To do:

• On the product list, add a button - Buy. When user clicks on this button - he needs to be redirected to the purchase page with the form of details input.
• Then user submits the form - request sent to the backend and new order is created.
• User should see a message that order created and he need to pay for it.

To do:

• add one more page where all the users will be displayed
• add a button along with the user "add to black list".
• When admin clicks on that button, user is marked as BLOCKED. His status becomes from ACTIVE to BLOCKED.
• In the authorization, if we see that use r is blocked we need to return him a message to contact to administration.

To do:

• create ProductsController with the same methods as in the ProductsService
• create OrdersController with the same methods as in the OrderService
• create logging incoming requests and outcoming responses.
  Spring Boot REST API, Service Layer Implementation

To do:

• add swagger support to the application

Swagger UI example Configuration with Spring Boot in 3 minutes

To do:

• annotate your Service classes with @Service annotation

use dependency injection:

• create service for customers

In you save or update method, you firstly validate incoming data;
after you convert DTO to the entity object;
after you call your repository save() method to save new entity in the database.

• create a package Service
• create YourEntityService interfaces
• Create DefaultYourEntityService classes that implement the above interfaces accordingly

YourEntity - is a placeholder for your entity classes. If you have a UserEntity, you need to create UserService and DefaultUserService accordingly.

• create save, update, delete, findAll, findById methods and implement them
• create service for service
• create save, update, delete, findAll, findById methods and implement them
• create OrderService with the create, update, findByUser, findAll methods. In the create method you need to save order with the NEW status
• make findall using pagination
• USE dto layer
• Make sure you validate fields before saving. Please, use custom exceptions for validation. I also suggest you to use DTO classes to transfer object from service layer to repository.
  pagination for the findAll method
  why you should use DTO instead of entity
  What is the point of using DTO (Data Transfer Objects)?
  DTO Wikipedia
  Краткое введение во внедрение зависимостей: что это и когда это необходимо использовать
  YouTube Spring Boot, JPA, REST, Postgresql, JUnit, Mockito, Thymeleaf, Ajax

##To do:

• create a spring boot app
• dependencies: web, data-jpa, lombok, postgres

To do

• make tests for customer service
• make tests for product layer

dzone.com Spring Boot: Unit Testing and Mocking With Mockito and JUnit - DZone Performance
Пишем JUnit тесты на Java | Java master
JUnit Mockito tutorial with Spring Boot
Руководство для начинающих по HTTP и REST
Введение в JSON
Обзор REST. Часть 1: что такое REST

[BACKEND]

To do:

• When new order is created, you need to send an email to users with ADMIN role
• create a NotificationClient interface and a NotificationClientImpl class with the implementation of notification client with a single method: sendEmailNotification.
• In the sendEmailNotification you should call notification-app endpoint which sends emails
• use Kafka and RestTemplate to communicate between microservices (kafka must be paid for heroku
• create 2 implementations of NotificationClient. One is KafkaNotificationClient and another is NotificationClientImpl which will be default implementation

I suggest you to use RestTemplate because if you deploy application to Heroku - kafka is not going to be in the free plan.
But for the local purposes you can use kafka to communicate between microservices.

This video will help you to communicate your microservices via RestTemplate
This video will help you to setup kafka as communication channel

To do:

• find appropriate simple template form on codepen
• make ajax request to the server
• create a frontend folder in the root of application
• create file index.html and paste the template
• create css, js, img folders inside the frontend folder
• need to use AJAX call to get all the products and display them on the page

Codegen
Shop temlate on Codegen
Spring Boot, JPA, REST, Postgresql, JUnit, Mockito, Thymeleaf, Ajax
Online book JavaScript

Manage products can only ADMIN of application. We need to secure the product management.

To do:

• Add Spring Security and JWT functionality to the application
• create register, login forms

Spring Security: REST Security With JWT
Spring Security с помощью JWT токена | Java master
Java Web Project Part 9 | Create Login and Register Form From Scratch with Java and ReactJS

To share the result of your work, you need to deploy the application to some server.We can use free Heroku server.

To do:

• [Frontend] Deploy frontend to the free server
  • change the url constant to the remote server url
  • find a free hosting where you can put your HTML files. you can check this one Бесплатный Хостинг с поддержкой PHP, MySQL и cPanel.
  • put all the frontend logic to the hosting
  • make sure everything works fine.

Deploy Java Web Application to Heroku free server Spring Boot example
Free hosting

To do:

• create standalone app - Notification app
• create a controller which receives body with email, body of the message, subject of the message.
• in the service call email provider (use google) to send email
• save notification detail in the DB. create a single db table notification_details.
  In this table will be the next fields:
  • id,
  • type,
  • body,
  • subject,
  • receiver,
  • created_date.
• add swagger documentation

Send Email with Spring Boot and Gmail

To do

• make an UVL diagramm for DB
• establish connection to DB PostgreSQL (using Docker or not)
• create JPA repo
• make Entities
  Docker - основы | Java master
  Виртуальная машина (VM) vs контейнер | Java master
  Docker & Docker Compose for Java Spring Apps | Microservices Tutorial
  How To Start Online Store Development: Part 1 - [Database Design]
  PostgreSQL CREATE TABLE
  Разница JDBC, JPA, Hibernate, Spring Data JPA | Java master
  Что такое hibernate | Java master
  Spring: обзор фреймворка для самых маленьких | Java master
  Spring Boot — пример с Postgres и JPA | Java master
  Связь ManyToMany в Hibernate | Java master
  Connect Java App to DB Postgres Spring Data JPA with Example - Online Store Development: Part 4

[FRONTEND]

To do:

• add frontend pagination

Pagination with Spring Boot JPA and Frontend on JS | Simple Example