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Spring Boot 4 Microservices & REST APIs · Lesson

Decomposing Monoliths to Microservices

Learn strategies for breaking down large monolithic applications into smaller, independent services.

What is a Monolith?

Before we break things apart, let's understand what a monolithic application is.

A monolith is a single, large application where all components—like the user interface, business logic, and data access layers—are tightly coupled within one codebase.

Think of it as a single, giant block of software.

Monoliths: The Growing Pains

While easy to start, monoliths often face challenges as they grow:

  • Slow Development: Large codebase means longer build times and complex merges.
  • Scaling Issues: To scale one part, you must scale the entire application.
  • Technology Lock-in: Hard to introduce new technologies without rewriting the whole system.
  • Deployment Risk: A small change requires redeploying the entire application, increasing risk.

All lessons in this course

  1. Decomposing Monoliths to Microservices
  2. Inter-Service Communication Basics
  3. Event-Driven Architectures Overview
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