How to use input radio button with thymeleaf and Spring MVC - spring-mvc

Question

I would like to get a destination address from a input radio button list. The DestinationAddress class is the following:
public class DestinationAddress {
private Integer destinationAddressId;
private String name;
private Location location;
private User owner;
public DestinationAddress(String name, Location location, User owner) {
this.name = name;
this.location = location;
this.owner = owner;
}
public DestinationAddress() {
}
// getter and setter
}
The controller who handles the get and post is the following:
#PreAuthorize("hasRole('USER')")
#GetMapping(value = "/select-address")
public String selectAddress(Principal principal, Model model) {
List<DestinationAddress> addresses = destinationAddressService.getAllByUsername(principal.getName());
model.addAttribute("destinationAddresses", addresses);
model.addAttribute("destinationAddress", new DestinationAddress());
return "purchase/select-address";
}
#PreAuthorize("hasRole('USER')")
#PostMapping(value = "/select-address")
public String selectAddress(#ModelAttribute DestinationAddress destinationAddress, Principal principal) {
Purchase purchase = purchaseService.addPurchase(principal.getName(), destinationAddress);
return "redirect:/purchases/pay/" + purchase.getPurchaseId();
}
And the html page is the following:
<form th:object="${destinationAddress}" method="post">
<fieldset>
<legend>Your addresses</legend>
<ul>
<li th:each="destinationAddress : ${destinationAddresses}">
<input type="radio" th:field="*{destinationAddressId}" th:value="${destinationAddress.destinationAddressId}" />
<label th:for="${#ids.prev('destinationAddress.destinationAddressId')}" th:text="${destinationAddress}"></label>
</li>
</ul>
</fieldset>
<p><input type="submit" value="Submit" /> <input type="reset" value="Reset" /></p>
</form>
The error message is the following:
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'destinationAddressId' available as request attribute
I don't know what's the problem here. I don't know which type will the form return to the controller. So I don't know which variable pass to the model and which one to get from the post controller method. Integer or DestinationAddress? I cannot find anything googling it, just small pieces of code without any explanations. Any suggestions?

Answer 1

I found a solution to my problem. I changed the html page, now it looks like this:
<form th:object="${address}" method="post">
<fieldset>
<legend>Your addresses</legend>
<ul>
<li th:each="destinationAddress : ${destinationAddresses}">
<input type="radio" th:field="${address.destinationAddressId}" th:value="${destinationAddress.destinationAddressId}" />
<label th:for="${destinationAddress.destinationAddressId}" th:text="${destinationAddress}"></label>
</li>
</ul>
</fieldset>
<p><input type="submit" value="Submit" /> <input type="reset" value="Reset" /></p>
</form>
I changed the name of the object inside the model because it was the same as the name of the temp destinationAddress of the loop. I also replaced '{#ids.prev(' because it was giving me an error:
Cannot obtain previous ID count for ID ...
Now it works fine.