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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

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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.

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