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Stop Bad Data at the Door: Spring Boot Validation Explained!

🎯 Your API is only as strong as the data it accepts. Tired of dealing with null pointers, cryptic errors, or inconsistent inputs breaking your backend logic? You’re not alone — and the fix is simpler than you think. In this video, I’ll show you how to build rock-solid APIs with Spring Boot by mastering validation. Whether you’re just using @Valid and @NotNull or ready to level up with custom validators, this is your go-to guide for writing clean, defensive API contracts. We’ll cover: ✅ Why input validation is your first line of defense ✅ How to use annotations like @Size, @Min, and @Email ✅ What’s really happening under the hood with @Valid ✅ How to create your own custom validation annotations ✅ Bonus: how to return user-friendly error messages the right way This isn't just theory — you’ll get real code examples, best practices, and the mindset shift that separates amateur APIs from professional, production-grade services. Chapters: 00:00 Intro 00:52 Manual Validations 03:53 Concept: Where to Put Your Validations? 05:10 Getting Starter With Bean Validation 09:14 Returning Meaningful Error Responses 16:37 Custom Validator - Write Your Own Logic 21:57 That's All Folks! 📌 Based on the full in-depth blog post 👉 https://igventurelli.io/building-robu... 🫘 Bean Validation Spec: https://beanvalidation.org/2.0-jsr380/ 👮🏻‍♂️ ControllerAdvice blog post: https://igventurelli.io/handling-exce... 📥 Download my free eBook Mastering Spring Boot Project Structure and start building APIs like a pro: https://spring-structure.igventurelli... 🔔 Subscribe to stay ahead with the best content on Spring Boot, Java, and modern backend architecture. 🔥 Drop a comment: What’s your favorite validation trick in Spring?