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After add the suggested private static final long serialVersionUID = 1L, the hint is still appearing I have this hierarchy: public abstract class CustomABMController<T> implements CustomABMListener<T>, AccionListener, Component.Listener { protected final Logger LOG; private static final long serialVersionUID = 1777L; ....... } //on this class the Hint is always present public class LiquidacionChoferABMController extends CustomABMController<LiquidacionChofer> { private static final long serialVersionUID = 1L; } Product Version = NetBeans IDE 8.2 (Build 201609300101) Operating System = Windows 10 version 10.0 running on amd64 Java; VM; Vendor = 1.8.0_121 Runtime = Java HotSpot(TM) 64-Bit Server VM 25.121-b13 Reproducibility: Happens every time
Created attachment 164066 [details] IDE log