Welcome readers, in this tutorial, we will integrate Hibernate with a Spring Boot application.

1. Introduction

• Spring Boot is a module that provides rapid application development feature to the spring framework includingauto-configuration,standalone-code, andproduction-ready code
• It creates applications that are packaged asjar and are directly started using embedded servlet container (such as Tomcat, Jetty or Undertow). Thus, no need to deploy thewar files
• It simplifies the maven configuration by providing the starter template and helps to resolve the dependency conflicts. It automatically identifies the required dependencies and imports them in the application
• It helps in removing the boilerplate code, extra annotations, and xml configurations
• It provides a powerful batch processing and manages the rest endpoints
• It provides an efficientjpa-starter library to effectively connect the application with the relational databases

1.1 What is Hibernate?

• Object-Relational Mapping or ORM is the programming technique to map application domain model objects to the relational database tables
• Hibernate is a Java-based ORM tool that provides the framework for mapping application domain objects to the relational database tables and vice versa. It provides the reference implementation of the Java Persistence API that makes it a great choice as an ORM tool with benefits of loose coupling
• A Framework that an option to map plain old Java objects to the traditional database tables with the use of JPA annotations as well asXML based configuration

Now, open the eclipse ide and let’s see how to implement this tutorial in spring boot.

2. Spring Boot with Hibernate Example

Here is a systematic guide for implementing this tutorial.

2.1 Tools Used

We are using Eclipse Kepler SR2, JDK 8, MySQL, and Maven.

2.2 Project Structure

In case you are confused about where you should create the corresponding files or folder, let us review the project structure of the spring boot application.

2.3 Project Creation

This section will demonstrate how to create a Java-based Maven project with Eclipse. In Eclipse IDE, go toFile -> New -> Maven Project.

In the New Maven Project window, it will ask you to select a project location. By default, ‘Use default workspace location’ will be selected. Just click on the next button to proceed.

Select the Maven Web App archetype from the list of options and click next.

It will ask you to ‘Enter the group and the artifact id for the project’. We will input the details as shown in the below image. The version number will be by default:0.0.1-SNAPSHOT.

Click on Finish and the creation of a maven project is completed. If you observe, it has downloaded the maven dependencies and apom.xml file will be created. It will have the following code:

pom.xml

<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>jcg.tutorial</groupId><artifactId>Springboothibernatetutorial</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging></project>

Let’s start building the application!

3. Creating a Spring Boot application

Below are the steps involved in developing the application. But before starting we are assuming that developers have installed the MySQL on their machine.

3.1 Maven Dependencies

Here, we specify the dependencies for the Spring Boot and MySQL. Maven will automatically resolve the other dependencies. Theupdated file will have the following code.

pom.xml

<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>jcg.tutorial</groupId><artifactId>Springboothibernatetutorial</artifactId><packaging>war</packaging><version>0.0.1-SNAPSHOT</version><name>Springboot hibernate tutorial</name><url>http://maven.apache.org</url><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.4.RELEASE</version></parent><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-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency></dependencies><build><finalName>Springboothibernatetutorial</finalName></build></project>

3.2 Configuration Files

Create a new properties file at the location:Springboothibernatetutorial/src/main/resources/ and add the following code to it.

application.properties

# Application configuration.server.port=8102# Local mysql database configuration.datasource.driver-class-name=com.mysql.cj.jdbc.Driverdatasource.url= jdbc:mysql://localhost:3306/springhibernatedbdatasource.username= rootdatasource.password=# Hibernate configuration.hibernate.show_sql=truehibernate.hbm2ddl.auto=create-drophibernate.dialect=org.hibernate.dialect.MySQL5Dialect# Package to scan.packagesToScan= jcg

3.3 Java Classes

Let’s write all the java classes involved in this application.

3.3.1 Implementation/Main class

Add the following code the main class to bootstrap the application from the main method. Always remember, the entry point of the spring boot application is the class containing@SpringBootApplication annotation and thestatic main method.

Myapplication.java

package jcg;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * Main implementation class which serves two purpose in a spring boot application: Configuration and bootstrapping. * @author yatin-batra */@SpringBootApplicationpublic class Myapplication {public static void main(String[] args) {SpringApplication.run(Myapplication.class, args);}}

3.3.2 Hibernate configuration

Add the following code to the Hibernate configuration to initialize the Hibernate’s Session-factory object and handle the sql operations.

HibernateConfig.java

package jcg.config;import java.util.Properties;import javax.sql.DataSource;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.env.Environment;import org.springframework.jdbc.datasource.DriverManagerDataSource;import org.springframework.orm.hibernate5.LocalSessionFactoryBean;@Configurationpublic class HibernateConfig {@Autowiredprivate Environment env;@Beanpublic LocalSessionFactoryBean sessionFactory() {LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();sessionFactory.setDataSource(dataSource());sessionFactory.setPackagesToScan(env.getProperty("packagesToScan"));sessionFactory.setHibernateProperties(hibernateProperties());return sessionFactory;}@Beanpublic DataSource dataSource() {DriverManagerDataSource  ds = new DriverManagerDataSource ();ds.setDriverClassName(env.getProperty("datasource.driver-class-name"));ds.setUrl(env.getProperty("datasource.url"));ds.setUsername(env.getProperty("datasource.username"));ds.setPassword(env.getProperty("datasource.password"));return ds;}private final Properties hibernateProperties() {Properties hibernate = new Properties();hibernate.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));hibernate.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));hibernate.setProperty("hibernate.show_sql", env.getProperty("hibernate.show_sql"));return hibernate;}}

3.3.3 Model class

Add the following code to the product model class.

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Book.java

package jcg.model;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.Table;import javax.validation.constraints.NotBlank;// Model class.@Entity@Table(name = "book")public class Book {@Id@GeneratedValue(strategy= GenerationType.IDENTITY)private int id;@NotBlankprivate String title;@NotBlankprivate String author;public Book() { }public int getId() {return id;}public void setId(int id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}}

3.3.4 Data-Access-Object class

Add the following code the Dao class designed to handle the database interactions. The class is annotated with the@Repository annotation.

BookDao.java

package jcg.repository;import java.util.List;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Repository;import jcg.model.Book;// Database repository class.@Repositorypublic class BookDao {@Autowiredprivate SessionFactory sf;// Save book in the db.public Integer createBook(Book book) {Session s = sf.getCurrentSession();s.beginTransaction();Integer id = (Integer) s.save(book);s.getTransaction().commit();return id;}// Get all books.@SuppressWarnings({ "deprecation", "unchecked" })public List<Book> findAll() {Session s = sf.getCurrentSession();List<Book> list = s.createCriteria(Book.class).list();return list;}// Find book by id.public Book findById(int bookid) {Session s = sf.getCurrentSession();Book book = s.get(Book.class, bookid);return book;}}

3.3.5 Controller class

Add the following code to the controller class designed to handle the incoming requests. The class is annotated with the@RestController annotation where every method returns a domain object as a json response instead of a view.

BookCtrl.java

package jcg.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import jcg.model.Book;import jcg.repository.BookDao;// Controller class.@RestController@RequestMapping(value="/springhibernateapi")public class BookCtrl {@Autowiredprivate BookDao bookdao;// Create a new record in database.@PostMapping(value= "/create")public ResponseEntity<Book> create(@RequestBody Book book) {int id = bookdao.createBook(book);if(id != 0)return new ResponseEntity<Book>(HttpStatus.CREATED);return new ResponseEntity<Book>(HttpStatus.INTERNAL_SERVER_ERROR);}// Fetch all books from the database.@GetMapping(value= "/getall")public ResponseEntity<List<Book>> findAll() {return ResponseEntity.ok(bookdao.findAll());}// Fetch particular book from the database.@GetMapping(value= "/get/{id}")public ResponseEntity<Book> getBookById(@PathVariable("id") int bookid) {Book book = bookdao.findById(bookid);if(book == null)return new ResponseEntity<Book>(HttpStatus.NOT_FOUND);return new ResponseEntity<Book>(book, HttpStatus.OK);}}

4. Run the Application

As we are ready with all the changes, let us compile the spring boot project and run the application as a java project. Right click on theMyapplication.java class,Run As -> Java Application.

Developers can debug the example and see what happens after every step. Enjoy!

5. Project Demo

Open thepostman tool and hit the following urls to display the data in the json format.

// Create bookhttp://localhost:8102/springhibernateapi/create// Get all bookshttp://localhost:8102/springhibernateapi/getall// Get book by idhttp://localhost:8102/springhibernateapi/get/1

That is all for this tutorial and I hope the article served you whatever you were looking for. Happy Learning and do not forget to share!

6. Conclusion

In this section, developers learned how to integrate Hibernate with Spring Boot application and perform the basic sql operations. Developers can download the sample application as an Eclipse project in theDownloads section.

7. Download the Eclipse Project

This was an example of implementing Hibernate in Spring Boot.

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