Question

How can you get the data type of a variable argument in Java if the varg is set to null? I use the getClass to retrieve the type. Is there any other way?

public void method(String name, Object ... vargs)
{
    for(Object arg : vargs)
    {
        mapType.put(arg.getClass());
        mapVal.put(arg);
    }
}

The only thing i could think of is using annotation from the calling function. Is there any other way?

Answer 1

We have stacked with the same problem to load data from DB and cast as expected.
Unfortunately null has no type. Instead we have used generic wrapper, that always was non-null, but could contain the null value. In this case type info is available over wrapper’s field.