Spring Boot 3 + Spring Security 6 + Thymeleaf - Registration and Login Example

In this section we will learn how to create user registration and login using Spring boot 3, Spring security 6, Thymeleaf, JPA, and PostgreSQL. The GitHub repository link is provided at the end of this tutorial. You can download the source code.


What’s New in Spring Security 6?

  • WebSecurityConfigurerAdapter Removed: The WebSecurityConfigurerAdapter class was deprecated and then removed in Spring Security 6. Instead, you should now take a more component-based approach and create a bean of type SecurityFilterChain. Here's an example:
@Configuration
@EnableWebSecurity
public class SecurityConfiguration {

   @Bean
   public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
      http
              .authorizeHttpRequests((requests) -> requests
                      .requestMatchers("/registration**").permitAll()
                      .anyRequest().authenticated()
              )
              .formLogin((form) -> form
                      .loginPage("/login")
                      .permitAll()
              )
              .logout((logout) -> logout
                      .logoutUrl("/logout")
                      .logoutSuccessUrl("/")
                      .invalidateHttpSession(true));

      return http.build();
   }
}


  • Method authorizeRequests() has been deprecated and shouldn’t be used anymore: The authorizeRequests() method of the WebSecurityConfigurerAdapter class has been deprecated and shouldn’t be used anymore. This method was previously used to configure the authorization rules for securing web applications. Instead, you should use the HttpSecurity class and its authorizeHttpRequests() method instead. Here's an example:
   @Bean
   public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
      http
              .authorizeHttpRequests((requests) -> requests
                      .requestMatchers("/registration**").permitAll()
                      .anyRequest().authenticated()
              )
              .formLogin((form) -> form
                      .loginPage("/login")
                      .permitAll()
              )
              .logout((logout) -> logout
                      .logoutUrl("/logout")
                      .logoutSuccessUrl("/")
                      .invalidateHttpSession(true));

      return http.build();
   }
}


  • Requestmatchers Replacing Antmatcher, Mvcmatcher, and Regexmatcher:In Spring Security 6.0, antMatchers() as well as other configuration methods for securing requests (namely mvcMatchers() and regexMatchers()) have been removed from the API. An overloaded method requestMatchers() was introduced as a uniform mean for securing requests. The requestMatchers() facilitate all the ways of restricting requests that were supported by the removed methods. Here's an example that permits access to the /registration endpoint without authentication.
   @Bean
   public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
      http
              .authorizeHttpRequests((requests) -> requests
                      .requestMatchers("/registration").permitAll()
                      .anyRequest().authenticated()
              )
              .formLogin((form) -> form
                      .loginPage("/login")
                      .permitAll()
              )
              .logout((logout) -> logout
                      .logoutUrl("/logout")
                      .logoutSuccessUrl("/")
                      .invalidateHttpSession(true));

      return http.build();
   }
}


  • Regarding deprecated annotation @EnableGlobalMethodSecurity it was replaced with @EnableMethodSecurity: Note that you can avoid using prePostEnabled = true, because by default is true.
boolean prePostEnabled() default true;
boolean jsr250Enabled() default false;
boolean proxyTargetClass() default false;

Technologies and Tools Used:

  • Java 17 or Later
  • Spring Boot 3+
  • Spring Framework 6+
  • Spring Security 6.1.4
  • Hibernate 6+
  • JPA
  • Maven
  • Thymeleaf
  • PostgreSQL 

User Interface

User Login


User Registration


Login Successful

Project Structure:


Maven Dependencies - pom.xml file

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.1.4</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>registration-login-spring-boot-security6-thymeleaf</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>registration-login-spring-boot-security6-thymeleaf</name>
   <description>Demo project for Spring Boot + Spring Security 6 + Thymeleaf</description>
   <properties>
      <java.version>17</java.version>
   </properties>
   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
      <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-web</artifactId>
      </dependency>
      <dependency>
         <groupId>org.thymeleaf.extras</groupId>
         <artifactId>thymeleaf-extras-springsecurity6</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <scope>runtime</scope>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>org.postgresql</groupId>
         <artifactId>postgresql</artifactId>
         <scope>runtime</scope>
      </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>

Configure PostgreSQL Database
Let’s configure Spring Boot to use PostgreSQL as our data source. We are simply adding PostgreSQL database URL, username, and password in the src/main/resources/application.yaml file -
spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/mydb
    username: postgres
    password: root
  jpa:
    hibernate:
      ddl-auto: update # Hibernate ddl auto (create, create-drop, validate, update),production set to none or comment it
    show-sql: true
    database-platform: org.hibernate.dialect.PostgreSQLDialect
    open-in-view: false
    generate-ddl: true

Create JPA Entity - User.java
package com.knf.dev.demo.entity;

import jakarta.persistence.*;
import java.util.Collection;

@Entity
@Table(name = "my_user", uniqueConstraints =
       @UniqueConstraint(columnNames = "email"))
public class User {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;

   @Column(name = "first_name")
   private String firstName;

   @Column(name = "last_name")
   private String lastName;

   private String email;

   private String password;

   @ManyToMany(fetch = FetchType.EAGER, 
                   cascade = CascadeType.ALL)
   @JoinTable(name = "users_roles", 
       joinColumns = @JoinColumn(name = "user_id", 
         referencedColumnName = "id"), 
           inverseJoinColumns = @JoinColumn
              (name = "role_id", 
                 referencedColumnName = "id"))
   private Collection<Role> roles;

   public User() {

   }

   public User(String firstName, String lastName, 
         String email, String password, 
                   Collection<Role> roles) {
      
      this.firstName = firstName;
      this.lastName = lastName;
      this.email = email;
      this.password = password;
      this.roles = roles;
   }

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   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 String getEmail() {
      return email;
   }

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

   public String getPassword() {
      return password;
   }

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

   public Collection<Role> getRoles() {
      return roles;
   }

   public void setRoles(Collection<Role> roles) {
      this.roles = roles;
   }
}
The @Entity annotation specifies that the class is an entity and is mapped to a database table. The @Table annotation specifies the name of the database table to be used for mapping. The @Id annotation specifies the primary key of an entity and the @GeneratedValue provides for the specification of generation strategies for the values of primary keys. The @Column annotation is used to specify the mapped column for a persistent property or field. If no Column annotation is specified, the default value will be applied. We use @ManyToMany annotation to create a many-to-many relationship between two entities.

Create JPA Entity - Role.java
package com.knf.dev.demo.entity;

import jakarta.persistence.*;

@Entity
@Table(name = "role")
public class Role {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;
   private String name;

   public Role() {

   }

   public Role(String name) {
      super();
      this.name = name;
   }

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }
}
The @Entity annotation specifies that the class is an entity and is mapped to a database table. The @Table annotation specifies the name of the database table to be used for mapping. The @Id annotation specifies the primary key of an entity and the @GeneratedValue provides for the specification of generation strategies for the values of primary keys.

Create User Repository
package com.knf.dev.demo.repository;

import com.knf.dev.demo.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {
   
   User findByEmail(String email);
}
JpaRepository is a JPA-specific extension of Repository. It contains an API for basic CRUD operations and also API for pagination and sorting.

Create User Service
package com.knf.dev.demo.service;

import com.knf.dev.demo.dto.UserRegistrationDto;
import com.knf.dev.demo.entity.User;
import org.springframework.security.core.userdetails.UserDetailsService;

import java.util.List;

public interface UserService extends UserDetailsService {
   
   User save(UserRegistrationDto registrationDto);
   List<User> getAll();
}
The UserDetailsService interface is used to retrieve user-related data. It has one method named loadUserByUsername().

Create User Service Implementation
package com.knf.dev.demo.service.impl;


import com.knf.dev.demo.dto.UserRegistrationDto;
import com.knf.dev.demo.entity.Role;
import com.knf.dev.demo.entity.User;
import com.knf.dev.demo.repository.UserRepository;
import com.knf.dev.demo.service.UserService;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class UserServiceImpl implements UserService {

   private UserRepository userRepository;
   private BCryptPasswordEncoder passwordEncoder;

   public UserServiceImpl(UserRepository userRepository, BCryptPasswordEncoder passwordEncoder) {
      super();
      this.userRepository = userRepository;
      this.passwordEncoder = passwordEncoder;
   }

   @Override
   public User save(UserRegistrationDto registrationDto) {
      
      var user = new User(registrationDto.getFirstName(),
                 registrationDto.getLastName(), 
                  registrationDto.getEmail(),
                   passwordEncoder.encode(registrationDto
                          .getPassword()), 
                   Arrays.asList(new Role("ROLE_ADMIN")));

      return userRepository.save(user);
   }

   @Override
   public UserDetails loadUserByUsername(String username)
         throws UsernameNotFoundException {

      var user = userRepository.findByEmail(username);
      if (user == null) {
         throw new UsernameNotFoundException
               ("Invalid username or password.");
      }
      return new org.springframework.security
            .core.userdetails.User(user.getFirstName(),
               user.getPassword(),
           mapRolesToAuthorities(user.getRoles()));
   }

   private Collection<? extends GrantedAuthority>
          mapRolesToAuthorities(Collection<Role> roles) {
      
      return roles.stream()
            .map(role -> new SimpleGrantedAuthority
                  (role.getName()))
            .collect(Collectors.toList());
   }

   @Override
   public List<User> getAll() {
      
      return userRepository.findAll();
   }
}

Create User Registration DTO
package com.knf.dev.demo.dto;

public class UserRegistrationDto {

   private String firstName;
   private String lastName;
   private String email;
   private String password;

   public UserRegistrationDto() {

   }

   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 String getEmail() {
      return email;
   }

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

   public String getPassword() {
      return password;
   }

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

Create Security Configuration
package com.knf.dev.demo.config;

import com.knf.dev.demo.service.UserService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
@EnableWebSecurity
public class SecurityConfiguration {

   @Bean
   public BCryptPasswordEncoder passwordEncoder() {

      return new BCryptPasswordEncoder();
   }

   @Bean
   public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
      http
              .authorizeHttpRequests((requests) -> requests
                      .requestMatchers("/registration").permitAll()
                      .anyRequest().authenticated()
              )
              .formLogin((form) -> form
                      .loginPage("/login")
                      .permitAll()
              )
              .logout((logout) -> logout
                      .logoutUrl("/logout")
                      .logoutSuccessUrl("/")
                      .invalidateHttpSession(true));

      return http.build();
   }
}

Create Home Controller
package com.knf.dev.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class HomeController {

   @GetMapping("/login")
   public String login() {
      return "login";
   }

   @GetMapping("/")
   public String home() {
      return "index";
   }
}

Create Registration Controller
package com.knf.dev.demo.controller;

import com.knf.dev.demo.dto.UserRegistrationDto;
import com.knf.dev.demo.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/registration")
public class RegistrationController {

   private UserService userService;

   public RegistrationController(UserService userService) {
      super();
      this.userService = userService;
   }

   @ModelAttribute("user")
   public UserRegistrationDto userRegistrationDto() {
      return new UserRegistrationDto();
   }

   @GetMapping
   public String showRegistrationForm() {
      return "registration";
   }

   @PostMapping
   public String registerUserAccount(@ModelAttribute("user") 
                  UserRegistrationDto registrationDto) {

      try {
         userService.save(registrationDto);
      }catch(Exception e)
      {
         System.out.println(e);
         return "redirect:/registration?email_invalid";
      }
      return "redirect:/registration?success";
   }
}

Spring Boot Main Driver
package com.knf.dev.demo;

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

@SpringBootApplication
public class Application {

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

}

View Layer
index.html
<!DOCTYPE html>
<html>
<head>
    <meta charset="ISO-8859-1">
    <title>Spring Security 6 + Thymeleaf Demo</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>

<body>
<!-- create navigation bar ( header) -->
<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed"
                    data-toggle="collapse" data-target="#navbar"
                    aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span> <span class="icon-bar">
                    </span>
            </button>
            <a class="navbar-brand">
                Registration and Login with Spring Boot 3 + Spring Security 6 + Thymeleaf</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="nav navbar-nav navbar-right">
                <li sec:authorize="isAuthenticated()">
                    <a href="javascript: document.logoutForm.submit()" class="dropdown-toggle">Sign out</a>
                    <form name="logoutForm" th:action="@{/logout}" method="post" th:hidden="true">
                        <input hidden type="submit" value="Sign Out" />
                    </form>
                </li>
            </ul>
        </div>
    </div>
</nav>

<br><br><br><br>
<div class="container">
    <div class="alert alert-success">
        Hello <strong><span sec:authentication="principal.username"></span></strong>
        Login Successful.
    </div>
</div>
<input type="hidden" th:name="${_csrf.parameterName}"
       th:value="${_csrf.token}" />
</body>
</html>

login.html
<!DOCTYPE html>
<html>
<head>
    <meta charset="ISO-8859-1">
    <title>Spring Security 6 + Thymeleaf Demo</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>

<body>
<!-- create navigation bar ( header) -->
<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed"
                    data-toggle="collapse" data-target="#navbar"
                    aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span> <span
                    class="icon-bar"></span> <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand">
                Registration and Login with Spring Boot 3 + Spring Security 6 + Thymeleaf</a>
        </div>
    </div>
</nav>

<br><br><br><br><br><br><br>
<div class="container">
    <div class="row">
        <div class="col-md-6 col-md-offset-3">

            <h1>User Login Page</h1>
            <form th:action="@{/login}" method="post">

                <!-- error message -->
                <div th:if="${param.error}">
                    <div class="alert alert-danger">Invalid username or
                        password.</div>
                </div>

                <!-- logout message -->
                <div th:if="${param.logout}">
                    <div class="alert alert-info">
                        You have been logged out.</div>
                </div>

                <div class="form-group">
                    <label for="username"> Email </label> :
                    <input type="text" class="form-control" id="username"
                           name="username" placeholder="Enter Email ID"
                           autofocus="autofocus">
                </div>

                <div class="form-group">
                    <label for="password">Password</label>:
                    <input type="password" id="password" name="password"
                           class="form-control" placeholder="Enter Password" />
                </div>

                <div class="form-group">
                    <div class="row">
                        <div class="col-sm-6 col-sm-offset-3">
                            <input type="submit" name="login-submit"
                                   id="login-submit"
                                   class="form-control btn btn-primary"
                                   value="Log In" />
                        </div>
                    </div>
                </div>
            </form>
            <div class="form-group">
                    <span>New user? <a href="/" th:href="@{/registration}">
                Register
                  here</a></span>
            </div>
        </div>
    </div>
</div>
</body>
</html>

registration.html
<!DOCTYPE html>
<html>
<head>
    <meta charset="ISO-8859-1">
    <title>Spring Security 6 + Thymeleaf Demo</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>

<body>
<!-- create navigation bar ( header) -->
<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed"
                    data-toggle="collapse" data-target="#navbar"
                    aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span> <span
                    class="icon-bar"></span> <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand">
                Registration and Login with Spring Boot 3 + Spring Security 6 + Thymeleaf</a>
        </div>
    </div>
</nav>

<br><br><br><br><br><br><br>
<!-- Create HTML registration form -->
<div class="container">
    <div class="row">
        <div class="col-md-6 col-md-offset-3">

            <!-- success message -->
            <div th:if="${param.success}">
                <div class="alert alert-info">You've successfully registered
                    to our awesome app!</div>
            </div>

            <div th:if="${param.email_invalid}">
                <div class="alert alert-danger">
                    Email is Already Registered!</div>
            </div>

            <h1>Registration</h1>

            <form th:action="@{/registration}" method="post"
                  th:object="${user}">
                <div class="form-group">
                    <label class="control-label" for="firstName">
                        First Name </label>
                    <input id="firstName" class="form-control"
                           th:field="*{firstName}" required
                           autofocus="autofocus" />
                </div>

                <div class="form-group">
                    <label class="control-label" for="lastName">
                        Last Name </label> <input id="lastName"
                                                  class="form-control" th:field="*{lastName}"
                                                  required autofocus="autofocus" />
                </div>

                <div class="form-group">
                    <label class="control-label" for="email"> Email
                    </label> <input id="email" class="form-control"
                                    th:field="*{email}" required autofocus="autofocus"
                />
                </div>

                <div class="form-group">
                    <label class="control-label" for="password">
                        Password </label> <input id="password"
                                                 class="form-control" type="password"
                                                 th:field="*{password}" required
                                                 autofocus="autofocus" />
                </div>

                <div class="form-group">
                    <button type="submit" class="btn btn-primary">
                        Register</button>
                    <span>Already registered? <a href="/"
                                                 th:href="@{/login}">Login
                                here</a></span>
                </div>
            </form>
        </div>
    </div>
</div>
</body>
</html>

Local Setup and Run the application

Step 1: Download or clone the source code from GitHub to a local machine - Click here


Step 2: mvn clean install


Step 3: Run the Spring Boot application - mvn spring-boot:run

From the browser call the endpoint http://localhost:8080/

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Java Stream API - How to convert List of objects to another List of objects using Java streams?

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In this section, we will show you how to convert a List of objects to another List of objects in Java using the Java streams map(). The ‘map’ method maps each element to its corresponding result. Java Stream API   The Java Stream API provides a functional programming approach over the object oriented capabilities of Java. It is used for processing collections of objects. The Stream in Java can be defined as a sequence of elements from a source List, Set or Array. Most of the stream operations return a Stream. This avails engender a chain of stream operations(stream pipe-lining). The streams withal support the aggregate or terminal operations on the elements. for example, finding the sum or maximum element or finding the average etc...Stream operations can either be executed sequentially or parallel. when performed parallelly, it is called a parallel stream.   Stream map() Method   The Java 8 Stream map() is an intermediate operation. It converts Stream<obj1> to Stream<obj2>
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Registration and Login with Spring Boot + Spring Security + Thymeleaf

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In this section, we will learn how to create user registration and login using Spring boot, Spring security, Thymeleaf, JPA, and H2DB. The GitHub repository link is provided at the end of this tutorial. You can download the source code. Technologies used: Spring Boot 2.5.5  Spring Data JPA  Spring Security  Thymeleaf  Maven 3+  Java 17  H2 Database   User Interface User Registration Authentication Failed Authentication success Sign out Final Project Structure: Complete 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 https://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion >4.0.0</ modelVersion > < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-pare
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Java, Spring Boot Mini Project - Library Management System - Download

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Hello everyone, Hope you are doing well. Here, we provide a Library Management System mini-project for beginners, it's free for download. Maybe you can build more on top of this project and create your own product, that's all about you. The source code download link is provided at the end of this post. 1. Benefit of this project You could cover the following technologies and features by learning and debugging this mini project. Java 17 Java Stream Java Lamda Expressions Java Records Functional programming Object-oriented programming var Keyword in Java Generics in Java Java Switch Spring boot 2.6.4 Spring Security Thymeleaf template engine OpenCSV Spring Data JPA Server Side Pagination H2 Database  Bootstrap HTML CSS and more... 2. Objective Of Spring Boot On Library Management System The main objective of this project is to manage the details of the books, author, category, and publisher. Only Admin/Librarian will manage all these activities. Also, they can export the data in
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ReactJS, Spring Boot JWT Authentication Example

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In this tutorial, we’ll create a user registration & login example using ReactJS, Spring Boot, Spring Security, and JWT authentication. You could download the source code from our Github repository, the download link is provided at the end of this tutorial. Technologies used Backend Technologies: Java 17 Spring Boot 2.7.0 Spring Security Spring Data JPA JWT H2 Database Frontend Technologies: React 17.0.1 Axios 0.27.2 Redux 4.0.5 Bootstrap 4.5.2 ReactJS - SpringBoot - JWT - Flow Backend Project Directory: Frontend Project Directory: Following is the screenshot of our application - User Registration: User Signin: Profile View: Access Resource: We will build two projects:  1. Backend:   spring-boot-security-jwt 2. Frontend: react-redux-jwt Project 1: spring-boot-security-jwt 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"
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Top 5 Java ORM tools - 2024

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  The term ORM refers to object-relational mapping, which uses objects to adapt programming languages to database systems while allowing them to function with SQL and object-oriented programming ideas. Any kind of database management system that can accomplish object mapping to the table in the virtual system is suitable for the implementation of ORM. Java has a wide variety of ORM tools, some of which are mentioned below: 1. Hibernate Hibernate is a lightweight, open-source, non-invasive Java ORM (Object-Relational Mapping) framework that allows developers to create objects that function independently of database software and create persistence logic in any Java or JavaEE application. It offers an abstraction layer, so developers don't have to bother about implementations; Hibernate handles these tasks internally, such as connecting to databases and creating queries to carry out CRUD operations, among other things. Persistence logic development is done with it. Persistence logic r
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Java - Blowfish Encryption and decryption Example

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Blowfish is an encryption method developed by Bruce Schneier in 1993 as an alternative to the DES encryption method. It is significantly faster than DES and provides good encryption speed, although no effective cryptanalysis technique has been found to date. It is one of the first secure block ciphers that is not protected by any patents and is therefore freely available for anyone to use. This is a symmetric block cipher algorithm. Block size: 64 bits Key size: variable size from 32 to 448 bits number of subsections: 18 [P-array] number of rounds: 16 number of substitution blocks: 4 [each with 512 records of 32 bits each] develop  Example 1: Encryption and decryption using Blowfish import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Base64; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeExc
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Spring boot video streaming example-HTML5

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Hello everyone, Today we will learn how to stream MP4 video using Spring Boot and Spring Web Flux.  The Source code download link is provided at the end of this post. New, Quarkus Practice User Interface   Project Structure: G radle(build.gradle) plugins { id 'org.springframework.boot' version '2.5.4' id 'io.spring.dependency-management' version '1.0.11.RELEASE' id 'java' } group = 'com.knf.demo' version = '0.0.1-SNAPSHOT' sourceCompatibility = '11' repositories { mavenCentral() } dependencies { implementation 'org.springframework.boot:spring-boot-starter-webflux' testImplementation 'org.springframework.boot:spring-boot-starter-test' testImplementation 'io.projectreactor:reactor-test' } test { useJUnitPlatform() } Service (VideoStreamingService.java) package  com.knf.demo.service ; import org.springframework.beans.factory.annotation. Autowired ; import org.springframework
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Google Cloud Storage + Spring Boot - File Upload, Download, and Delete

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In this section, we will learn  how to  create a simple spring boot application to perform different file operations such as upload, download, list, and delete files from the Google Cloud Storage. 1.  A little bit of Background Google Cloud Storage Cloud Storage is a managed service for storing unstructured data. Store any amount of data and retrieve it as often as you like. More Info - click here! Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info - click here! 2. Create a GCP Project First, Sign into the Google console at  https://console.cloud.google.com . You can create a new project by first selecting the project dropdown in the top left and selecting " New Project ". Next, specify your GCP  Project name  and  Project ID . Then  Click on the " CREATE " button. Copy " Project ID " and keep it for future purposes. 3. Create a Google Cloud Storage bucket Fr
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