public class Test {
public static void main(String[] args) throws Exception {

Device device = Device.newBuilder()
.setMeterAperture(0)
.build();
// device.getMeterAlarm();

System.out.println(device.hasField(Device.getDescriptor().findFieldByNumber(Device.METER_APERTURE_FIELD_NUMBER)));
// PRINT false 
}
}

hasField can't return true;

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