A DESCRIPTION OF THE PROBLEM :
GregorianCalendar.roll(Calendar.DAY_OF_WEEK, true) incorrectly modifies the year field when rolling from Saturday to Sunday across year boundaries, violating the documented behavior that roll() should not change larger fields.


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import java.util.Calendar;
import java.util.GregorianCalendar;

public class RollTest {
    public static void main(String args[]) {
        Calendar cal = new GregorianCalendar();
        cal.set(2020, Calendar.JANUARY, 4);
        System.out.println("Before roll: " + cal.getTime() + ", Year: " + cal.get(Calendar.YEAR));
        cal.roll(Calendar.DAY_OF_WEEK, 1);
        System.out.println("After roll: " + cal.getTime() + ", Year: " + cal.get(Calendar.YEAR));
    }
}

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