Inside the If statement there a RETURN FALSE, which just should be RETURN, the IDE doesn't detect the "bad return" until it is compiled.
There is no RED error highlighted in that row neither adobe or below.


abm.getBtnAceptar().addActionListener(evt -> {
            if (JOptionPane.YES_OPTION
                    != JOptionPane.showConfirmDialog(abm, "Confirmar acreditación: $" + panelABM.getTxtTotal().getText() + " a " + delegacion.getNombre(),
                            "Acreditar Dinero", JOptionPane.YES_NO_OPTION)) {
                return false;
            }
 ..........
 ..........
});

Compiling error:  error: incompatible types: bad return type in lambda expression
                return false;
    unexpected return value


Product Version = NetBeans IDE 8.2 (Build 201609300101)
Operating System = Windows 10 version 10.0 running on amd64
Java; VM; Vendor = 1.8.0_112
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.112-b15

Reproducibility: Happens every time