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Complete Code Example

/frontend-spring-boot-react-crud-full-stack-with-maven/public/index.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
  <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
  <meta name="theme-color" content="#000000" />
  <!--
      manifest.json provides metadata used when your web app is installed on a
      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
    -->
  <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
  <!--
      Notice the use of %PUBLIC_URL% in the tags above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
  <title>My Full Stack Application with Spring Boot and React</title>
</head>

<body>
  <noscript>You need to enable JavaScript to run this app.</noscript>
  <div id="root"></div>
  <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start` or `yarn start`.
      To create a production bundle, use `npm run build` or `yarn build`.
    -->
</body>

</html>

/frontend-spring-boot-react-crud-full-stack-with-maven/public/manifest.json

{
  "short_name": "React App",
  "name": "Create React App Sample",
  "icons": [
    {
      "src": "favicon.ico",
      "sizes": "64x64 32x32 24x24 16x16",
      "type": "image/x-icon"
    }
  ],
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#000000",
  "background_color": "#ffffff"
}

/frontend-spring-boot-react-crud-full-stack-with-maven/src/App.css

@import url(https://unpkg.com/[email protected]/dist/css/bootstrap.min.css)

/frontend-spring-boot-react-crud-full-stack-with-maven/src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<App />, document.getElementById('root'));

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: https://bit.ly/CRA-PWA
serviceWorker.unregister();

/frontend-spring-boot-react-crud-full-stack-with-maven/src/component/ListCoursesComponent.jsx

import React, { Component } from 'react'
import CourseDataService from '../service/CourseDataService';

const INSTRUCTOR = 'in28minutes'

class ListCoursesComponent extends Component {
    constructor(props) {
        super(props)
        this.state = {
            courses: [],
            message: null
        }
        this.deleteCourseClicked = this.deleteCourseClicked.bind(this)
        this.updateCourseClicked = this.updateCourseClicked.bind(this)
        this.addCourseClicked = this.addCourseClicked.bind(this)
        this.refreshCourses = this.refreshCourses.bind(this)
    }

    componentDidMount() {
        this.refreshCourses();
    }

    refreshCourses() {
        CourseDataService.retrieveAllCourses(INSTRUCTOR)//HARDCODED
            .then(
                response => {
                    //console.log(response);
                    this.setState({ courses: response.data })
                }
            )
    }

    deleteCourseClicked(id) {
        CourseDataService.deleteCourse(INSTRUCTOR, id)
            .then(
                response => {
                    this.setState({ message: `Delete of course ${id} Successful` })
                    this.refreshCourses()
                }
            )

    }

    addCourseClicked() {
        this.props.history.push(`/courses/-1`)
    }

    updateCourseClicked(id) {
        console.log('update ' + id)
        this.props.history.push(`/courses/${id}`)
    }

    render() {
        console.log('render')
        return (
            <div className="container">
                <h3>All Courses</h3>
                {this.state.message && <div class="alert alert-success">{this.state.message}</div>}
                <div className="container">
                    <table className="table">
                        <thead>
                            <tr>
                                <th>Id</th>
                                <th>Description</th>
                                <th>Update</th>
                                <th>Delete</th>
                            </tr>
                        </thead>
                        <tbody>
                            {
                                this.state.courses.map(
                                    course =>
                                        <tr key={course.id}>
                                            <td>{course.id}</td>
                                            <td>{course.description}</td>
                                            <td><button className="btn btn-success" onClick={() => this.updateCourseClicked(course.id)}>Update</button></td>
                                            <td><button className="btn btn-warning" onClick={() => this.deleteCourseClicked(course.id)}>Delete</button></td>
                                        </tr>
                                )
                            }
                        </tbody>
                    </table>
                    <div className="row">
                        <button className="btn btn-success" onClick={this.addCourseClicked}>Add</button>
                    </div>
                </div>
            </div>
        )
    }
}

export default ListCoursesComponent

/frontend-spring-boot-react-crud-full-stack-with-maven/src/component/InstructorApp.jsx

import React, { Component } from 'react';
import ListCoursesComponent from './ListCoursesComponent';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom'
import CourseComponent from './CourseComponent';

class InstructorApp extends Component {
    render() {
        return (
            <Router>
                <>
                    <h1>Instructor Application</h1>
                    <Switch>
                        <Route path="/" exact component={ListCoursesComponent} />
                        <Route path="/courses" exact component={ListCoursesComponent} />
                        <Route path="/courses/:id" component={CourseComponent} />
                    </Switch>
                </>
            </Router>
        )
    }
}

export default InstructorApp

/frontend-spring-boot-react-crud-full-stack-with-maven/src/component/CourseComponent.jsx

import React, { Component } from 'react'
import { Formik, Form, Field, ErrorMessage } from 'formik';
import CourseDataService from '../service/CourseDataService';

const INSTRUCTOR = 'in28minutes'

class CourseComponent extends Component {
    constructor(props) {
        super(props)

        this.state = {
            id: this.props.match.params.id,
            description: ''
        }

        this.onSubmit = this.onSubmit.bind(this)
        this.validate = this.validate.bind(this)

    }

    componentDidMount() {

        console.log(this.state.id)

        // eslint-disable-next-line
        if (this.state.id == -1) {
            return
        }

        CourseDataService.retrieveCourse(INSTRUCTOR, this.state.id)
            .then(response => this.setState({
                description: response.data.description
            }))
    }

    validate(values) {
        let errors = {}
        if (!values.description) {
            errors.description = 'Enter a Description'
        } else if (values.description.length < 5) {
            errors.description = 'Enter atleast 5 Characters in Description'
        }

        return errors

    }

    onSubmit(values) {
        let username = INSTRUCTOR

        let course = {
            id: this.state.id,
            description: values.description,
            targetDate: values.targetDate
        }

        if (this.state.id === -1) {
            CourseDataService.createCourse(username, course)
                .then(() => this.props.history.push('/courses'))
        } else {
            CourseDataService.updateCourse(username, this.state.id, course)
                .then(() => this.props.history.push('/courses'))
        }

        console.log(values);
    }

    render() {

        let { description, id } = this.state

        return (
            <div>
                <h3>Course</h3>
                <div className="container">
                    <Formik
                        initialValues={{ id, description }}
                        onSubmit={this.onSubmit}
                        validateOnChange={false}
                        validateOnBlur={false}
                        validate={this.validate}
                        enableReinitialize={true}
                    >
                        {
                            (props) => (
                                <Form>
                                    <ErrorMessage name="description" component="div"
                                        className="alert alert-warning" />
                                    <fieldset className="form-group">
                                        <label>Id</label>
                                        <Field className="form-control" type="text" name="id" disabled />
                                    </fieldset>
                                    <fieldset className="form-group">
                                        <label>Description</label>
                                        <Field className="form-control" type="text" name="description" />
                                    </fieldset>
                                    <button className="btn btn-success" type="submit">Save</button>
                                </Form>
                            )
                        }
                    </Formik>

                </div>
            </div>
        )
    }
}

export default CourseComponent

/frontend-spring-boot-react-crud-full-stack-with-maven/src/index.css

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
    monospace;
}

/frontend-spring-boot-react-crud-full-stack-with-maven/src/App.test.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

it('renders without crashing', () => {
  const div = document.createElement('div');
  ReactDOM.render(<App />, div);
  ReactDOM.unmountComponentAtNode(div);
});

/frontend-spring-boot-react-crud-full-stack-with-maven/src/serviceWorker.js

// This optional code is used to register a service worker.
// register() is not called by default.

// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on subsequent visits to a page, after all the
// existing tabs open on the page have been closed, since previously cached
// resources are updated in the background.

// To learn more about the benefits of this model and instructions on how to
// opt-in, read https://bit.ly/CRA-PWA

const isLocalhost = Boolean(
  window.location.hostname === 'localhost' ||
    // [::1] is the IPv6 localhost address.
    window.location.hostname === '[::1]' ||
    // 127.0.0.1/8 is considered localhost for IPv4.
    window.location.hostname.match(
      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
    )
);

export function register(config) {
  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
    // The URL constructor is available in all browsers that support SW.
    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
    if (publicUrl.origin !== window.location.origin) {
      // Our service worker won't work if PUBLIC_URL is on a different origin
      // from what our page is served on. This might happen if a CDN is used to
      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
      return;
    }

    window.addEventListener('load', () => {
      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;

      if (isLocalhost) {
        // This is running on localhost. Let's check if a service worker still exists or not.
        checkValidServiceWorker(swUrl, config);

        // Add some additional logging to localhost, pointing developers to the
        // service worker/PWA documentation.
        navigator.serviceWorker.ready.then(() => {
          console.log(
            'This web app is being served cache-first by a service ' +
              'worker. To learn more, visit https://bit.ly/CRA-PWA'
          );
        });
      } else {
        // Is not localhost. Just register service worker
        registerValidSW(swUrl, config);
      }
    });
  }
}

function registerValidSW(swUrl, config) {
  navigator.serviceWorker
    .register(swUrl)
    .then(registration => {
      registration.onupdatefound = () => {
        const installingWorker = registration.installing;
        if (installingWorker == null) {
          return;
        }
        installingWorker.onstatechange = () => {
          if (installingWorker.state === 'installed') {
            if (navigator.serviceWorker.controller) {
              // At this point, the updated precached content has been fetched,
              // but the previous service worker will still serve the older
              // content until all client tabs are closed.
              console.log(
                'New content is available and will be used when all ' +
                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
              );

              // Execute callback
              if (config && config.onUpdate) {
                config.onUpdate(registration);
              }
            } else {
              // At this point, everything has been precached.
              // It's the perfect time to display a
              // "Content is cached for offline use." message.
              console.log('Content is cached for offline use.');

              // Execute callback
              if (config && config.onSuccess) {
                config.onSuccess(registration);
              }
            }
          }
        };
      };
    })
    .catch(error => {
      console.error('Error during service worker registration:', error);
    });
}

function checkValidServiceWorker(swUrl, config) {
  // Check if the service worker can be found. If it can't reload the page.
  fetch(swUrl)
    .then(response => {
      // Ensure service worker exists, and that we really are getting a JS file.
      const contentType = response.headers.get('content-type');
      if (
        response.status === 404 ||
        (contentType != null && contentType.indexOf('javascript') === -1)
      ) {
        // No service worker found. Probably a different app. Reload the page.
        navigator.serviceWorker.ready.then(registration => {
          registration.unregister().then(() => {
            window.location.reload();
          });
        });
      } else {
        // Service worker found. Proceed as normal.
        registerValidSW(swUrl, config);
      }
    })
    .catch(() => {
      console.log(
        'No internet connection found. App is running in offline mode.'
      );
    });
}

export function unregister() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.ready.then(registration => {
      registration.unregister();
    });
  }
}

/frontend-spring-boot-react-crud-full-stack-with-maven/src/service/CourseDataService.js

import axios from 'axios'

const INSTRUCTOR = 'in28minutes'
const COURSE_API_URL = 'http://localhost:8080'
const INSTRUCTOR_API_URL = `${COURSE_API_URL}/instructors/${INSTRUCTOR}`

class CourseDataService {

    retrieveAllCourses(name) {
        //console.log('executed service')
        return axios.get(`${INSTRUCTOR_API_URL}/courses`);
    }

    retrieveCourse(name, id) {
        //console.log('executed service')
        return axios.get(`${INSTRUCTOR_API_URL}/courses/${id}`);
    }

    deleteCourse(name, id) {
        //console.log('executed service')
        return axios.delete(`${INSTRUCTOR_API_URL}/courses/${id}`);
    }

    updateCourse(name, id, course) {
        //console.log('executed service')
        return axios.put(`${INSTRUCTOR_API_URL}/courses/${id}`, course);
    }

    createCourse(name, course) {
        //console.log('executed service')
        return axios.post(`${INSTRUCTOR_API_URL}/courses/`, course);
    }
}

export default new CourseDataService()

/frontend-spring-boot-react-crud-full-stack-with-maven/src/logo.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
    <g fill="#61DAFB">
        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
        <circle cx="420.9" cy="296.5" r="45.7"/>
        <path d="M520.5 78.1z"/>
    </g>
</svg>

/frontend-spring-boot-react-crud-full-stack-with-maven/src/App.js

import React, { Component } from 'react';
import './App.css';
import InstructorApp from './component/InstructorApp';

class App extends Component {
  render() {
    return (
      <div className="container">
        <InstructorApp />
      </div>
    );
  }
}

export default App;

/frontend-spring-boot-react-crud-full-stack-with-maven/package.json

{
  "name": "spring-boot-react-crud-full-stack-with-maven",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.18.0",
    "formik": "^1.5.1",
    "react": "^16.8.5",
    "react-dom": "^16.8.5",
    "react-router-dom": "^5.0.0",
    "react-scripts": "2.1.8"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ]
}

/backend-spring-boot-react-crud-full-stack-with-maven/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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.3.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.in28minutes.fullstack.springboot.maven.crud</groupId>
	<artifactId>spring-boot-fullstack-crud-full-stack-with-maven</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>spring-boot-fullstack-crud-full-stack-with-maven</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

/backend-spring-boot-react-crud-full-stack-with-maven/src/test/java/com/in28minutes/fullstack/springboot/react/maven/crud/springbootreactcrudfullstackwithmaven/SpringBootReactCrudFullStackWithMavenApplicationTests.java

package com.in28minutes.fullstack.springboot.react.maven.crud.springbootreactcrudfullstackwithmaven;

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 SpringBootReactCrudFullStackWithMavenApplicationTests {

	@Test
	public void contextLoads() {
	}

}

/backend-spring-boot-react-crud-full-stack-with-maven/src/main/resources/application.properties





/backend-spring-boot-react-crud-full-stack-with-maven/src/main/java/com/in28minutes/fullstack/springboot/maven/crud/springbootcrudfullstackwithmaven/SpringBootFullStackCrudFullStackWithMavenApplication.java


package com.in28minutes.fullstack.springboot.maven.crud.springbootcrudfullstackwithmaven;

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

@SpringBootApplication
public class SpringBootFullStackCrudFullStackWithMavenApplication {

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

}




/backend-spring-boot-react-crud-full-stack-with-maven/src/main/java/com/in28minutes/fullstack/springboot/maven/crud/springbootcrudfullstackwithmaven/course/CoursesHardcodedService.java


package com.in28minutes.fullstack.springboot.maven.crud.springbootcrudfullstackwithmaven.course;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Service;

@Service
public class CoursesHardcodedService {

	private static List<Course> courses = new ArrayList<>();
	private static long idCounter = 0;

	static {
		courses.add(new Course(++idCounter, "in28minutes", "Learn Full stack with Spring Boot and Angular"));
		courses.add(new Course(++idCounter, "in28minutes", "Learn Full stack with Spring Boot and React"));
		courses.add(new Course(++idCounter, "in28minutes", "Master Microservices with Spring Boot and Spring Cloud"));
		courses.add(new Course(++idCounter, "in28minutes",
				"Deploy Spring Boot Microservices to Cloud with Docker and Kubernetes"));
	}

	public List<Course> findAll() {
		return courses;
	}

	public Course save(Course course) {
		if (course.getId() == -1 || course.getId() == 0) {
			course.setId(++idCounter);
			courses.add(course);
		} else {
			deleteById(course.getId());
			courses.add(course);
		}
		return course;
	}

	public Course deleteById(long id) {
		Course course = findById(id);

		if (course == null)
			return null;

		if (courses.remove(course)) {
			return course;
		}

		return null;
	}

	public Course findById(long id) {
		for (Course course : courses) {
			if (course.getId() == id) {
				return course;
			}
		}

		return null;
	}
}




/backend-spring-boot-react-crud-full-stack-with-maven/src/main/java/com/in28minutes/fullstack/springboot/maven/crud/springbootcrudfullstackwithmaven/course/Course.java


package com.in28minutes.fullstack.springboot.maven.crud.springbootcrudfullstackwithmaven.course;

public class Course {
	private Long id;
	private String username;
	private String description;

	public Course() {

	}

	public Course(long id, String username, String description) {
		super();
		this.id = id;
		this.username = username;
		this.description = description;
	}

	public Long getId() {
		return id;
	}

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

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((description == null) ? 0 : description.hashCode());
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result + ((username == null) ? 0 : username.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Course other = (Course) obj;
		if (description == null) {
			if (other.description != null)
				return false;
		} else if (!description.equals(other.description))
			return false;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		if (username == null) {
			if (other.username != null)
				return false;
		} else if (!username.equals(other.username))
			return false;
		return true;
	}

}




/backend-spring-boot-react-crud-full-stack-with-maven/src/main/java/com/in28minutes/fullstack/springboot/maven/crud/springbootcrudfullstackwithmaven/course/CourseResource.java


package com.in28minutes.fullstack.springboot.maven.crud.springbootcrudfullstackwithmaven.course;

import java.net.URI;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
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.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

@CrossOrigin(origins = { "http://localhost:3000", "http://localhost:4200" })
@RestController
public class CourseResource {

	@Autowired
	private CoursesHardcodedService courseManagementService;

	@GetMapping("/instructors/{username}/courses")
	public List<Course> getAllCourses(@PathVariable String username) {
		return courseManagementService.findAll();
	}

	@GetMapping("/instructors/{username}/courses/{id}")
	public Course getCourse(@PathVariable String username, @PathVariable long id) {
		return courseManagementService.findById(id);
	}

	@DeleteMapping("/instructors/{username}/courses/{id}")
	public ResponseEntity<Void> deleteCourse(@PathVariable String username, @PathVariable long id) {

		Course course = courseManagementService.deleteById(id);

		if (course != null) {
			return ResponseEntity.noContent().build();
		}

		return ResponseEntity.notFound().build();
	}

	@PutMapping("/instructors/{username}/courses/{id}")
	public ResponseEntity<Course> updateCourse(@PathVariable String username, @PathVariable long id,
			@RequestBody Course course) {

		Course courseUpdated = courseManagementService.save(course);

		return new ResponseEntity<Course>(course, HttpStatus.OK);
	}

	@PostMapping("/instructors/{username}/courses")
	public ResponseEntity<Void> createCourse(@PathVariable String username, @RequestBody Course course) {

		Course createdCourse = courseManagementService.save(course);

		// Location
		// Get current resource url
		/// {id}
		URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(createdCourse.getId())
				.toUri();

		return ResponseEntity.created(uri).build();
	}

}