I have an object Employee which has a many-to-one mapping EmployeeType:

class Employee{
EmployeeType type;
..
..
}

If I delete an EmployeeType object from the databse and there are Employees which have this type they will all through critical errors every time I try to load an Employee Object that is that type.

So My question is if I have a bunch of employees of a certain type and someone deletes that type, How can I get all the EMployee objects to revert to a default type ???