# Spring Boot- Hibernate-REST Integration

# Add REST support

  1. Add spring-boot-starter-web dependency to pom.xml. You may skip version tag, if you are using spring-boot-starter-parent as the parent of your pom.xml (reference).

   <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

  • Add REST controller to desired package, for example to **com.example.myproject.web.rest** ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#getting-started-first-application-code)):
    package com.example.myproject.web.rest;
    
    import java.util.Map;
    import java.util.HashMap;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.servlet.http.HttpServletRequest;
    
    @RestController
    public class VersionController {
        @RequestMapping("/api/version")
        public ResponseEntity get() {
            final Map<String, String> responseParams = new HashMap();
            responseParams.put("requestStatus", "OK");
            responseParams.put("version", "0.1-SNAPSHOT");
    
            return ResponseEntity.ok().body(responseParams.build());
        }
    }    
    
    
  • Start Spring Boot application ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#getting-started-first-application-run)).
  • Your controller is accessible at the address **[http://localhost:8080/api/version](http://localhost:8080/api/version)**.
  • # Add Hibernate support

    1. Add spring-boot-starter-data-jpa dependency to pom.xml. You may skip version tag, if you are using spring-boot-starter-parent as the parent of your pom.xml. The dependency below brings Hibernate and everything related to JPA to your project (reference).
    
       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
    
    
  • Add database driver to **pom.xml**. This one below is for H2 database ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-embedded-database-support)).
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
    </dependency>
    
    
  • Enable debug logging for Hibernate in **application.properties** logging.level.org.hibernate.SQL = debug
  • or in application.yml

    logging:
      level:
        org.hibernate.SQL: debug
    
    
  • Add entity class to desired package under **${project.home}/src/main/java/**, for example under **com.example.myproject.domain** ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-entity-classes)):
    package com.example.myproject.domain;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import java.io.Serializable;
    
    @Entity
    public class City implements Serializable {
    
        @Id
        @GeneratedValue
        public Long id;
    
        @Column(nullable = false)
        public String name;
    }
    
    
  • Add **import.sql** to **${project.home}/src/main/resources/**. Put **INSERT** statements into the file. This file will be used for database schema population on each start of the app ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#howto-initialize-a-database-using-hibernate)):
    insert into city(name) values ('Brisbane');
    
    insert into city(name) values ('Melbourne');
    
    
  • Add Repository class to desired package under **${project.home}/src/main/java/**, for example under **com.example.myproject.service** ([reference](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-spring-data-jpa-repositories)):
    package com.example.myproject.service;
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import java.io.Serializable;
    
    import com.example.myproject.domain.City;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.Pageable;
    import org.springframework.data.repository.Repository;
    
    interface CityRepository extends Repository<City, Long> {
    
        Page<City> findAll(Pageable pageable);
    
        Page<City> findByName(String name);
    }
    
    
  • Basically that's it! At this point you already can access the database using the methods of com.example.myproject.service.CityRepository.