far, but I was thinking along the lines of EntityFramework in .NET, how you are able to update your model from the database schema. In other words, perhaps a code generation tool of some kind would be beneficial? – maple_shaft♦ Jul 11 '12 at 16:36
There are definitely plenty of tools for hibernate and jpa that generate your entities with annotations from db and vice versa (hibernate tools from jboss). – Eduard Jul 11 '12 at 17:08

closed as off topic by Jarrod Roberson, Walter, Matthieu, Ryathal, Dynamic Sep 20 '12 at 10:27

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1 Answer

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I think that you shoul have a look at some of the object databases. There are several. I tried objectdb it supports JPA with no need of mapping which sounds like something you are looking for.

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