Build & Deploy Modern eCommerce App | Java | Spring | React

Explore how Spring Boot builds production-ready apps with auto configuration, starter dependencies, Spring Initializer, and an embedded server, while following convention over configuration.

Explore REST APIs, a stateless, resource-based web service approach using standard http methods to enable scalable, interoperable communication with representations like json, xml, or html and hypermedia navigation.

Explore spring annotations as metadata that configure beans and enable dependency injection, aspect oriented programming, and transaction management, with examples like @Component, @Service, @Repository, and @RequestMapping.

Create your first spring boot controller by scaffolding a demo controller inside a main package, annotating with @Controller and @RequestMapping, and defining a get method for hello.

Define the contact service interface and its implementation to perform CRUD operations (add, update, get by id, get all, delete) and inject the JPA repository via a constructor.

Wrap up previews Spring Boot basics, introduces React basics, and guides you to set up a startup project for hands-on, practical experience with Spring Boot and React.

Explore how react hooks enable state and lifecycle management in functional components. Discover useState and the top-level rules for calling hooks only in react components or custom hooks.

Explore event handling in React, binding onClick and other events in JSX, passing arguments with arrows, and using handle prefixes for cleaner handlers.

Learn how to render elements conditionally in react using if statements, the ternary operator, logical and, and switch cases, with examples like isloggedin, notifications, and status (loading, error, success).

Create a simple todo app in react using Veed, install dependencies with npm, and run npm run dev to view it at 5173.

Create a handle edit function as a click event handler for todos, pass the todo index, and set the input value and edited index to enable editing.

Learn how to toggle a todo's completed state by mapping the todo array, comparing indices, and updating the list to strike or restore items as you click.

Implement the todo form in a React app, using inline styles, input change handling, add and edit logic, delete actions, and conditional rendering to display todos.

Test the system by adding, editing, completing, and deleting to-dos to verify the app functions. Prepare for deeper study and mastery in the next section.

Explore user use cases for both customers and admins: customers create accounts, login, browse and manage the cart, and checkout via PayPal or Stripe; admins login and manage products.

Install the Java JDK (preferably JDK 21), an IDE (IntelliJ or Eclipse), Node.js, and MySQL to prepare for a Spring Boot back end and a React front end.

Define and implement user, cart, order, and row entities in IntelliJ, establishing many-to-many and one-to-many relationships, with join tables and an order status enum (pending, processing, shipped, delivered, canceled).

Implement the product service layer by wiring a JPA repository, providing retrieval methods (all, by id, by category and brand), and preparing for add, update, and delete operations.

implement the add product method in the product service by validating uniqueness of name and brand, creating or linking a category, and saving the new product.

Explore how global and specific exception handlers work in a Spring Boot app. See how entity not found and product not found errors propagate to provide clear messages.

Implement the user service by wiring the user repository, adding create, update, get by id, and delete methods, with entity not found and exists checks.

Learn to test the user API with postman, validate unique emails, and implement user DTO mapping using model mapper to prevent exposing passwords in responses.