Order DTO that will be built with SPEL

OrderDTO.java

@Component
public class MapperUtility {

    public OrderDTO buildOrderDTO(Long orderNumber, Double totalAmount) {
        OrderDTO order = new OrderDTO();
        order.setOrderNumber(orderNumber);
        order.setTotalAmount("$" + totalAmount);
        return order;
    }
}

public class OrderDTO {
    private Long orderNumber;
    private String totalAmount;

    // Getters and Setter
}