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Trying to pass Custom made objects using to th:value from View to Controller but only able to pass Java's primitive Data types through th:value. Is there any way I can send complex objects through th:value
I am new to spring and trying out some random things. It is a simple web application.
I have a form for creating a team. The form includes a text field for a team name and a bunch of checkboxes to select the team members. For each selected checkbox the corresponding member should be added into the team list.
I tried using thymeleaf's th:value attribute to pass objects from View to Controller. But I can only pass String values using th:value
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Create your Team</title>
</head>
<body>
<h1>Create your dream team</h1>
<form method="post" th:object="${team}">
<span>Name of the team</span>
<input type="text" th:field="*{name}">
<div th:each="player : ${playersList}">
<input type="checkbox" name="players" th:value="${player}" th:valueType="com.example.kkvamshee.Cricket.Player">
<span th:text="${player.name}">Player Name</span>
</div>
<button type="submit">Submit your team</button>
</form>
</body>
</html>
package com.example.kkvamshee.Cricket.web;
import com.example.kkvamshee.Cricket.Player;
import com.example.kkvamshee.Cricket.Team;
import com.example.kkvamshee.Cricket.data.JdbcPlayerRepository;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.validation.Valid;
import java.util.List;
@Slf4j
@Controller
@RequestMapping("/create-your-team")
public class CreateTeamController {
....
@GetMapping
public String showSelectTeamPage(Model model) {
List<Player> playersList = playerRepo.findAll();
model.addAttribute("playersList", playersList);
model.addAttribute("team", new Team());
return "teamCreationForm";
}
.....
}
package com.example.kkvamshee.Cricket;
import lombok.Data;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.util.List;
@Data
public class Team {
@NotNull private String name;
@Size(min = 3, max = 3, message = "You can only have 3 members on the team")
private List<Player> players;
}
Field error in object 'team' on field 'players': rejected value [Player(name=vamshee, age=20, exp=1),Player(name=messi, age=32, exp=18),Player(name=ronaldo, age=34, exp=18)]; codes [typeMismatch.team.players,typeMismatch.players,typeMismatch.java.util.List,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [team.players,players]; arguments []; default message [players]]; default message [Failed to convert property value of type 'java.lang.String[]' to required type 'java.util.List' for property 'players'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.example.kkvamshee.Cricket.Player' for property 'players[0]': no matching editors or conversion strategy found]
At the end of thid error log, there is "no matching editors or conversion strategy found".
I tried changing the th:valueType to Integer and it successfully casted corresponding text into Integer values. But i get this casting error doing the same thing with Team object or any other custom made object for instance.
595
asked Feb 16 '26 21:02
Thymeleaf can know which object you are working with especially if you have it mapped correctly and accepting it appropriately. Look at the test I did with your code.
Please watch how the action is introduced in the form.
162
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