Spring Boot + React JS + MySQL Project CRUD Example

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In this tutorial, we will build a simple CRUD application using React as the frontend and Spring Boot as the backend. We will use the MySQL database to store and retrieve the data.

In this tutorial, we are going to use the latest version of React 18+ and Spring Boot version 3+.

Spring Boot CRUD REST APIs - Backend Implementation

Let's first build the backend CRUD REST APIs using Spring Boot and MySQL database.

Add Maven Dependencies

Create a Spring boot project and add the following maven dependencies:
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>com.mysql</groupId>
			<artifactId>mysql-connector-j</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

Configure MySQL Database

Open the application.properties file and add the below MySQL database configuration details:
spring.datasource.url=jdbc:mysql://localhost:3306/ems?useSSL=false
spring.datasource.username=root
spring.datasource.password=Mysql@123

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect

spring.jpa.hibernate.ddl-auto = update
Make sure to change the database username and password as per your MySQL server installation in your machine.

Create JPA Entity

Let's create an Employee JPA entity and add the following code to it:
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

import jakarta.persistence.*;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "employees")
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

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

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email_id")
    private String email;
}
Note that we are using Lombok annotations to reduce the boilerplate code.

Create Spring Data JPA Repository

Let's create an EmployeeRepository interface that extends the JpaRepository interface and add the following content to it:
import net.javaguides.springboot.model.Employee;
import org.springframework.data.jpa.repository.JpaRepository;

public interface EmployeeRepository extends JpaRepository<Employee, Long> {
    // all crud database methods
}
Once our EmployeeRepository interface extends the JpaRepository interface then Spring Data JPA offers CRUD methods to perform CRUD database operations for the Employee entity.

Create EmployeeDto and EmployeeMapper Classes

Let's create the DTO(Data Transfer Object pattern) EmployeeDto class to transfer the data between the client and server.

EmployeeDto

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class EmployeeDto {
    private long id;
    private String firstName;
    private String lastName;
    private String email;
}

EmployeeMapper Class

Next, let's create an EmployeeMapper class to convert the Employee entity to EmployeeDto and vice versa:
import net.javaguides.ems.dto.EmployeeDto;
import net.javaguides.ems.entity.Employee;

public class EmployeeMapper {

    public static EmployeeDto mapToEmployeeDto(Employee employee){
        return new EmployeeDto(
                employee.getId(),
                employee.getFirstName(),
                employee.getLastName(),
                employee.getEmail()
        );
    }

    public static Employee mapToEmployee(EmployeeDto employeeDto){
        return new Employee(
                employeeDto.getId(),
                employeeDto.getFirstName(),
                employeeDto.getLastName(),
                employeeDto.getEmail()
        );
    }
}

Service Layer

EmployeeService Interface

Next, let's create an EmployeeService interface and add the following CRUD methods:
import net.javaguides.springboot.dto.EmployeeDto;

import java.util.List;

public interface EmployeeService {
    List<EmployeeDto> getAllEmployees();

    EmployeeDto createEmployee(EmployeeDto employee);

    EmployeeDto getEmployeeById(Long employeeId);

    EmployeeDto updateEmployee(Long employeeId, EmployeeDto employeeDto);

    void deleteEmployee(Long employeeId);
}

EmployeeServiceImpl Class

Let's create EmployeeServiceImpl class that implements the EmployeeService interface and it's CRUD methods:
import lombok.AllArgsConstructor;
import net.javaguides.springboot.dto.EmployeeDto;
import net.javaguides.springboot.exception.ResourceNotFoundException;
import net.javaguides.springboot.mapper.EmployeeMapper;
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.repository.EmployeeRepository;
import net.javaguides.springboot.service.EmployeeService;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.stream.Collectors;

@Service
@AllArgsConstructor
public class EmployeeServiceImpl implements EmployeeService {

    private EmployeeRepository employeeRepository;

    @Override
    public List<EmployeeDto> getAllEmployees() {
        List<Employee> employees = employeeRepository.findAll();
        List<EmployeeDto> employeeDtos = employees.stream()
                .map((employee) -> EmployeeMapper.mapToEmployeeDto(employee))
                .collect(Collectors.toList());
        return employeeDtos;
    }

    @Override
    public EmployeeDto createEmployee(EmployeeDto employeeDto) {
        Employee employee = EmployeeMapper.mapToEmployee(employeeDto);
        Employee savedEmployee = employeeRepository.save(employee);
        return EmployeeMapper.mapToEmployeeDto(savedEmployee);
    }

    @Override
    public EmployeeDto getEmployeeById(Long employeeId) {
        Employee employee = employeeRepository.findById(employeeId)
                .orElseThrow(() ->
                        new ResourceNotFoundException("Employee not exist with id: " + employeeId));
        EmployeeDto employeeDto = EmployeeMapper.mapToEmployeeDto(employee);
        return employeeDto;
    }

    @Override
    public EmployeeDto updateEmployee(Long employeeId, EmployeeDto employeeDto) {

        Employee existingEmployee = employeeRepository.findById(employeeId)
                .orElseThrow(() ->
                        new ResourceNotFoundException("Employee not exist with id: " + employeeId));

        existingEmployee.setFirstName(employeeDto.getFirstName());
        existingEmployee.setLastName(employeeDto.getLastName());
        existingEmployee.setEmail(employeeDto.getEmail());

        employeeRepository.save(existingEmployee);
        return EmployeeMapper.mapToEmployeeDto(existingEmployee);
    }

    @Override
    public void deleteEmployee(Long employeeId) {

        Employee existingEmployee = employeeRepository.findById(employeeId)
                .orElseThrow(() ->
                        new ResourceNotFoundException("Employee not exist with id: " + employeeId));

        employeeRepository.deleteById(employeeId);
    }
}

Controller Layer

Before creating the controller layer, let's first create one custom exception named ResourceNotFoundException:
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND)
public class ResourceNotFoundException extends RuntimeException{

    public ResourceNotFoundException(String message){
        super(message);
    }
}
Let's create EmployeeController class and build the CRUD REST APIs for the Employee resource:
import lombok.AllArgsConstructor;
import net.javaguides.springboot.dto.EmployeeDto;
import net.javaguides.springboot.exception.ResourceNotFoundException;
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.repository.EmployeeRepository;
import net.javaguides.springboot.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@CrossOrigin("*")
@AllArgsConstructor
@RestController
@RequestMapping("/api/v1/employees")
public class EmployeeController {

    private EmployeeService employeeService;

    @GetMapping
    public ResponseEntity<List<EmployeeDto>> getAllEmployees(){
        List<EmployeeDto> employees = employeeService.getAllEmployees();
        return ResponseEntity.ok(employees);
    }

    // build create employee REST API
    @PostMapping
    public ResponseEntity<EmployeeDto> createEmployee(@RequestBody EmployeeDto employee) {
        EmployeeDto employeeDto = employeeService.createEmployee(employee);
        return new ResponseEntity<>(employeeDto, HttpStatus.CREATED);
    }

    // build get employee by id REST API
    @GetMapping("{id}")
    public ResponseEntity<EmployeeDto> getEmployeeById(@PathVariable("id") Long employeeId){
        EmployeeDto employee = employeeService.getEmployeeById(employeeId);
        return ResponseEntity.ok(employee);
    }

    // build update employee REST API
    @PutMapping("{id}")
    public ResponseEntity<EmployeeDto> updateEmployee(@PathVariable("id") Long employeeId,
                                                   @RequestBody EmployeeDto employeeDetails) {
        EmployeeDto updateEmployee = employeeService.updateEmployee(employeeId, employeeDetails);
        return ResponseEntity.ok(updateEmployee);
    }

    // build delete employee REST API
    @DeleteMapping("{id}")
    public ResponseEntity<String> deleteEmployee(@PathVariable("id") Long employeeId){
        employeeService.deleteEmployee(employeeId);
        return ResponseEntity.ok("Employee deleted successfully!");
    }
}

React JS CRUD Application - Frontend Implementation

Let's first build the React JS frontend application and consume CRUD REST APIs that were exposed by the Spring Boot application.

Create a React UI with Create React App

Use the following command to create a react application using the create-react-app tool:
npx create-react-app ems-frontend

Open React application is created. Next, let's understand important folders and files.

package.json - The package.json file contains all the required dependencies for our React JS project. Most importantly, you can check the current version of React that you are using. It has all the scripts to start, build, and eject our React app.

public folder - The public folder contains index.html. As React is used to build a single-page application, we have this single HTML file to render all our components. Basically, it's an HTML template. It has a div element with id as root and all our components are rendered in this div with index.html as a single page for the complete react app.

src folder- In this folder, we have all the global javascript and CSS files. All the different components that we will be building, sit here.

index.js - This is the top renderer of your React app.

node_modules - All the packages installed by NPM or Yarn will reside inside the node_modules folder.

App.js - The App.js file contains the definition of our App component which actually gets rendered in the browser and this is the root component.

package.json

This file contains all the required dependencies for our React JS project. Most importantly, you can check the current version of React that you are using. It has all the scripts to start, build, and eject our React app:
{
  "name": "react-todo",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.5",
    "@testing-library/react": "^13.4.0",
    "@testing-library/user-event": "^13.5.0",
    "axios": "^1.3.6",
    "bootstrap": "^5.2.3",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-router-dom": "^6.10.0",
    "react-scripts": "5.0.1",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

Adding Bootstrap in React Using NPM

Open a new terminal window, navigate to your project's folder, and run the following command:

$ npm install bootstrap --save

--save option add an entry in the package.json file

Open the src/index.js file and add the following code:

import 'bootstrap/dist/css/bootstrap.min.css';

Complete code index.js:

import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';
import 'bootstrap/dist/css/bootstrap.min.css';

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals();

EmployeeService - Consume CRUD REST APIs

In order to make REST API calls in our React application, we are going to use the Axios HTTP library.

Let's install Axios using below NPM command:
npm add axios --save
Next, let's create an EmployeeService.js file and add the following code to it:
import axios from 'axios'

const EMPLOYEE_BASE_REST_API_URL = 'http://localhost:8080/api/v1/employees';

export const listEmployees = () => {
    return axios.get(EMPLOYEE_BASE_REST_API_URL)
};

export const createEmployee = (employee) => {
    return axios.post(EMPLOYEE_BASE_REST_API_URL, employee)
}

export const getEmployeeById = (employeeId) => {
    return axios.get(EMPLOYEE_BASE_REST_API_URL + '/' + employeeId);
}

export const updateEmployee = (employeeId, employee) => {
    return axios.put(EMPLOYEE_BASE_REST_API_URL + '/' +employeeId, employee);
}

export const deleteEmployee = (employeeId) => {
    return axios.delete(EMPLOYEE_BASE_REST_API_URL + '/' + employeeId);
}

React List Employee Component

In this section, we will create a new folder called components inside the src folder. Then create a new file called ListEmployeeComponent,js. 

Within this file create a React class component named ListEmployeeComponent with the following content:
import React, {useState, useEffect} from 'react'
import {listEmployees} from '../services/EmployeeService'

const ListEmployeeComponent = () => {

    const [employees, setEmployees] = useState([])


    useEffect(() => {
        getAllEmployees();
    }, [])

    const getAllEmployees = () => {
        listEmployees().then((response) => {
            setEmployees(response.data)
            console.log(response.data);
        }).catch(error =>{
            console.log(error);
        })
    }

    return (
        <div className = "container">
            <h2 className = "text-center"> List Employees </h2>
            <table className="table table-bordered table-striped">
                <thead>
                    <th> Employee Id </th>
                    <th> Employee First Name </th>
                    <th> Employee Last Name </th>
                    <th> Employee Email Id </th>
                </thead>
                <tbody>
                    {
                        employees.map(
                            employee =>
                            <tr key = {employee.id}> 
                                <td> {employee.id} </td>
                                <td> {employee.firstName} </td>
                                <td>{employee.lastName}</td>
                                <td>{employee.email}</td>
                            </tr>
                        )
                    }
                </tbody>
            </table>
        </div>
    )
}

export default ListEmployeeComponent
The useState is a Hook (function) that allows you to define state variables in functional components. You pass the initial state to this function and it returns a variable with the current state value (not necessarily the initial state) and another function to update this value.

The useEffect Hook allows us to perform side effects (an action) in the function components. It does not use component lifecycle methods that are available in class components. Side effects have common features which most web applications need to perform, such as: 
  • Updating the DOM,
  • Fetching and consuming data from a server API,
  • Setting up a subscription, etc.
We are using the ES6 feature which is a map() method to loop over our employees list and create the view:
                <tbody>
                    {
                        employees.map(
                            employee =>
                            <tr key = {employee.id}> 
                                <td> {employee.id} </td>
                                <td> {employee.firstName} </td>
                                <td>{employee.lastName}</td>
                                <td>{employee.email}</td>
                            </tr>
                        )
                    }
                </tbody>

HeaderComponent and FooterComponent

Let's create a new file named HeaderComponent.js and within this file, create a component named HeaderComponent with the following code:

import React from 'react'

const HeaderComponent = () => {
    return (
        <div>
            <header>
                <nav className = "navbar navbar-expand-md navbar-dark bg-dark">
                    <div>
                        <a href = "https://javaguides.net" className = "navbar-brand">
                            Employee Management Application
                        </a>
                    </div>

                </nav>
            </header>
        </div>
    )
}

export default HeaderComponent
Let's create a new file named FooterComponent.js and within this file, create a component named FooterComponent with the following code:
import React from 'react'

const FooterComponent = () => {
    return (
        <div>
            <footer className = "footer">
                 <span className="text-muted">All Rights Reserved 2021 @JavaGuides</span>
            </footer>
        </div>
    )
}

export default FooterComponent
Add below CSS code to App.css File:
.footer {
  position: absolute;
  bottom: 0;
  width:100%;
  height: 50px;
  background-color: black;
  text-align: center;
  color: white;
}

Update App.js to use FooterComponent and Test

import './App.css';
import FooterComponent from './components/FooterComponent';
import  HeaderComponent  from './components/HeaderComponent';
import ListEmployeeComponent from './components/ListEmployeeComponent';

function App() {
  return (
    <div>
      <HeaderComponent />
      <ListEmployeeComponent />
      <FooterComponent />
   </div>
  );
}

export default App;

Configure Routing in React App

To use React Router, you first have to install it using NPM:

npm install react-router-dom --save
Check the entry in the package.json file for React Router.


Next, let's configure Routing in the App Component:

import './App.css';
import {BrowserRouter, Routes, Route } from 'react-router-dom';
import FooterComponent from './components/FooterComponent';
import HeaderComponent from './components/HeaderComponent';
import ListEmployeeComponent from './components/ListEmployeeComponent';

function App() {
  return (
    <div>
      <BrowserRouter>
        <HeaderComponent />
        <div className= "container">
          <Routes>
              <Route path = "/" element = { <ListEmployeeComponent /> }></Route>
              <Route path = "/employees" element = { <ListEmployeeComponent /> }></Route>
            </Routes>
        </div>
        <FooterComponent />
        </BrowserRouter>
    </div>
  );
}

export default App;

Add and Update Employee Component

In this section, we will implement Add Employee and update employee functionality. We will use the same React Component to perform both add and update employee operations.
Let's create a new file called EmployeeComponent.js. Within this file create a React class component named EmployeeComponent with the following content:
import React, {useState, useEffect} from 'react'
import {useNavigate, useParams } from 'react-router-dom';
import { updateEmployee, createEmployee, getEmployeeById} from '../services/EmployeeService';

const EmployeeComponent = () => {

    const [firstName, setFirstName] = useState('')
    const [lastName, setLastName] = useState('')
    const [email, setEmail] = useState('')

    const navigate = useNavigate();
    const {id} = useParams();

    const saveOrUpdateEmployee = (e) => {
        e.preventDefault();

        const employee = {firstName, lastName, email, departmentId}

        console.log(employee);
        if(id){
            updateEmployee(id, employee).then((response) => {
                navigate('/employees')
            }).catch(error => {
                console.log(error)
            })

        }else{
            createEmployee(employee).then((response) =>{

                console.log(response.data)
    
                navigate('/employees');
    
            }).catch(error => {
                console.log(error)
            })
        }
        
    }

    useEffect(() => {

        if(id){
            getEmployeeById(id).then((response) =>{
                setFirstName(response.data.firstName)
                setLastName(response.data.lastName)
                setEmail(response.data.email)
            }).catch(error => {
                console.log(error)
            })
        }

    }, [id])

    const pageTitle = () => {

        if(id){
            return <h2 className = "text-center">Update Employee</h2>
        }else{
            return <h2 className = "text-center">Add Employee</h2>
        }
    }

    return (
        <div>
           <br /><br />
           <div className = "container">
                <div className = "row">
                    <div className = "card col-md-6 offset-md-3 offset-md-3">
                       {
                           pageTitle()
                       }
                        <div className = "card-body">
                            <form>
                                <div className = "form-group mb-2">
                                    <label className = "form-label"> First Name :</label>
                                    <input
                                        type = "text"
                                        placeholder = "Enter first name"
                                        name = "firstName"
                                        className = "form-control"
                                        value = {firstName}
                                        onChange = {(e) => setFirstName(e.target.value)}
                                    >
                                    </input>
                                </div>

                                <div className = "form-group mb-2">
                                    <label className = "form-label"> Last Name :</label>
                                    <input
                                        type = "text"
                                        placeholder = "Enter last name"
                                        name = "lastName"
                                        className = "form-control"
                                        value = {lastName}
                                        onChange = {(e) => setLastName(e.target.value)}
                                    >
                                    </input>
                                </div>

                                <div className = "form-group mb-2">
                                    <label className = "form-label"> Email Id :</label>
                                    <input
                                        type = "email"
                                        placeholder = "Enter email Id"
                                        name = "email"
                                        className = "form-control"
                                        value = {email}
                                        onChange = {(e) => setEmail(e.target.value)}
                                    >
                                    </input>
                                </div>

                                <button className = "btn btn-success" onClick = {(e) => saveOrUpdateEmployee(e)} >Submit </button>
                                {/* <Link to="/employees" className="btn btn-danger"> Cancel </Link> */}
                            </form>

                        </div>
                    </div>
                </div>

           </div>

        </div>
    )
}

export default EmployeeComponent
Let's understand the above code.

We used useState() hook to create state variables in our functional components:

    const [firstName, setFirstName] = useState('')
    const [lastName, setLastName] = useState('')
    const [email, setEmail] = useState('')
We retrieved the employee id from the route using the following line of code:
    const {id} = useParams();
We created JavaScript Function to handle the onClick Event (Form submit):
    const saveOrUpdateEmployee = (e) => {
        e.preventDefault();

        const employee = {firstName, lastName, email, departmentId}

        console.log(employee);
        if(id){
            updateEmployee(id, employee).then((response) => {
                navigate('/employees')
            }).catch(error => {
                console.log(error)
            })

        }else{
            createEmployee(employee).then((response) =>{

                console.log(response.data)
    
                navigate('/employees');
    
            }).catch(error => {
                console.log(error)
            })
        }
        
    }
Navigated to list employees page import useNavigate() hook from react-router-dom library:
  const navigate  = useNavigate();

Navigate to /employees page:

       navigate('/employees')

Update The Routing for EmployeeComponent

import './App.css';
import {BrowserRouter, Routes, Route } from 'react-router-dom';
import FooterComponent from './components/FooterComponent';
import HeaderComponent from './components/HeaderComponent';
import ListEmployeeComponent from './components/ListEmployeeComponent';
import EmployeeComponent from './components/EmployeeComponent';

function App() {
  return (
    <div>
      <BrowserRouter>
        <HeaderComponent />
        <div className= "container">
          <Routes>
              <Route path = "/" element = { <ListEmployeeComponent /> }></Route>
              <Route path = "/employees" element = { <ListEmployeeComponent /> }></Route>
              <Route path = "/add-employee" element = { <EmployeeComponent />} ></Route>
              <Route path = "/edit-employee/:id" element = { <EmployeeComponent />}></Route>
            </Routes>
        </div>
        <FooterComponent />
        </BrowserRouter>
    </div>
  );
}

export default App;

Delete Employee Feature - Frontend

  1. Add delete button to list employees table:
 <button className = "btn btn-danger" onClick = {() => removeEmployee(employee.id)}
                                    style = {{marginLeft:"10px"}}> Delete</button>
  1. Next, create removeEmployee function and print the id:
    const removeEmployee = (employeeId) => {
        console.log(id);    
    }
  1. Next, let's write the code to make delete employee REST API using Axios:
export const deleteEmployee = (employeeId) => {
    return axios.delete(EMPLOYEE_BASE_REST_API_URL + '/' + employeeId);
}
  1. Change removeEmployee to call deleteEmployee method:
    const removeEmployee = (employeeId) => {
       deleteEmployee(employeeId).then((response) =>{
        getAllEmployees();

       }).catch(error =>{
           console.log(error);
       })
    }
Complete code for ListEmployeeComponrnt with above changes:
import React, {useState, useEffect} from 'react'
import { useNavigate } from 'react-router-dom'
import {listEmployees, deleteEmployee} from '../services/EmployeeService'

const ListEmployeeComponent = () => {

    const [employees, setEmployees] = useState([])

    const navigate = useNavigate()

    useEffect(() => {
        getAllEmployees();
    }, [])

    const getAllEmployees = () => {
        listEmployees().then((response) => {
            setEmployees(response.data)
            console.log(response.data);
        }).catch(error =>{
            console.log(error);
        })
    }

    const removeEmployee = (employeeId) => {
       deleteEmployee(employeeId).then((response) =>{
        getAllEmployees();

       }).catch(error =>{
           console.log(error);
       })
        
    }

    function addNewEmployee() {
        navigate('/add-employee')
    }

    const updateEmployee = (id) => {
        navigate(`/edit-employee/${id}`)
    }

    return (
        <div className = "container">
            <br /><br />
            <h2 className = "text-center"> List Employees </h2>
            {/* <Link to = "/add-employee" className = "btn btn-primary mb-2" > Add Employee </Link> */}
            <button className = "btn btn-primary mb-2" onClick={addNewEmployee }>Add Employee</button>
            <table className="table table-bordered table-striped">
                {/* <thead className="table-dark"> */}
                <thead>   
                    <tr>
                        <th> Employee Id </th>
                        <th> Employee First Name </th>
                        <th> Employee Last Name </th>
                        <th> Employee Email Id </th>
                        <th> Department Name</th>
                        <th> Actions </th>
                    </tr>
                </thead>
                <tbody>
                    {
                        employees.map(
                            employee =>
                            <tr key = {employee.id}> 
                                <td> {employee.id} </td>
                                <td> {employee.firstName} </td>
                                <td>{employee.lastName}</td>
                                <td>{employee.email}</td>
                                <td> {employee.departmentDto.departmentName}</td>
                                <td>
                                    <button className="btn btn-info" onClick={() => updateEmployee(employee.id)} >Update</button>
                                    <button className = "btn btn-danger" onClick = {() => removeEmployee(employee.id)}
                                    style = {{marginLeft:"10px"}}> Delete</button>
                                </td>
                            </tr>
                        )
                    }
                </tbody>
            </table>
        </div>
    )
}

export default ListEmployeeComponent

Run React App

Before running React App, make sure that your Spring boot project is up and running.

Use the below command to start the project:
npm start
Once, react app is up and running. Next, hit this link in the browser: http://localhost:3000/employees
Click on Add Employee button will navigate to Add Employee page:
Click on the Update button will navigate to the Update Employee page:

Conclusion

In this tutorial, we built a simple CRUD application using React as the front end and Spring Boot as the back end. We used the MySQL database to store and retrieve the data.

Related Spring and Spring Boot Tutorials/Guides:

Spring Boot Tutorials [500+] Spring Boot Testing Tutorial Spring Boot Microservice Tutorial Spring Boot Kafka Microservices Spring Boot + Apache Kafka Tutorial Spring Core Tutorial Spring MVC Tutorial Spring Data JPA Tutorial Spring Framework for Beginners Spring AOP Tutorial Spring Security Tutorial Spring Exceptions Tutorial Spring Boot Interview Questions Spring Boot Microservices Interview Questions Apache Kafka Tutorials Docker Tutorials and Guides Spring Boot RabbitMQ Tutorials Angular CRUD Example with Spring Boot Spring Boot + Angular 12 CRUD Full Stack Spring Boot + Angular 8 CRUD Full Stack Spring Boot + Angular 10 CRUD Full Stack Spring Boot + React JS CRUD Full Stack React JS ( React Hooks) + Spring Boot Spring Boot Thymeleaf CRUD Full Stack Spring Boot User Registration and Login Node Js + Express + MongoDB CRUD Vue JS + Spring Boot REST API Tutorial

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