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Example: class Utility1 { static void utility1() { } } class Utility2 extends Utility1 { static void utility2() { } } The "Utility class without constructor" hint is shown on Utility1, but not on Utility2.
Not very serious, IMO.
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