Spring Boot with Swagger UI , JPA , MYSQL , Mockito, Integration Test and Sonar Qube

This post will expain you about
1. How we will integrate spring boot and swagger api
2. Spring boot with JPA and MySQL (Crud Repository and NamedJdbcTemplate)
3 Spring mockMvc test for controller
4. Integration test for Service and DAO classes
5. Usage of Mockito
6. Sonarqube Code coverage

Step 1 : create a maven project called - springboot-jpa-swagger-mysql-sonarqube in eclipse
Step 2 : provide groupId,artifactId,version,jar,name and description
Step 3: Replace below pom.xml into your local system
pom.xml will have dependencies related to spring boot,swagger,jdbc,mysql,mockito,sonarqube

 4.0.0

 com.siva.springboot.javaguruonline
 springboot-jpa-swagger-mysql-sonarqube
 0.0.1-SNAPSHOT
 jar

 springboot-jpa-swagger-mysql-sonarqube
 Demo project for Spring Boot PJA MySQL AND Sonarqube

 
  org.springframework.boot
  spring-boot-starter-parent
  2.0.5.RELEASE
  
 

 
  UTF-8
  UTF-8
  1.8
 

 
  
   org.springframework.boot
   spring-boot-starter-data-jpa
  
  
   org.springframework.boot
   spring-boot-starter-web
  

  
   org.springframework.boot
   spring-boot-starter-test
   test
  

  
   mysql
   mysql-connector-java
   runtime
  
  
  
   io.springfox
   springfox-swagger2
   2.8.0
  
  
   io.springfox
   springfox-swagger-ui
   2.8.0
  
  
   io.springfox
   springfox-bean-validators
   2.8.0
  
  
   javax.xml
   jaxb-api
   2.1
  
  
   org.projectlombok
   lombok
   1.18.12
   provided
  

  
  
   org.sonarsource.scanner.maven
   sonar-maven-plugin
   3.0.2
  
 

 
  
   
    org.springframework.boot
    spring-boot-maven-plugin
   
   
    org.codehaus.mojo
    sonar-maven-plugin
    3.0.2
   
   
    org.jacoco
    jacoco-maven-plugin
    0.8.0
    
     
      default-prepare-agent
      
       prepare-agent
      
     
     
      default-report
      prepare-package
      
       report
      
     
    
   
  
 

Step 4: Now create a Springboot application, which is the starting point to run the Application.

Step 5: create appliaction.properties under resources folder, add the db related details

## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url = jdbc:mysql://localhost:3306/employee
spring.datasource.username = root
spring.datasource.password = root


## Hibernate Properties
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update

logging.level.root = DEBUG

spring.main.banner-mode=off
spring.datasource.platform=h2

Step 5: Create a SwaggerConfig class, which will have the details , what is controller package and other details
Learn more about Swagger API swagger-ui

package com.siva.springboot.javaguruonline.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class Swagger2Config {
 @Bean
 public Docket api() {
  return new Docket(DocumentationType.SWAGGER_2).select()
    .apis(RequestHandlerSelectors
      .basePackage("com.siva.springboot.javaguruonline.controller"))
    .paths(PathSelectors.regex("/.*"))
    .build().apiInfo(apiEndPointsInfo());
 }

 private ApiInfo apiEndPointsInfo() {

  return new ApiInfoBuilder().title("Spring Boot REST API")
    .description("Employee Management REST API")
    .contact(new Contact("Siva Raju", "http://www.javaguruonline.com", "siva82k@gmail.com"))
    .license("Apache 2.0")
    .licenseUrl("http://www.apache.org/licenses/LICENSE-2.0.html")
    .version("1.0.0")
    .build();
 }
}

Step 6 : This project is related to employee management system - like Employee CRUD operations

Step 7 : Write Model class called Employee and EmployeeDetails

package com.siva.springboot.javaguruonline.model;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.EqualsAndHashCode;
import lombok.ToString;

@Entity
@Table(name = "employee")
@ApiModel(description="All details about the Employee. ")
@ToString
@EqualsAndHashCode
public class Employee implements Serializable{

 /**
  * 
  */
 private static final long serialVersionUID = 7407317371057056536L;

 @ApiModelProperty(notes = "The database generated employee ID")
 private int id;

 @ApiModelProperty(notes = "The employee name")
 private String name;

 @ApiModelProperty(notes = "The employee age")
 private int age;

 public Employee() {

 }

 public Employee(String name, int age) {
  this.name = name;
  this.age = age;
 }

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 @Column(name = "emp_id", nullable = false)
 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 @Column(name = "emp_name", nullable = false)
 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }
 @Column(name = "email_age", nullable = false)
 public int getAge() {
  return age;
 }

 public void setAge(int age) {
  this.age = age;
 }

}

package com.siva.springboot.javaguruonline.model;

import lombok.EqualsAndHashCode;
import lombok.ToString;

@ToString
@EqualsAndHashCode
public class EmployeeDetails {
 
 private int empId;
 public int getEmpId() {
  return empId;
 }
 public void setEmpId(int empId) {
  this.empId = empId;
 }
 public String getEmpName() {
  return empName;
 }
 public void setEmpName(String empName) {
  this.empName = empName;
 }
 private String empName;

}

Step 8: Step 8: service/serviceimpl and repository classes

In the repository class, It is extending the JpaRepository, which will get all the default methods related to that Model Object.
In the DAO class, NamedParameterJdbcTemplate , to work with native query and how to map using rowmapper

package com.siva.springboot.javaguruonline.repository;

import java.util.List;

import com.siva.springboot.javaguruonline.model.EmployeeDetails;

public interface EmployeeDao {
 
 public List getEmployeeDetails();
 

}

package com.siva.springboot.javaguruonline.repository;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Repository;

import com.siva.springboot.javaguruonline.mapper.EmployeeDetailsMapper;
import com.siva.springboot.javaguruonline.model.EmployeeDetails;

@Repository
public class EmployeeDaoImpl implements EmployeeDao{
 String sqlQuery="select emp_id,emp_name from employee";
 @Autowired
 private NamedParameterJdbcTemplate namedParameterJdbcTemplate;

 @Override
 public List getEmployeeDetails() {
  return namedParameterJdbcTemplate.query(sqlQuery, new EmployeeDetailsMapper());
 }

}

package com.siva.springboot.javaguruonline.mapper;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.RowMapper;

import com.siva.springboot.javaguruonline.model.EmployeeDetails;

public class EmployeeDetailsMapper implements RowMapper {
 @Override
 public EmployeeDetails mapRow(ResultSet resultset, int count) throws SQLException {
  EmployeeDetails employeeDetails = new EmployeeDetails();
  employeeDetails.setEmpId(resultset.getInt("emp_id"));
  employeeDetails.setEmpName(resultset.getString("emp_name"));
  return employeeDetails;
 }
 

}

package com.siva.springboot.javaguruonline.repository;

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

import com.siva.springboot.javaguruonline.model.Employee;

@Repository
public interface EmployeeRepository extends JpaRepository{

}

Step 9: Write Controller class, which will have the all the crud operations

package com.siva.springboot.javaguruonline.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
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.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.siva.springboot.javaguruonline.exception.ResourceNotFoundException;
import com.siva.springboot.javaguruonline.model.Employee;
import com.siva.springboot.javaguruonline.model.EmployeeDetails;
import com.siva.springboot.javaguruonline.repository.EmployeeDao;
import com.siva.springboot.javaguruonline.repository.EmployeeRepository;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;


@RestController
@RequestMapping("/api/v1")
@Api(value="Employee Management System")
public class EmployeeController {
 private static final String EMPLOYEE_NOT_FOUND_FOR_THIS_ID = "Employee not found for this id :: ";

 @Autowired
 private EmployeeRepository employeeRepository;
 
 @Autowired
 private EmployeeDao employeeDao;

 @ApiOperation(value = "View a list of available employees", response = List.class)
 @ApiResponses(value = { @ApiResponse(code = 200, message = "Successfully retrieved list"),
   @ApiResponse(code = 401, message = "You are not authorized to view the resource"),
   @ApiResponse(code = 403, message = "Accessing the resource you were trying to reach is forbidden"),
   @ApiResponse(code = 404, message = "The resource you were trying to reach is not found") })
 @GetMapping("/employees")
 public List getAllEmployees() {
  return employeeRepository.findAll();
 }
 
 @ApiOperation(value = "View a list of available employee details", response = List.class)
 @ApiResponses(value = { @ApiResponse(code = 200, message = "Successfully retrieved list"),
   @ApiResponse(code = 401, message = "You are not authorized to view the resource"),
   @ApiResponse(code = 403, message = "Accessing the resource you were trying to reach is forbidden"),
   @ApiResponse(code = 404, message = "The resource you were trying to reach is not found") })
 @GetMapping("/employeedetails")
 public List getAllEmployeeDetails() {
  return employeeDao.getEmployeeDetails();
 }

 @ApiOperation(value = "Get an employee by Id")
 @GetMapping("/employees/{id}")
 public ResponseEntity getEmployeeById(
   @ApiParam(value = "Employee id from which employee object will retrieve", required = true)
   @PathVariable(value = "id") Long employeeId)
   throws ResourceNotFoundException {
  Employee employee = employeeRepository.findById(employeeId)
    .orElseThrow(() -> new ResourceNotFoundException(EMPLOYEE_NOT_FOUND_FOR_THIS_ID + employeeId));
  return ResponseEntity.ok().body(employee);
 }

 @ApiOperation(value = "Add an employee")
 @PostMapping("/employees")
 public Employee createEmployee(
   @ApiParam(value = "Employee object store in database table", required = true)
   @Valid @RequestBody Employee employee) {
  return employeeRepository.save(employee);
 }

 @ApiOperation(value = "Update an employee")
 @PutMapping("/employees/{id}")
 public ResponseEntity updateEmployee(
   @ApiParam(value = "Employee Id to update employee object", required = true)
   @PathVariable(value = "id") Long employeeId,
   @ApiParam(value = "Update employee object", required = true)
   @Valid @RequestBody Employee employeeDetails) throws ResourceNotFoundException {
  Employee employee = employeeRepository.findById(employeeId)
    .orElseThrow(() -> new ResourceNotFoundException(EMPLOYEE_NOT_FOUND_FOR_THIS_ID + employeeId));

  employee.setName(employeeDetails.getName());
  employee.setAge(employeeDetails.getAge());
  final Employee updatedEmployee = employeeRepository.save(employee);
  return ResponseEntity.ok(updatedEmployee);
 }

 @ApiOperation(value = "Delete an employee")
 @DeleteMapping("/employees/{id}")
 public Map deleteEmployee(
   @ApiParam(value = "Employee Id from which employee object will delete from database table", required = true)
   @PathVariable(value = "id") Long employeeId)
   throws ResourceNotFoundException {
  Employee employee = employeeRepository.findById(employeeId)
    .orElseThrow(() -> new ResourceNotFoundException(EMPLOYEE_NOT_FOUND_FOR_THIS_ID + employeeId));

  employeeRepository.delete(employee);
  Map response = new HashMap<>();
  response.put("deleted", Boolean.TRUE);
  return response;
 }
}

Step 10: Once above code has been completed, then you can run the application by right clicking on the Springboot application.
Step 11. Once the application executed successfully, then we need to test this application

One way is either Using- SOAP UI, Postman - these needs to be installed on our machine, else we can't test the rest service.
To test the REST API, we already configured Swagger UI. So just go to your web browser, then click, http://localhost:8080/swagger-ui.html - it will display all the operations, which is availabe in controller class.


Now you can test those API's by giving request parameters



Step 12: Once done, we need to write Junit test cases for the all the classes

package com.siva.springboot.javaguruonline;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootJpaSwaggerSonarqubeApplicationTest {

 @Test
 public void contextLoads() {
 }

}

Controller class test

package com.siva.springboot.javaguruonline.controller;

import static org.hamcrest.Matchers.hasSize;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.meta.When;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.web.servlet.MockMvc;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.siva.springboot.javaguruonline.SpringbootJpaSwaggerSonarqubeApplication;
import com.siva.springboot.javaguruonline.model.Employee;
import com.siva.springboot.javaguruonline.model.EmployeeDetails;
import com.siva.springboot.javaguruonline.repository.EmployeeDaoImpl;
import com.siva.springboot.javaguruonline.repository.EmployeeRepository;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,classes=SpringbootJpaSwaggerSonarqubeApplication.class)
@AutoConfigureMockMvc
public class EmployeeControllerTest {
 @Autowired
 private MockMvc mockMvc;
 
 @Autowired
 private EmployeeRepository employeeRepository;
 @Mock
 private EmployeeDaoImpl employeeDao;
 
 
 @Test
 public void testGetAllEmployees() throws Exception{
  List employeeList  = employeeRepository.findAll();
  ObjectMapper mapper = new ObjectMapper();
  String jsonString = mapper.writeValueAsString(employeeList);
  FileWriter file = new FileWriter(new File("employee.json"));
  file.write(jsonString);
  file.close();
  this.mockMvc.perform(get("/api/v1/employees")).andExpect(status().isOk()).andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8))
  .andExpect(jsonPath("$", hasSize(4)));

 } 
 
 @Test
 public void testGetAllEmployeeDetails()  throws Exception {
  EmployeeDetails employee = new EmployeeDetails();
  employee.setEmpId(123);
  employee.setEmpName("Siva");
  List employeeList = new ArrayList();
  employeeList.add(employee);
  when(employeeDao.getEmployeeDetails()).thenReturn(employeeList);
  this.mockMvc.perform(get("/api/v1/employeedetails")).andExpect(status().isOk()).andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8))
  .andExpect(jsonPath("$", hasSize(4)));
  
 }

}

DaoImpl Test

package com.siva.springboot.javaguruonline.repository;

import java.util.List;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.siva.springboot.javaguruonline.SpringbootJpaSwaggerSonarqubeApplication;
import com.siva.springboot.javaguruonline.model.EmployeeDetails;
import com.siva.springboot.javaguruonline.repository.EmployeeDao;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootJpaSwaggerSonarqubeApplication.class)
public class EmployeeDaoImplTest {
 
 @Autowired
 public EmployeeDao employeeDao;
 
 @Test
 public void testGetAllEmployeeDetails(){
  List employeeDetails = employeeDao.getEmployeeDetails();
  Assert.assertNotNull(employeeDetails);
 }

}

Repository Test

package com.siva.springboot.javaguruonline.repository;

import java.util.List;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.siva.springboot.javaguruonline.SpringbootJpaSwaggerSonarqubeApplication;
import com.siva.springboot.javaguruonline.model.Employee;
import com.siva.springboot.javaguruonline.repository.EmployeeRepository;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootJpaSwaggerSonarqubeApplication.class)
public class EmployeeRepositoryTest {
 @Autowired
 EmployeeRepository employeeRepository;
 
 @Test
 public void getEmployeeDetails(){
  List employeeList = employeeRepository.findAll();
  Assert.assertNotNull("EmployeeListNotEmpty", employeeList);;
 }
 

}

Step 13: We need to check the code coverage tool called Sonarqube, required dependencies added in pom.xml

Step 14: Download Sonarqube from SonarQube - and look for Historical Downloads, then download , which ever the version you want to work on.


Step 15 : Unzip that file and go to bin folder- StartSonar.bat file

Step 16 : Once Sonar is up, then go to browser and try http://localhost:9000 , login with username -admin and password- admin

Step 17: Once Sonarqube is up and running, we need to run the code through either sonar scanner or maven

Before Scanning the code, we need to create properties file called - sonar-project.properties place the inside of the your project
and need to mention src code path , test path, java version.. etc

# must be unique in a given SonarQube instance
sonar.projectKey=springboot-jpa-swagger-mysql-sonarqube
# this is the name displayed in the SonarQube UI
sonar.projectName=springboot-jpa-swagger-mysql-sonarqube
sonar.projectVersion=1.0


# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
# Since SonarQube 4.2, this property is optional if sonar.modules is set. 
# If not set, SonarQube starts looking for source code from the directory containing 
# the sonar-project.properties file.
sonar.sources=/src/main/java/
 
# Encoding of the source code. Default is default system encoding
sonar.sourceEncoding=UTF-8

sonar.junit.reportPaths=./target/surefire-reports
# Generate sonar issues report in html and console
sonar.issuesReport.html.enable=true
sonar.issuesReport.console.enable=true

# Display Jacoco report into SonarQube dashboard
# Comma-separated paths to directories with tests (optional)
sonar.tests=/src/test/java/
# This name depends on the configuration in pom.xml. In this example we have ${project.build.directory}/coverage-reports/jacoco-ut.exec entry in our pom.xml
sonar.jacoco.reportPath=target/surefire-reports/jacoco-ut.exec
sonar.dynamicAnalysis=reuseReports
sonar.java.coveragePlugin=jacoco
sonar.jacoco.reportMissing.force.zero=true
sonar.java.binaries=/target/classes/
sonar.coverage.exclusions=**/*Employee.java,**/*EmployeeDetails.java,**/*ErrorDetails.java,**/*ErrorDetails.java,**/*ResourceNotFoundException.java

Step 18 : Use the below command to run the code coverage- make sure before running the sonar, sonarqube should up and running
Go to your project location in the command prompt.
/>mvn clean install sonar:sonar

CRUD (Create, Read,Update,Delete) operations with Spring Boot , Mysql, JPA , Hibernate with in built Tomcat server.

This post will explain you. How to work with Spring boot and Mysql CRUD(create,read,update,delete) operations
Step 1: Open eclipse and create a java project.. more details please check my previous post getting started with spring boot.

Step 2: create a new pom.xml file under project and the below code to that file.

       

    4.0.0

    org.springframework
    spring_boot_first
    0.1.0

  
        org.springframework.boot
        spring-boot-starter-parent
        1.5.1.RELEASE

 
    
     
                   org.springframework.boot
                   spring-boot-starter-web
            
     
                   org.springframework.boot
                   spring-boot-starter-tomcat
             
      
                    org.springframework.boot
                    spring-boot-starter-security
       
       
                     org.springframework.boot
                     spring-boot-starter-data-jpa
        
                             
                                     org.apache.tomcat
                                     tomcat-jdbc
                              
                        
  
  
                       mysql
                       mysql-connector-java
                
   
                         commons-dbcp
                         commons-dbcp
  
  
    
      
        1.8
    



   

Step 3:Create new model object called User.

 package springboot.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table
public class User {
 @Id
 @Column
 private long id;
 @Column
 private String name;
 @Column
 private String gender;
 @Column
 private String country;
 @Column
 private String password;
 
 
 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;
 }
 public String getGender() {
  return gender;
 }
 public void setGender(String gender) {
  this.gender = gender;
 }
 public String getCountry() {
  return country;
 }
 public void setCountry(String country) {
  this.country = country;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }


}

Step 4: Create UserService and UserServiceImpl under package springboot.service

  package springboot.service;

import java.util.List;

import springboot.model.User;

public interface UserService {

   public List getUsers();
   public List createOrUpdateUser( User user);
   public List deleteUser( User user);
   
 
}

Step 5: Add below code in UserServiceImpl.

  package springboot.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import springboot.dao.UserDAO;
import springboot.model.User;

@Component
public class UserServiceImpl implements UserService{

 @Autowired
 private UserDAO userDAO;
 
 @Override
 public List getUsers() {
  return userDAO.getUsers();
 }
 
 public List createOrUpdateUser( User user){
  return userDAO.createOrUpdateUser(user);
 }
   public List deleteUser( User user){
    return userDAO.deleteUser(user);
   }

 public void setUserDAO(UserDAO userDAO) {
  this.userDAO = userDAO;
 }

}

Step 6: Create UserDAO and UserDAOImpl under package springboot.dao as mentioned below

 package springboot.dao;

import java.util.List;

import javax.transaction.Transactional;

import org.springframework.data.repository.CrudRepository;

import springboot.model.User;

@Transactional
public interface UserDAO {
 public List getUsers();
 public List createOrUpdateUser( User user);
 public List deleteUser( User user);

}

Step 7: Add below code inside UserDAOImpl

 package springboot.dao;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import springboot.model.User;

@Component
public class UserDAOImpl implements UserDAO{
 
 @Autowired
 private SessionFactory sessionFactory;

 public List getUsers(){
  Criteria criteria = sessionFactory.openSession().createCriteria(User.class);
  return criteria.list();
 }
 
 public List createOrUpdateUser( User user){
  Session session = sessionFactory.openSession();
  User oldUser = session.get(User.class, user.getId() );
  //System.out.println("oldUser id["+ oldUser.getId()+"]");
  if(oldUser == null){
   session.save(user);
   session.flush();
   System.out.println("Created or Update Successful");
    }
  Criteria criteria = sessionFactory.openSession().createCriteria(User.class);
  return criteria.list();
 }
 public List deleteUser( User user){
  Session session = sessionFactory.openSession();
  User oldUser = session.get(User.class, user.getId() );
  if(oldUser != null){
   session.delete(oldUser);
   session.flush();
   System.out.println("Deleted successfully");
  }
  Criteria criteria = sessionFactory.openSession().createCriteria(User.class);
  return criteria.list();
 }

 public void setSessionFactory(SessionFactory sessionFactory) {
  this.sessionFactory = sessionFactory;
 }

}

Step 8: Create BeanConfig class. which will create EntityManagerFactory.

 package springboot;

import javax.persistence.EntityManagerFactory;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class BeanConfig {

 @Autowired
 private EntityManagerFactory entityManagerFactory;

 @Bean
 public SessionFactory getSessionFactory() {
     if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
         throw new NullPointerException("factory is not a hibernate factory");
     }
     return entityManagerFactory.unwrap(SessionFactory.class);
 }

 public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) {
  this.entityManagerFactory = entityManagerFactory;
 }

}

Step 9: Now we need to add code related to database details called application.properties

  # ===============================
# = DATA SOURCE
# ===============================

# Set here configurations for the database connection
spring.datasource.url = jdbc:mysql://localhost:3306/employee?useSSL=false

# Username and password
spring.datasource.username = root
spring.datasource.password = root

spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

Step 10: Create a RestController class. Name it as UserController

package springboot;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import springboot.model.User;
import springboot.service.UserService;

@Controller
public class UserController {
 
 @Autowired
 private UserService userService;
 
 @RequestMapping(value = "/list", method = RequestMethod.GET)
 public ResponseEntity userDetails() {
        
  List userDetails = userService.getUsers();
  return new ResponseEntity(userDetails, HttpStatus.OK);
 }
 
 @RequestMapping(value = "/create/{id}/{name}/{password}/{gender}/{country}/", method = RequestMethod.GET)
 public ResponseEntity createOrUpdateUserDetails(@PathVariable("id") long id, @PathVariable("name") String name,
   @PathVariable("password") String password,@PathVariable("gender") String gender,@PathVariable("country") String country) {
        User user = new User();
        user.setId(id);
        user.setName(name);
        user.setCountry(country);
        user.setGender(gender);
        user.setPassword(password);
  List userDetails = userService.createOrUpdateUser(user);
  return new ResponseEntity(userDetails, HttpStatus.OK);
 }
 @RequestMapping(value = "/delete/{id}", method = RequestMethod.GET)
 public ResponseEntity deleteUserDetails(@PathVariable("id") long id) {
        User user = new User();
        user.setId(id);
  List userDetails = userService.deleteUser(user);
  return new ResponseEntity(userDetails, HttpStatus.OK);
 }


 public void setUserService(UserService userService) {
  this.userService = userService;
 }

}

Step 11: Now we need to run this application through spring boot. So we have to write Application class.

  package springboot;

import java.util.Arrays;

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

@SpringBootApplication
public class Application {

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

    @Bean
    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
        return args -> {

            System.out.println("Let's inspect the beans provided by Spring Boot:");

            String[] beanNames = ctx.getBeanDefinitionNames();
            Arrays.sort(beanNames);
            for (String beanName : beanNames) {
                System.out.println(beanName);
            }

        };
    }

}

Step 12: Now we need to build and run this application.
Right click on the pom.xml file and Run As - clean install
Once that is done. Right click on the Application.java and Run As-> Java Application. Below details will be printed in Console

     .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.1.RELEASE)

2017-10-12 17:17:15.600  INFO 13036 --- [           main] springboot.Application                   : Starting Application on LAPTOP-2U8NKC7I with PID 13036 (F:\eclipse_workspace\spring_boot_first\target\classes started by Siva in F:\eclipse_workspace\spring_boot_first)
2017-10-12 17:17:15.626  INFO 13036 --- [           main] springboot.Application                   : No active profile set, falling back to default profiles: default
2017-10-12 17:17:16.033  INFO 13036 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@23bb8443: startup date [Thu Oct 12 17:17:15 IST 2017]; root of context hierarchy

   

Step 13: Use http://localhost:8080/list -- it will display all the records which is there inside user table.
If it askes username and password - then username will be - user and password will be check Using default security password: in console. that is your password.


Step 14: Use http://localhost:8080/create/16/sanju/sam/M/India/ - it will insert record inside DB and will display all the records from user table.

Step 15 : http://localhost:8080/delete/16 - it will delete where id is 16 and display all the results from user table.

Step 16 : Now we will learn how to create database and create a table.
Step 17: Install mysql and create database with name- employee. and create a table name called User with columns as mentioned below.

     CREATE TABLE user (
  id int(11) NOT NULL,
  name varchar(45) DEFAULT NULL,
  gender varchar(10) DEFAULT NULL,
  password varchar(45) DEFAULT NULL,
  country varchar(45) DEFAULT NULL,
  PRIMARY KEY (`id`)) 
     

Step 18: If you want to use another database. simply change the application.properties respective DB details and dialect along with respective connecter in pom.xml

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