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Created attachment 93671 [details] Sample Project illustrating the issue Create two JPA entities via the NetBeans wizard, then modify one to be child class of the other. NetBeans by default generates an ID attribute for each entity. If the id attribute is not deleted from the child class, then the "Generate JSF Pages from Entity Classes" generates an invalid JSF create page for the child class, Facelets complains about a duplicate component id.
It sounds more like an enhancement since inheritance of the classes is not checked.
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