EclipseLink can't retrieve entities inserted manually

I'm having some trouble with EclipseLink. My program has to interact with a database (representing a building). I've written a little input-testmode where I can manually insert stuff through the console开发者_如何学JAVA.

My problem: a normal getByID-operation works just fine if I try to retrieve an entity I previously inserted through EclipseLink itself (by commit()), but throws a NoResultException when trying to select a row manually inserted via SQL-script (building -> lots of rooms -> script).

This (oversemplified) works fine:

main() {
  MyRoom r = new MyRoom();
  r.setID("floor1-roomnr4");
  em.commit(r); //entity manager
  DAO.getRoomByID("floor1-roomnr4"); // works
}

and the combination of generation-script + simply getRoomByID() throws an exception.

If I try it in SQL Developer I get the result I want for the exact select statement which just threw a NoResultException. I also only get this problem in the input-mode, otherwise selecting the generated rows works also fine.

Does EclipseLink have some cache-mechanism I'm unaware of which is causing some problem?

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Are you sure EclipseLink and SQL Developer are connected to the same Database? Please verify the connection information for both. Is the generation-script committing the changes with the "commit" command?

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If EclipseLink works similarly to Hibernate then yes there is a cache. The "first level cache" guaranties that you get the exact same instance within one transaction which makes sense. If you know EclipseLink/transactions then try to evict all loaded instances or commit the transaction and then try your DAO again. This would force EclipseLink to fetch the data from the database again

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