Create a User Registration Application with Spring Boot, Spring Form Validation

Objective of Example
Create Spring Boot project
Configure pom.xml
Security, MessageSource
Model, DAO
Form Bean, Validator
Controller
Thymeleaf Template
Run application

1. Objective of Example

This guide is based on:

Eclipse 3.7 (Oxygen)
Spring Boot 2.x
Spring Validation
Thymeleaf

In this post, I will show you how to create an user registration application using Spring Boot + Spring Validation + Thymeleaf. The topics mentioned in this post include:

Create a RegistrationForm on Spring.
Use Spring Validator to validate the user's information entered.
Explain the operating principle of Spring Validator.

Preview the application:

2. Create Spring Boot project

On the Eclipse, create Spring Boot project.

Enter:

Name: SbRegistrationFormValidationThymeleaf
Group: org.o7planning
Description: Spring Boot + Form Validation + Thymeleaf
Package: org.o7planning.sbformvalidation

Select technologies and libraries to use:

Security
Validation
Web
Thymeleaf

OK, Project đã được tạo ra.

SbRegistrationFormValidationThymeleafApplication.java

package org.o7planning.sbformvalidation;

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

@SpringBootApplication
public class SbRegistrationFormValidationThymeleafApplication {

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

3. Configure pom.xml

In this example, we will use the Commons Validation library to check whether the email entered by the user is correct or not. Therefore, it is necessary to declare this library in pom.xml.

** Commons Validation **

<dependencies>
    .....

        <!-- https://mvnrepository.com/artifact/commons-validator/commons-validator -->
    <dependency>
        <groupId>commons-validator</groupId>
        <artifactId>commons-validator</artifactId>
        <version>1.6</version>
    </dependency>

        .....    
</dependencies>

All contents of the pom.xml file:

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
             http://maven.apache.org/xsd/maven-4.0.0.xsd">
             
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.o7planning</groupId>
    <artifactId>SbRegistrationFormValidationThymeleaf</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SbRegistrationFormValidationThymeleaf</name>
    <description>Spring Boot + Form Validation + Thymeleaf</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/commons-validator/commons-validator -->
        <dependency>
            <groupId>commons-validator</groupId>
            <artifactId>commons-validator</artifactId>
            <version>1.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4. Security, MessageSource

In this example, we don't focus on the security of application. However, we need to go to Spring Security library to be able to encode user's password before saving it to the database. And you need to declare a Spring BEAN for encoding the password.

WebSecurityConfig.java

package org.o7planning.sbformvalidation.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

	@Bean
	public PasswordEncoder passwordEncoder() {
		BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();
		return bCryptPasswordEncoder;
	}

	// In this example we do not use Security.
	// Override this method with empty code
	// to disable the default Spring Boot security.
	@Override
	protected void configure(HttpSecurity http) throws Exception {
		// Empty code!
	}
}

In this example, we have the validation.properties file. This file contains error codes, used to notify to users when they enter incorrect information.

validation.properties

NotEmpty.appUserForm.userName=User name is required
NotEmpty.appUserForm.firstName=First Name is required
NotEmpty.appUserForm.lastName=Last name is required
NotEmpty.appUserForm.email=Email is required
NotEmpty.appUserForm.password=Password is required
NotEmpty.appUserForm.confirmPassword=Confirm Password is required
NotEmpty.appUserForm.gender=Gender is required
NotEmpty.appUserForm.countryCode=Country is required

Pattern.appUserForm.email=Invalid email
Duplicate.appUserForm.email=Email has been used by another account
Duplicate.appUserForm.userName=Username is not available
Match.appUserForm.confirmPassword=Password does not match the confirm password

You need to declare a MessageResource Spring Bean, so that the Spring automatically load the contents of the validation.properties file to memory.

WebConfiguration.java

package org.o7planning.sbformvalidation.config;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
@EnableWebMvc
public class WebConfiguration implements WebMvcConfigurer {

	@Bean
	public MessageSource messageSource() {
		ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
		// Load file: validation.properties
		messageSource.setBasename("classpath:validation");
		messageSource.setDefaultEncoding("UTF-8");
		return messageSource;
	}

}

5. Model, DAO

AppUser class represents for a record of APP_USER table. It is an user registered successfully into system.

AppUser.java

package org.o7planning.sbformvalidation.model;

public class AppUser {
    

    private Long userId;
    private String userName;
    private String firstName;
    private String lastName;
    private boolean enabled;
    private String gender;
    private String email;
    private String encrytedPassword;
    
    private String countryCode;

    public AppUser() {

    }

    public AppUser(Long userId, String userName, String firstName, String lastName, //
            boolean enabled, String gender, //
            String email,String countryCode, String encrytedPassword) {
        super();
        this.userId = userId;
        this.userName = userName;
        this.firstName = firstName;
        this.lastName = lastName;
        this.enabled = enabled;
        this.gender = gender;
        this.email = email;
        this.countryCode= countryCode;
        this.encrytedPassword = encrytedPassword;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getEncrytedPassword() {
        return encrytedPassword;
    }

    public void setEncrytedPassword(String encrytedPassword) {
        this.encrytedPassword = encrytedPassword;
    }

    public String getCountryCode() {
        return countryCode;
    }

    public void setCountryCode(String countryCode) {
        this.countryCode = countryCode;
    }

}

Country.java

package org.o7planning.sbformvalidation.model;

public class Country {

    private String countryCode;
    private String countryName;

    public Country() {

    }

    public Country(String countryCode, String countryName) {
        this.countryCode = countryCode;
        this.countryName = countryName;
    }

    public String getCountryCode() {
        return countryCode;
    }

    public void setCountryCode(String countryCode) {
        this.countryCode = countryCode;
    }

    public String getCountryName() {
        return countryName;
    }

    public void setCountryName(String countryName) {
        this.countryName = countryName;
    }
}

Gender.java

package org.o7planning.sbformvalidation.model;

public class Gender {

    public static final String MALE = "M";
    public static final String FEMALE = "F";
}

DAO (Data Access Object) classes are used to manipulate with data resources, such as query, insert, update, delete. These classes are usually annotated by @Repository for the Spring to manage them as Spring BEANs.

AppUserDAO.java

package org.o7planning.sbformvalidation.dao;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.o7planning.sbformvalidation.formbean.AppUserForm;
import org.o7planning.sbformvalidation.model.AppUser;
import org.o7planning.sbformvalidation.model.Gender;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Repository;

@Repository
public class AppUserDAO {

    // Config in WebSecurityConfig
    @Autowired
    private PasswordEncoder passwordEncoder;

    private static final Map<Long, AppUser> USERS_MAP = new HashMap<>();

    static {
        initDATA();
    }

    private static void initDATA() {
        String encrytedPassword = "";

        AppUser tom = new AppUser(1L, "tom", "Tom", "Tom", //
                true, Gender.MALE, "tom@waltdisney.com", encrytedPassword, "US");

        AppUser jerry = new AppUser(2L, "jerry", "Jerry", "Jerry", //
                true, Gender.MALE, "jerry@waltdisney.com", encrytedPassword, "US");

        USERS_MAP.put(tom.getUserId(), tom);
        USERS_MAP.put(jerry.getUserId(), jerry);
    }

    public Long getMaxUserId() {
        long max = 0;
        for (Long id : USERS_MAP.keySet()) {
            if (id > max) {
                max = id;
            }
        }
        return max;
    }

    //

    public AppUser findAppUserByUserName(String userName) {
        Collection<AppUser> appUsers = USERS_MAP.values();
        for (AppUser u : appUsers) {
            if (u.getUserName().equals(userName)) {
                return u;
            }
        }
        return null;
    }

    public AppUser findAppUserByEmail(String email) {
        Collection<AppUser> appUsers = USERS_MAP.values();
        for (AppUser u : appUsers) {
            if (u.getEmail().equals(email)) {
                return u;
            }
        }
        return null;
    }

    public List<AppUser> getAppUsers() {
        List<AppUser> list = new ArrayList<>();

        list.addAll(USERS_MAP.values());
        return list;
    }

    public AppUser createAppUser(AppUserForm form) {
        Long userId = this.getMaxUserId() + 1;
        String encrytedPassword = this.passwordEncoder.encode(form.getPassword());

        AppUser user = new AppUser(userId, form.getUserName(), //
                form.getFirstName(), form.getLastName(), false, //
                form.getGender(), form.getEmail(), form.getCountryCode(), //
                encrytedPassword);

        USERS_MAP.put(userId, user);
        return user;
    }

}

CountryDAO.java

package org.o7planning.sbformvalidation.dao;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.o7planning.sbformvalidation.model.Country;
import org.springframework.stereotype.Repository;

@Repository
public class CountryDAO {

    private static final Map<String, Country> COUNTRIES_MAP = new HashMap<>();

    static {
        initDATA();
    }

    private static void initDATA() {

        Country vn = new Country("VN", "Vietnam");
        Country en = new Country("EN", "England");
        Country fr = new Country("FR", "France");
        Country us = new Country("US", "US");
        Country ru = new Country("RU", "Russia");

        COUNTRIES_MAP.put(vn.getCountryCode(), vn);
        COUNTRIES_MAP.put(en.getCountryCode(), en);
        COUNTRIES_MAP.put(fr.getCountryCode(), fr);
        COUNTRIES_MAP.put(us.getCountryCode(), us);
        COUNTRIES_MAP.put(ru.getCountryCode(), ru);
    }

    public Country findCountryByCode(String countryCode) {
        return COUNTRIES_MAP.get(countryCode);
    }

    public List<Country> getCountries() {
        List<Country> list = new ArrayList<>();
        list.addAll(COUNTRIES_MAP.values());
        return list;
    }

}

6. Form Bean, Validator

AppUserForm class represents for the data to be entered in a registration form by users.

AppUserForm.java

package org.o7planning.sbformvalidation.formbean;

public class AppUserForm {

    private Long userId;
    private String userName;
    private String firstName;
    private String lastName;
    private boolean enabled;
    private String gender;
    private String email;
    private String password;
    private String confirmPassword;
    private String countryCode;

    public AppUserForm() {

    }

    public AppUserForm(Long userId, String userName, //
            String firstName, String lastName, boolean enabled, //
            String gender, String email, String countryCode, //
            String password, String confirmPassword) {
        this.userId = userId;
        this.userName = userName;
        this.firstName = firstName;
        this.lastName = lastName;
        this.enabled = enabled;
        this.gender = gender;
        this.email = email;
        this.countryCode = countryCode;
        this.password = password;
        this.confirmPassword = confirmPassword;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getCountryCode() {
        return countryCode;
    }

    public void setCountryCode(String countryCode) {
        this.countryCode = countryCode;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getConfirmPassword() {
        return confirmPassword;
    }

    public void setConfirmPassword(String confirmPassword) {
        this.confirmPassword = confirmPassword;
    }
}

AppUserValidator class is used to validate the information entered in the form by users. Thus, the AppUserValidator will validate the values of fields of the AppUserForm object.

AppUserValidator.java

package org.o7planning.sbformvalidation.validator;

import org.apache.commons.validator.routines.EmailValidator;
import org.o7planning.sbformvalidation.dao.AppUserDAO;
import org.o7planning.sbformvalidation.formbean.AppUserForm;
import org.o7planning.sbformvalidation.model.AppUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

@Component
public class AppUserValidator implements Validator {

	// common-validator library.
	private EmailValidator emailValidator = EmailValidator.getInstance();

	@Autowired
	private AppUserDAO appUserDAO;

	// The classes are supported by this validator.
	@Override
	public boolean supports(Class<?> clazz) {
		return clazz == AppUserForm.class;
	}

	@Override
	public void validate(Object target, Errors errors) {
		AppUserForm appUserForm = (AppUserForm) target;

		// Check the fields of AppUserForm.
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "userName", "NotEmpty.appUserForm.userName");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "firstName", "NotEmpty.appUserForm.firstName");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "lastName", "NotEmpty.appUserForm.lastName");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email", "NotEmpty.appUserForm.email");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "NotEmpty.appUserForm.password");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "confirmPassword", "NotEmpty.appUserForm.confirmPassword");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "gender", "NotEmpty.appUserForm.gender");
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "countryCode", "NotEmpty.appUserForm.countryCode");

		if (!this.emailValidator.isValid(appUserForm.getEmail())) {
			// Invalid email.
			errors.rejectValue("email", "Pattern.appUserForm.email");
		} else if (appUserForm.getUserId() == null) {
			AppUser dbUser = appUserDAO.findAppUserByEmail(appUserForm.getEmail());
			if (dbUser != null) {
				// Email has been used by another account.
				errors.rejectValue("email", "Duplicate.appUserForm.email");
			}
		}

		if (!errors.hasFieldErrors("userName")) {
			AppUser dbUser = appUserDAO.findAppUserByUserName(appUserForm.getUserName());
			if (dbUser != null) {
				// Username is not available.
				errors.rejectValue("userName", "Duplicate.appUserForm.userName");
			}
		}

		if (!errors.hasErrors()) {
			if (!appUserForm.getConfirmPassword().equals(appUserForm.getPassword())) {
				errors.rejectValue("confirmPassword", "Match.appUserForm.confirmPassword");
			}
		}
	}

}

7. Controller

MainController.java

package org.o7planning.sbformvalidation.controller;

import java.util.List;

import org.o7planning.sbformvalidation.dao.AppUserDAO;
import org.o7planning.sbformvalidation.dao.CountryDAO;
import org.o7planning.sbformvalidation.formbean.AppUserForm;
import org.o7planning.sbformvalidation.model.AppUser;
import org.o7planning.sbformvalidation.model.Country;
import org.o7planning.sbformvalidation.validator.AppUserValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
// import org.springframework.transaction.annotation.Transactional;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

@Controller
public class MainController {

   @Autowired
   private AppUserDAO appUserDAO;

   @Autowired
   private CountryDAO countryDAO;

   @Autowired
   private AppUserValidator appUserValidator;

   // Set a form validator
   @InitBinder
   protected void initBinder(WebDataBinder dataBinder) {
      // Form target
      Object target = dataBinder.getTarget();
      if (target == null) {
         return;
      }
      System.out.println("Target=" + target);

      if (target.getClass() == AppUserForm.class) {
         dataBinder.setValidator(appUserValidator);
      }
      // ...
   }

   @RequestMapping("/")
   public String viewHome(Model model) {

      return "welcomePage";
   }

   @RequestMapping("/members")
   public String viewMembers(Model model) {

      List<AppUser> list = appUserDAO.getAppUsers();

      model.addAttribute("members", list);

      return "membersPage";
   }

   @RequestMapping("/registerSuccessful")
   public String viewRegisterSuccessful(Model model) {

      return "registerSuccessfulPage";
   }

   // Show Register page.
   @RequestMapping(value = "/register", method = RequestMethod.GET)
   public String viewRegister(Model model) {

      AppUserForm form = new AppUserForm();
      List<Country> countries = countryDAO.getCountries();

      model.addAttribute("appUserForm", form);
      model.addAttribute("countries", countries);

      return "registerPage";
   }

   // This method is called to save the registration information.
   // @Validated: To ensure that this Form
   // has been Validated before this method is invoked.
   @RequestMapping(value = "/register", method = RequestMethod.POST)
   public String saveRegister(Model model, //
         @ModelAttribute("appUserForm") @Validated AppUserForm appUserForm, //
         BindingResult result, //
         final RedirectAttributes redirectAttributes) {

      // Validate result
      if (result.hasErrors()) {
         List<Country> countries = countryDAO.getCountries();
         model.addAttribute("countries", countries);
         return "registerPage";
      }
      AppUser newUser= null;
      try {
         newUser = appUserDAO.createAppUser(appUserForm);
      }
      // Other error!!
      catch (Exception e) {
         List<Country> countries = countryDAO.getCountries();
         model.addAttribute("countries", countries);
         model.addAttribute("errorMessage", "Error: " + e.getMessage());
         return "registerPage";
      }

      redirectAttributes.addFlashAttribute("flashUser", newUser);
      
      return "redirect:/registerSuccessful";
   }

}

8. Thymeleaf Template

_menu.html

<div xmlns:th="http://www.thymeleaf.org"
     style="border: 1px solid #ccc;padding:5px;margin-bottom:20px;">

  <a th:href="@{/}">Home</a>

     | &nbsp;

   <a th:href="@{/members}">Members</a>

     | &nbsp;

   <a th:href="@{/register}">Register</a>
  

</div>

membersPage.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <title th:utext="${title}"></title>
   </head>
   
   <style>
      table th, table td {
         padding: 5px;
      }
      .message {
         color: blue;
      }
   </style>
   
   <body>
   
      <!-- Include _menu.html -->
      <th:block th:include="/_menu"></th:block>  
      
      <h2>Members</h2>
      
   
      
      <table border="1">
            <tr>
               <th>User Name</th>
               <th>First Name</th>
               <th>Last Name</th>
               <th>Email</th>
               <th>Gender</th>
            </tr>
            <tr th:each ="member : ${members}">
               <td th:utext="${member.userName}">...</td>
               <td th:utext="${member.firstName}">...</td>
               <td th:utext="${member.lastName}">...</td>
               <td th:utext="${member.email}">...</td>
               <td th:utext="${member.gender}">...</td>
            </tr>
      </table>
      
   </body>
</html>

registerPage.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <title th:utext="${title}"></title>
      <style>
         th, td {
         padding: 5px;
         }
         td span  {
         font-size:90%;
         font-style: italic;
         color: red;
         }
         .error {
         color: red;
         font-style: italic;
         }
      </style>
   </head>
   <body>
      <!-- Include _menu.html -->
      <th:block th:include="/_menu"></th:block>
      
      <h2>Register</h2>
      
      <div th:if="${errorMessage != null}"
           th:utext="${errorMessage}" class="error">...</div>
      
      <form th:action="@{/register}" th:object="${appUserForm}" method="POST">
         <table>
            <tr>
               <td>User Name</td>
               <td><input type="text" th:field="*{userName}" /></td>
               <td>
                  <span th:if="${#fields.hasErrors('userName')}" th:errors="*{userName}">..</span>
               </td>
            </tr>
            <tr>
               <td>Password</td>
               <td><input type="password" th:field="*{password}" /> </td>
               <td>
                  <span th:if="${#fields.hasErrors('password')}" th:errors="*{password}">..</span>
               </td>
            </tr>
            <tr>
               <td>Confirm</td>
               <td><input type="password" th:field="*{confirmPassword}" /> </td>
               <td>
                  <span th:if="${#fields.hasErrors('confirmPassword')}" th:errors="*{confirmPassword}">..</span>
               </td>
            </tr>
            <tr>
               <td>Email</td>
               <td><input type="text" th:field="*{email}" /> </td>
               <td>
                  <span th:if="${#fields.hasErrors('email')}" th:errors="*{email}">..</span>
               </td>
            </tr>
            <tr>
               <td>First Name</td>
               <td><input type="text" th:field="*{firstName}" /> </td>
               <td>
                  <span th:if="${#fields.hasErrors('firstName')}" th:errors="*{firstName}">..</span>
               </td>
            </tr>
            <tr>
               <td>Last Name</td>
               <td><input type="text" th:field="*{lastName}" /> </td>
               <td>
                  <span th:if="${#fields.hasErrors('lastName')}" th:errors="*{lastName}">..</span>
               </td>
            </tr>
            <tr>
               <td>Gender</td>
               <td>
                  <select th:field="*{gender}">
                     <option value=""> -- </option>
                     <option value="M">Male</option>
                     <option value="F">Female</option>
                  </select>
               </td>
               <td>
                  <span th:if="${#fields.hasErrors('gender')}" th:errors="*{gender}">..</span>
               </td>
            </tr>
            <tr>
               <td>Country</td>
               <td>
                  <select th:field="*{countryCode}">
                     <option value=""> -- </option>
                     <option th:each="country : ${countries}"
                        th:value="${country.countryCode}"
                        th:utext="${country.countryName}"/>
                  </select>
               <td><span th:if="${#fields.hasErrors('countryCode')}" th:errors="*{countryCode}">..</span></td>
            </tr>
            <tr>
               <td>&nbsp;</td>
               <td>
                  <input type="submit" value="Submit" />
                  <a th:href="@{/}">Cancel</a>
               </td>
               <td>&nbsp;</td>
            </tr>
         </table>
      </form>
      
   </body>
</html>

registerSuccessfulPage.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <title>Successfully registered</title>
      <style>
        span {color: blue;}
      </style>
   </head>
   
   <body>
   
      <!-- Include _menu.html -->
      <th:block th:include="/_menu"></th:block>  
      
      <h2>You have successfully registered!</h2>
      
      <div th:if="${flashUser != null}">
         <ul>
            <li>User Name: <span th:utext="${flashUser.userName}">..</span></li>
            <li>Email: <span th:utext="${flashUser.email}">..</span></li>
         </ul>
      </div>
     
      
   </body>
</html>

welcomePage.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <title th:utext="${title}"></title>
   </head>
   
   <body>
   
      <!-- Include _menu.html -->
      <th:block th:include="/_menu"></th:block>  
      
      <h2>Home Page!</h2>
      
   </body>
</html>