Question

my problem is with RegularTimePeriod…
i have the date in the datebase saved as Date type
i’m trying to retrieve them and process them through RegularTimePeriod but it keeps giving me null…
the code is

    RegularTimePeriod t = new Day();
    t = t.createInstance(Date.class, resultado.getData(), TimeZone.getDefault());

but i’m always getting it as empty value when i debug it, can anyone tell me a way to get it work please.

Answer 1

Take a look at the source code of this function

public static RegularTimePeriod createInstance(Class c, 
                        Date millisecond, TimeZone zone) {
    RegularTimePeriod result = null;
    try {
        Constructor constructor = c.getDeclaredConstructor(
                    new Class[] { Date.class, TimeZone.class });
        result = (RegularTimePeriod) constructor.newInstance(
                    new Object[] { millisecond, zone });
    } catch (Exception e) {
        // do nothing, so null is returned
    }
    return result;
}

it expects subclass of RegularTimePeriod, but you use it with Date which is not what required.

I assume you should do something like

t = t.createInstance(Day.class, resultado.getData(), TimeZone.getDefault());