Spring Boot + Mustache Template + Spring Data JPA CRUD example

Hello everyone, In this post we will learn how to develop a CRUD web application, using Spring Boot, Mustache template, H2DB, and Spring Data JPA.



Technologies Used:

  • Java 17
  • Spring Boot 2.7.0
  • Maven 3+
  • Mustache
  • H2 Database
  • Bootstrap

Project Structure:


Dependency Management - Maven[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-parent</artifactId>
      <version>2.7.0</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.knf.dev.demo</groupId>
   <artifactId>springboot-mustache-crud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>springboot-mustache-crud</name>
   <description>Demo project for Spring Boot</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-mustache</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>

      <dependency>
         <groupId>com.h2database</groupId>
         <artifactId>h2</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-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>


Create the Entity class

@Entity
@Table(name = "UserData")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Column(name = "firstName")
    private String first_name;
    @Column(name = "lastName")
    private String last_name;
    @Column(name = "email", nullable = false, length = 200)
    private String email;

    public User() {
        super();
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getFirst_name() {
        return first_name;
    }
    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }
    public String getLast_name() {
        return last_name;
    }
    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
}



Create the CRUD Repository

@Repository
public interface UserRepository 
         extends CrudRepository<User, Long> {
}



Create the Service layer

@Service
public class UserService {
    @Autowired
    UserRepository repository;

    public List<User> getAllusers() {
        List<User> result = (List<User>) repository.findAll();
        if (result.size() > 0) {
            return result;
        } else {
            return new ArrayList<User>();
        }
    }

    public User getUserById(Long id)
              throws EntityNotFoundException {

        Optional<User> user = repository.findById(id);
        if (user.isPresent()) {
            return user.get();
        } else {
            throw new EntityNotFoundException
                    ("No user record exist for given id");
        }
    }

    public User createOrUpdateUser(User entity) {
        if (entity.getId() == null) {
            entity = repository.save(entity);
            return entity;
        } else {
            Optional<User> user = repository
                       .findById(entity.getId());
            if (user.isPresent()) {
                User newEntity = user.get();
                newEntity.setEmail(entity.getEmail());
                newEntity.setFirst_name(entity.getFirst_name());
                newEntity.setLast_name(entity.getLast_name());
                newEntity = repository.save(newEntity);
                return newEntity;
            } else {
                entity = repository.save(entity);
                return entity;
            }
        }
    }

    public void deleteUserById(Long id)
             throws EntityNotFoundException {
        
        Optional<User> user = repository.findById(id);
        if (user.isPresent()) {
            repository.deleteById(id);
        } else {
            throw new EntityNotFoundException
                     ("No user record exist for given id");
        }
    }
}



Create the Web Controller

@Controller
public class UserController {

    @Autowired
    private UserService userService;
    @GetMapping("/")
    public String getAllUserView(Model model) {
        List<User> users = userService.getAllusers();
        model.addAttribute("users", users);
        return "home";
    }
    @GetMapping("/create")
    public String createUserView(Model model) {
        User user = new User();
        model.addAttribute("user", user);
        model.addAttribute
                   ("isUpdate", false);
        return "create-update";
    }
    @PostMapping("/update/{id}")
    public String createUser(@ModelAttribute("user") User user,
                        @PathVariable("id") Long id) {

        user.setId(id);
        userService.createOrUpdateUser(user);
        return "redirect:/";
    }
    @GetMapping("/update/{id}")
    public String updateUser(Model model,
                @PathVariable("id") Long id)
                    throws EntityNotFoundException {

        User user = userService.getUserById(id);
        model.addAttribute("user", user);
        model.addAttribute
               ("isUpdate", true);
        return "create-update";
    }
    @PostMapping("/create")
    public String createUser
               (@ModelAttribute("user") User user) {
        
        userService.createOrUpdateUser(user);
        return "redirect:/";
    }
    @GetMapping("/delete/{id}")
    public String deleteUser(@PathVariable("id") Long id)
            throws EntityNotFoundException {
        
        userService.deleteUserById(id);
        return "redirect:/";
    }
}



Creating the Mustache templates

home.mustache

<!doctype html>
<head>
<title>Mustache Example</title>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1" name="viewport">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
    </script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
    </script>
</head>
<body>
<div class="container">
    <h2>Spring Boot + Mustache Simple CRUD Example</h2>
    <a href="/create" class="btn btn-primary" role="button">
     Add User</a>
    <table class="table">
        <thead >
        <tr>
            <th scope="col">Id</th>
            <th scope="col">First Name</th>
            <th scope="col">Last Name</th>
            <th scope="col">Email</th>
            <th scope="col"></th>
            <th scope="col"></th>
        </tr>
        </thead>
        <tbody>
        {{#users}}
        <tr>
            <th scope="row">{{id}}</th>
            <td>{{first_name}}</td>
            <td>{{last_name}}</td>
            <td>{{email}}</td>
          <td>
<a href="/update/{{id}}" class="btn btn-warning" role="button">
                Update</a></td>
            <td>
<a href="/delete/{{id}}" class="btn btn-danger" role="button">
                Delete</a></td>
        </tr>
        {{/users}}
        </tbody>
    </table>
</div>
</body>
</html>


create-update.mustache

<!doctype html>
<head>
    <title>Mustache Example</title>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1" name="viewport">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
    </script>
</head>
<body>
<div class="container">
    <h1>{{^isUpdate}}Create{{/isUpdate}}
        {{#isUpdate}}Update{{/isUpdate}}User</h1>
    <div>
        <form action="{{#isUpdate}}/update/{{user.id}}
        {{/isUpdate}}{{^isUpdate}}/create{{/isUpdate}}"
              name="user" method="post">
            <table class="table">
                <tbody>
                <thead>
                <tr>
                    <th>Field</th>
                    <th>Value</th>
                </tr>
                </thead>
                <tbody>
                {{#isUpdate}}
                <tr>
                    <td>ID</td>
                    <td><div name="id">{{user.id}}</div></td>
                </tr>
                {{/isUpdate}}
                {{#user}}
                <tr>
                    <th>First Name</th>
                    <td><input type="text" name="first_name"
     value="{{#first_name}}{{first_name}}{{/first_name}}" /></td>
                </tr>
                <tr>
                    <th>Last Name</th>
                    <td><input type="text" name="last_name"
     value="{{#last_name}}{{last_name}}{{/last_name}}" /></td>
                </tr>
                <tr>
                    <th>Email</th>
                    <td><input type="text" name="email"
             value="{{#email}}{{email}}{{/email}}" /></td>
                </tr>
                {{/user}}
                </tbody>
            </table>
       <button type="submit" class="btn btn-primary">Save</button>
        </form>
    </div>
</div>
</body>
</html>



Spring Boot Main Driver

@SpringBootApplication
public class SpringbootjpamustachecrudApplication {

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


Download the complete source code - click here                                     

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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