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I've been having some problems with a faulty database schema (i.e. a table got the same name in the Entity classes since one table used camel case and the other used an underscore) The generator apparently failed that moment and generated only half the complete classes and the other half were just empty (except for the class name and curly braces. There was, however, no feedback of the failure and the wizard appeared to have completed without problems. This made it hard to debug the problem. It would be good that if the generator has problems, it reports them and the reason of these problems.
unfortunately current jpa support do not recignize/work properly with case sensitive db/db settings. there are few issues related already.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss