What is Inter-service Communication? How one microservice talks to another to: Fetch data Trigger actions Share events There are two main approaches: Synchronous (REST/HTTP) Asynchronous (Messaging – Kafka/RabbitMQ) 🔹 1️⃣…
What is an API Gateway? An API Gateway is a single entry point for all client requests in a microservices architecture. Instead of clients calling multiple microservices directly, they call…
Step 1: Understand the Business Requirement Before writing code, clarify: What problem does the service solve? What is its single responsibility? 👉 Example:“Order Service” → only handles order creation, update,…
What is Monolithic Architecture? A monolithic application is built as one single unit where: UI Business logic Database accessare all tightly coupled and deployed together. 📌 Example:One WAR/JAR contains user…
@Conditionalproperty use case use case1 We want to create only 1 bean, either a MySQL component or a NoSQL component use case -2 We have 2 components sharing the same…
Spring Boot Simplifies Java Servlet Management Before we talk about Spring Boot, first we need to understand "Servlet" and "Servlet container". They provide a foundation for building a web application.…
🧠 Java String – Complete Notes 📘 Basics In Java, String is a class in the java.lang package. Immutable – Once created, it cannot be changed. Internally uses: char[] before…
