Spring Boot Basics

In Spring Boot, @Component, @Service, and @Repository often confuse developers because they look similar and sometimes behave the same. Many tutorials say: “They are just stereotypes — no real difference.” That is partially true — and dangerously misleading in production systems. In this guide, we’ll clearly explain: Why This Confusion Exists All three annotations: Example:

Dependency Injection (DI) is one of the core foundations of Spring Boot.It is not just a framework pattern — it is the reason Spring applications are scalable, testable, and maintainable. In this production-grade guide, you’ll learn: This article is designed for beginners, intermediate developers, and architect-level engineers alike. What Is Dependency Injection? Dependency Injection is

Spring Boot reads configuration from multiple sources —but the order in which these sources are applied matters. Understanding this order helps you: This guide explains Spring Boot’s configuration loading order in a practical, production-ready way, with examples and best practices. What Is Configuration Loading Order? Spring Boot supports configuration from: However, these sources are not

Understanding how a Spring Boot application starts is essential for diagnosing startup failures, configuration issues, bean instantiation problems, and production-grade deployments. This guide explains the complete Spring Boot startup process — from JVM launch to the application being ready to serve requests — in a step-by-step and production-aware way. This article is ideal for: What

Spring Boot configuration is one of the most misunderstood areas for beginners and one of the most critical areas for production systems. In this guide, you will learn how Spring Boot configuration and profiles actually work, why they exist, and how they are used in real-world production environments. This article is written for: What Is

One of the first decisions every Spring Boot developer faces is choosing betweenapplication.properties and application.yml. At first glance, both look simple.In real-world and production systems, choosing and using them correctly makes a big difference in readability, maintainability, and configuration safety. This article explains: What Is application.properties? application.properties is the default configuration file in Spring Boot.

When you start with Spring Boot, creating a project is simple. Understanding why the project is structured the way it is is what turns a beginner into a confident Spring Boot engineer. This guide explains the Spring Boot project structure clearly — starting from the basics and extending to real-world, production-grade best practices used in

Starting with a “Hello World” application is the simplest and most effective way to understand how Spring Boot works.This guide walks you through creating, running, and understanding your first Spring Boot application, while also explaining what happens behind the scenes in real-world systems. This post is designed for: What Is a Spring Boot Hello World