🌱 Spring Boot – Dependency Injection (DI)
🌱 Spring Boot – Dependency Injection (DI) 1️⃣ What is Dependency Injection? Dependency Injection (DI) is a design pattern in which the dependencies of a class are provided from…
Spring Boot – Controller Layer Annotations (Part-1)
🌱 Spring Boot – Controller Layer Annotations (Part-1) 1️⃣ @Controller 🔹 What is @Controller? @Controller indicates that a class is responsible for handling incoming HTTP requests. It is a…
Spring Boot – Bean and Its Lifecycle
🌱 Spring Boot – Bean and Its Lifecycle 1️⃣ What is a Bean? A Bean is a Java object that is created, managed, and destroyed by the Spring IoC…
All about Maven
1️⃣ What is Maven? Maven is a build automation and project management tool used primarily for Java and Spring Boot applications. 🎯 Problems Maven Solves Build generation (compile, test,…
Project Setup & Layered Architecture
Project Setup & Layered Architecture 📌 1. Introduction to Spring Boot Spring Boot is a framework built on top of Spring Framework that simplifies application development, configuration, and deployment. 🔑…
Introduction to Spring boot | Its Advantage over Spring MVC and Servlets
1️⃣ Servlet and Servlet Container 🔹 What is a Servlet? A Servlet is a Java class that handles HTTP requests and generates HTTP responses. It acts as a bridge between…
What is Event-Driven Architecture and what is the role of Kafka in Microservices?
What is Event-Driven Architecture (EDA)? In Event-Driven Architecture, services: Produce events when something happens Consume events asynchronously Do not wait for each other 👉 Services are loosely coupled. 📌 Example…
How are Distributed Transactions handled in Microservices? (Saga Pattern)
Why Distributed Transactions Are a Problem? In microservices: Each service has its own database Traditional 2PC (XA transactions) don’t scale well High latency & tight coupling 👉 So we use…
How does Authentication & Authorization work in Microservices (JWT & OAuth2)?
Authentication vs Authorization Authentication → Who are you? (identity) Authorization → What can you access? (permissions) 🔹 Challenge in Microservices Multiple services Stateless REST APIs Shared security logic Avoid session…
What is Service Discovery and how does Eureka work?
What is Service Discovery? In microservices, service instances: Scale up/down dynamically Change IPs frequently 👉 Service Discovery helps services find each other dynamically without hard-coded URLs. 🔹 Types of Service…