Spring Boot

Reactive Programming with Spring Boot

🔹 What is Reactive Programming? Reactive Programming is an asynchronous, non-blocking programming paradigm built around the idea of data streams and event-driven systems. Instead of executing tasks sequentially and blocking...

Path variable vs Query Parameters in Spring Boot

Big idea Path Variable: part of the resource’s identity./users/{id} → “that specific user”. Query Param: filters/tweaks how you retrieve a resource (search, sort, paginate, flags)./users?role=ADMIN&page=2&size=20. TL;DR table Aspect Path Variable...

Global Exceptions Handling in Spring Boot

In Spring Boot, a global exception handling mechanism allows you to catch and handle exceptions across the whole application in one central place — rather than duplicating try-catch logic everywhere....

What is @Qualifier?

1. What is @Qualifier? @Qualifier is an annotation in Spring used to resolve ambiguity when multiple beans of the same type exist in the Spring ApplicationContext. It tells Spring: "If...

🧠 AOP in Spring Boot

What Is AOP? AOP (Aspect-Oriented Programming) is a programming paradigm that helps separate cross-cutting concerns — logic that’s common across multiple parts of an application, like: Logging Security Transactions Performance...

🔒 Step-by-Step HTTPS Request Flow in Spring Boot

1. 🔐 HTTPS Client Request A browser or REST client (like Postman) sends a secure HTTPS request:https://yourdomain.com/api/data The request is encrypted using TLS/SSL. 2. 🌐 SSL Termination (Optional) In production, SSL...