Spring Boot 4 REST API Tutorial 🚀 | CRUD, Exception Handling & Swagger

Description

Build a production-ready REST API using Spring Boot 4 by following real industry best practices — not just CRUD basics. In this video, you’ll learn how to design a clean, scalable REST API step by step using the latest Spring Boot 4, Java records, proper DTOs, global exception handling, validation, and Swagger documentation. By the end of this tutorial, you will be able to confidently build REST APIs that are: Interview-ready Production-friendly Easy for clients to consume This is Part 1 of our Spring Boot REST API series. What You’ll Learn in This Video REST API design best practices (URLs, HTTP methods, status codes) Build full CRUD APIs with Spring Boot 4 DTO vs Entity – why exposing entities is a bad idea Constructor-based Dependency Injection (no field injection) Global Exception Handling using @RestControllerAdvice Custom error response structure (APIError) Proper use of HTTP status codes (200, 201, 204, 404, 500) Using H2 in-memory database with Spring Boot 4 Handling Optional, orElseThrow, and custom exceptions Swagger / OpenAPI documentation for REST APIs Validating request payloads (Bean Validation) REST API patterns expected in real interviews ⏱️ Timestamps 00:00 – Introduction 01:25 - What You’ll Build 02:47 - REST API Project Setup 04:00 - API Versioning 06:16 - REST CRUD: POST & @RequestBody 09:38 – Method Names & URL Design in REST APIs 10:24 – Designing the Service Layer 11:47 – Designing the Repository Layer 13:38 – Designing the Entity 18:33 – Configuring H2 Database in Spring Boot 4 26:30 – ResponseEntity & HTTP Status Codes 35:01 – REST CRUD: GET (Find by ID) 42:46 – Handling Exceptions in REST APIs 45:34 – Global Exception Handling with @RestControllerAdvice 48:55 – Using @ExceptionHandler 49:56 – Designing a Standard Error Response 55:31 – Creating Custom Exceptions 01:01:12 – Code Improvement: Java Optional.orElseThrow() 01:02:27 – Documenting REST APIs with OpenAPI / Swagger 01:06:59 – REST CRUD: GET ALL 01:08:55 – REST CRUD: DELETE 01:10:56 – REST CRUD: UPDATE (PUT) 01:16:18 – Adding Validation to REST APIs 01:25:09 – Database Setup using data.sql 01:29:08 – What’s Next in This REST API Series For More free/paid courses visit www.seleniumexpress.com Who This Video Is For ? ✔️ Java Developers (Beginner to Intermediate) ✔️ Spring Boot developers upgrading to Spring Boot 4 ✔️ Developers preparing for REST API / Microservices interviews ✔️ Anyone who wants to write clean, review-ready backend code #springboot #restapi #springrest 🎓 Related Courses – For reference 📘 Java Streams & Lambda Expressions https://www.youtube.com/watch?v=nQ4B_EWnAvI&list=PL3NrzZBjk6m-jblxwCFWxtvCeYGv05rmj ⚡ Reactive Java with Project Reactor https://www.youtube.com/watch?v=-AnAd7rR2Qk&list=PL3NrzZBjk6m-RrIn2ndllgEnIHpOmz2v3 🔁 Generics in Java Explained https://www.youtube.com/watch?v=V-Sg8K4oINU&list=PL3NrzZBjk6m8BqPhWC700B1TnG9XUlLdT 🌐 Spring Boot Crash Course https://www.youtube.com/watch?v=F_rGkDeihBg&list=PL3NrzZBjk6m-P7k8tmq1wJOdJ0_ZpPxbp ▶️ Spring Boot Microservices https://www.youtube.com/watch?v=T2rBkbT50TE&list=PL3NrzZBjk6m_n8QZCdnF7Yax36cqWkO9j ▶️ Apache Kafka Essentials https://www.youtube.com/watch?v=MkcrLzbu9tc&list=PL3NrzZBjk6m_dQzvBuD6Yn9Tj9xNTmyhl ▶️ Spring Bootcamp (FREE) https://www.youtube.com/watch?v=ZTv6uQ2AlA8&list=PL3NrzZBjk6m_7F2vyEW8DWmUTmnkb_IS3 ▶️ Spring Live Mock Interview https://www.youtube.com/watch?v=yX2w-Sof95s&list=PL3NrzZBjk6m_Md4nG1uF5113-Z0yVRoA0 Feel free to ask for support. Email me at seleniumexpress@gmail.com For More free/paid courses visit www.seleniumexpress.com Facebook https://www.facebook.com/seleniumexpress Facebook support Group “SeleniumExpress - Support" https://www.facebook.com/groups/187000222361579/ Follow me on Insta https://www.instagram.com/selenium_express/ 🔔 Subscribe for More