Field value in a Class does not get updated with Spring Boot MVC Controller - spring

Question

I have a Parcel Entity, and I am populating the fields through #PostMapping. The value Volume should be gotten from a method taking in values from the agruments in the constructor.
Controller Class:
#Controller
public class Controller {
#Value("#{${listOfBases}}")
private List<String> listOfBases;
#Value("#{${listOfDestinations}}")
private List<String> listOfDestinations;
#Autowired
ParcelRepository parcelRepository;
#GetMapping("/register_parcel")
public String showParcelRegistrationForm(Model model) {
Parcel parcel = new Parcel();
model.addAttribute("parcel", parcel);
model.addAttribute("listOfBases", listOfBases);
model.addAttribute("listOfDestinations", listOfDestinations);
return "parcel/register_form_parcel";
}
#PostMapping("register_parcel")
public String registerParcel(#ModelAttribute("parcel") Parcel parcel) {
System.out.println(parcel);
parcelRepository.save(parcel);
return "user/user_registration_success_form";
}
}
Parcel Class:
#Entity
public class Parcel {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
int id;
String length;
String width;
String height;
String weight;
String base;
String destination;
String creationDate;
String volume;
No args constructor:
public Parcel() {
creationDate = getCreationDateAndTime();
}
public Parcel(int id, String length, String width, String height, String weight, String base, String destination) {
this.id = id;
this.length = length;
this.width = width;
this.height = height;
this.weight = weight;
this.base = base;
this.destination = destination;
creationDate = getCreationDateAndTime();
volume = String.valueOf(calculateVolume(width, height, length));
}
Getters and Setters:
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLength() {
return length;
}
public void setLength(String length) {
this.length = length;
}
public String getWidth() {
return width;
}
public void setWidth(String width) {
this.width = width;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public String getWeight() {
return weight;
}
public void setWeight(String weight) {
this.weight = weight;
}
public String getBase() {
return base;
}
public void setBase(String base) {
this.base = base;
}
public String getDestination() {
return destination;
}
public void setDestination(String destination) {
this.destination = destination;
}
public String getCreationDate() {
return creationDate;
}
public void setCreationDate(String creationDate) {
this.creationDate = creationDate;
}
public String getVolume() {
return volume;
}
public void setVolume(String volume) {
this.volume = volume;
}
private String getCreationDateAndTime() {
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime now = LocalDateTime.now();
return dtf.format(now);
}
CalculateVolume method that is the root of the problem:
private int calculateVolume(String width, String height, String length) {
int w = Integer.parseInt(width);
int h = Integer.parseInt(height);
int l = Integer.parseInt(length);
return w * h * l;
}
But the value volume is null in my database. Even System.out.println(); in calculateVolume does not print anything on the console, but when I run create an instance in main, all runs fine and dandy.
Any ideas on how I should proceed, or is my question too vague?
Thank you
#Override
public String toString() {
return "Parcel{" +
"id=" + id +
", length='" + length + '\'' +
", width='" + width + '\'' +
", height='" + height + '\'' +
", weight='" + weight + '\'' +
", base='" + base + '\'' +
", destination='" + destination + '\'' +
", creationDate='" + creationDate + '\'' +
", volume='" + volume + '\'' +
'}';
}
}

Answer 1

Change Post method in your controller
from
public String registerParcel(#ModelAttribute("parcel") Parcel parcel)
to
public String registerParcel(#RequestBody Parcel parcel)