Question

This method does the following : it gets the int startAge from the Database. This parameter has a set default of 0 and is not nullable. Then it checks if it´s bigger than zero, in which case it adds it to dob and returns it.

Pretty simple, actually, but i keep getting a NullPointerException on the marked line, although the Database makes sure the variable CANNOT be null and the parameter groupFrom in the entity class is also set to nullable=false.

Any hints ?

public static DateMidnight getRealStartDate(DateMidnight startDate, DateMidnight dob, Groups group){
    DateMidnight realStart = null;
    int startAge = group.getGroupFrom(); //nullPointerException
    if (startAge > 0) {
        realStart = dob.plusMonths(startAge);
    } else {
        realStart = startDate;
    }   
    return realStart;
}

Answer 1

If you get a NullPointerException at that line it means that the variable group is null.