Not able to POST values from HTML to Java Class in Spring Boot

Question

I am developing an Enote app. I decided to check a few functionalities first by checking whether I can get the values from the HTML page to the Java class variable and then print them on the console. When I submit the form the values of my HTML form do not come into the Java class variable neither it print. Whereas the tutorial I am following follows the same code and can easily print the values on the console.

So in short below is my following problems:

Not able to print the values on the console when I submit the form.
Even when I am using the @Data annotation of Lombok, the object hash is getting printed on the console. That is why I have to write toString() explicitly to check the values of the object.

Below is the file structure.

[enter image description here][1]

SbtEnotesApplication.java

package com.enotes;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SbtEnotesApplication {

    public static void main(String[] args) {
        SpringApplication.run(SbtEnotesApplication.class, args);
    }

}

HomeController.java

package com.enotes.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;

import com.enotes.entity.UserDtls;

@Controller
public class HomeController {
    
    @GetMapping("/")
    public String home() {
        return "home";
    }
    
    @GetMapping("/login")
    public String login() {
        return "login";
    }
    
    @GetMapping("/signup")
    public String signup() {
        return "signup";
    }
    
    @PostMapping("/saveUser")
    public String saveUser( @ModelAttribute UserDtls user, Model m) {
        System.out.println(user);
        return "redirect:/signup";
    }
}

UserDtls.java

package com.enotes.entity;

import lombok.Data;

@Data
public class UserDtls {

    private int id;  // these variable name must be same as defined inside the HTML's tags under the name attribute. eg 
    private String name;
    private String email;
    private String password;
    private String about;

    @Override
    public String toString() {
        return "UserDtls [id=" + id + ", name=" + name + ", email=" + email + ", password=" + password + ", about="
                + about + "]";
    }

    public UserDtls() {
        
    }
}

base.html

signup.html





Insert title here


    
        
            
                
                    
                        Register Here

                        
                        

                            
                            
                        

                        

                        
                            

                                
                                    Enter Name 

                                

                                
                                    Enter Email 
                                

                                
                                    Enter Password

pom.xml



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.6.3
         
    
    com.enotes
    SBT-Enotes
    0.0.1-SNAPSHOT
    SBT-Enotes
    Enotes Spring boot Project
    
        11
    
    

  
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            org.springframework.boot
            spring-boot-starter-web
        


        
            org.springframework.boot
            spring-boot-devtools
            runtime
            true
        

        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.security
            spring-security-test
            test
          
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    
                        
                            org.projectlombok
                            lombok

Cosnsole

[enter image description here]1

festerwim_40064 · Answer

You need to use th:object and th:field to have the binding working.

Change your HTML like this:



     
       Enter Name
       

     

    ...

See Form handling with Thymeleaf for more info.