How to create an object just using class name in java with spring validator?

Im making spring validation and would like to make an generic validation for three similar entities: StudentOrder, EmployeeOrder, TeacherOrder. All that have the same fields. But its a different entities. The idea is to create a one validator for three entities.

Now i have this working on only one entity EmployeeOrder:

@Service
public class EmployeeOrderValidator implements Validator {

    @Autowired
    private OrderService OrderService;

    Class <?> typeOfOrder;

    @Override
    public boolean supports(Class<?> aClass) {
        typeOfOrder=aClass;
        return aClass.isInstance(EmployeeOrder.class);
    }

 @Override
    public void validate(Object o, Errors errors) {

  EmployeeOrder tripOrder = ((EmployeeOrder) o);
//making constraints  

}

}

So i would like to have something like that for all three Entities:

@Service
    public class EmployeeOrderValidator implements Validator {
    
        @Autowired
        private OrderService OrderService;
    
        Class <?> typeOfOrder;
    
        @Override
        public boolean supports(Class<?> aClass) {
            typeOfOrder=aClass;
            return aClass.isInstance(EmployeeOrder.class);
        }
    @Override
            public void validate(Object o, Errors errors) {
        //EmployeeOrder,StudentOrder or TeacherOrder will create
    
          typeOfOrder order = ((typeOfOrder) o);
    
        //making constraints  
        
        }
    

To create an object depends on giving type of aClass will create an instance with cast of this type.