Let’s create an application which will use spring data jpa to store the user into the database.

First we need to create the 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>com.springdatajpa</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <spring.data.version>1.8.0.RELEASE</spring.data.version>
        <org.hibernate.version>4.3.10.Final</org.hibernate.version>
    </properties>

    <!-- Spring Boot dependency management-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.4.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>

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

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

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <showDeprecation>true</showDeprecation>
                    <showWarnings>true</showWarnings>
                    <fork>true</fork>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

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Now we need to create the User.java entity which will be saved into the database.

package com.springjpa.example;

import javax.persistence.*;

@Entity
@Table(name = "user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(name = "name", nullable = false)
    private String name;

    public User() {

    }

    public User(String name) {
        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;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

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After this we need to create the UserRepository.java

package com.springjpa.example;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

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

    /**
     * 
     * @param id the user id
     * @return the User entity for specified id
     */
    User findById(final Long id);

}

And the finally we need to create the Application.java which will run the SpringBoot Application.

package com.springjpa.example;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Application {

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

    @Bean
    public CommandLineRunner commandLineRunner(UserRepository repository) {
        return (args) -> {

            // save some users
            repository.save(new User("user1"));
            repository.save(new User("user2"));
            repository.save(new User("user3"));

            // get all users
            System.out.println("Getting all users...");
            repository.findAll().forEach(System.out::println);

            // get the user by id
            System.out.println("Get the user by id");
            User user = repository.findById(1L);
            System.out.println(user);

        };
    }
}

In the console you should see following:

Getting all users...
User{id=1, name='user1'}
User{id=2, name='user2'}
User{id=3, name='user3'}
Get the user by id
User{id=1, name='user1'}

You can download the source code from the github.