Spring Boot and Spring Data JPA Integration

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Spring Boot and Spring Data JPA Integration

This tutorial steps you through the process of creating a Spring Boot application connected to a PostgreSQL server

· Java Zone ·
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Nowadays, spring and JPA integration have become a piece of cake thanks to Spring Boot and spring Data.

I am going setup a postgresql server:

docker pull postgres
#run the container
docker run --name postgreslocal -e POSTGRES_PASSWORD=postgres -d postgres
#get the ip
docker inspect --format '{{ .NetworkSettings.IPAddress }}' postgreslocal
#get the port
docker inspect --format '{{ .NetworkSettings.Ports }}' postgreslocal

Create the employees Table:

create schema spring_data_jpa_example;

create table spring_data_jpa_example.employee(
firstnameTEXTNOT NULL,
 emailTEXT not null,
 salary real,

insert into spring_data_jpa_example.employee (firstname,lastname,email,age,salary) 
values ('Emmanouil','Gkatziouras','gkatzioura@gmail.com',18,3000.23);

Let’s begin with our gradle file:

group 'com.gkatzioura'
version '1.0-SNAPSHOT'

apply plugin: 'java'

sourceCompatibility = 1.8

buildscript {
 repositories {
 dependencies {

apply plugin: 'idea'
apply plugin: 'spring-boot'

repositories {

dependencies {
 compile("org.springframework.boot:spring-boot-starter-web") {
 exclude module: "spring-boot-starter-tomcat"

As you see, we added the c3p0 connection pool, the spring-boot-starter-data-jpa for hibernate and the postgres driver. That’s all we need.

The Application Class

package com.gkatzioura.springdata.jpa;

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

 * Created by gkatzioura on 6/2/16.
public class Application {

 public static void main(String[] args) {

 SpringApplication springApplication = new SpringApplication();
 ApplicationContext ctx = springApplication.run(Application.class, args);

The DataSource Configuration

package com.gkatzioura.springdata.jpa.config;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

 * Created by gkatzioura on 6/2/16.
public class DataSourceConfig {

 public DataSource createDataSource() throws Exception {

 ComboPooledDataSource ds = new ComboPooledDataSource();

 return ds;


The Employee entity

package com.gkatzioura.springdata.jpa.persistence.entity;

import javax.persistence.*;

 * Created by gkatzioura on 6/2/16.
@Table(name = "employee", schema="spring_data_jpa_example")
public class Employee {

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

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

 @Column(name = "lastname")
 private String lastname;

 @Column(name = "email")
 private String email;

 @Column(name = "age")
 private Integer age;

 @Column(name = "salary")
 private Integer salary;

 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 Integer getAge() {
 return age;

 public void setAge(Integer age) {
 this.age = age;

 public Integer getSalary() {
 return salary;

 public void setSalary(Integer salary) {
 this.salary = salary;

The employee repository

package com.gkatzioura.springdata.jpa.persistence.repository;

import com.gkatzioura.springdata.jpa.persistence.entity.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

 * Created by gkatzioura on 6/2/16.
public interface EmployeeRepository extends JpaRepository<Employee,Long>{

And a controller that will fetch all the data

package com.gkatzioura.springdata.jpa.controller;

import com.gkatzioura.springdata.jpa.persistence.entity.Employee;
import com.gkatzioura.springdata.jpa.persistence.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

 * Created by gkatzioura on 6/2/16.
public class TestController {

 private EmployeeRepository employeeRepository;

 public List<Employee> getTest() {

 return employeeRepository.findAll();

Pretty convenient considering the dependencies and the XML configuration overhead of the past.

You can find the source code on GitHub.

aws, jms, spring, sqs

Published at DZone with permission of Emmanouil Gkatziouras , DZone MVB. See the original article here.

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