As applications grow in complexity, maintaining a clean architecture becomes increasingly challenging. The traditional package-by-layer approach of organizing code into controllers, services, reposito

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Spring Modulith combined with IntelliJ IDEA provides a structured path for migrating traditional package-by-layer Spring Boot monoliths into modular monoliths. The guide walks through the problems of layer-based packaging (tight coupling, unclear boundaries, spaghetti code), then covers how to reorganize code into feature-based modules, enforce boundaries using Spring Modulith's verification, expose public APIs via facades and named interfaces, and use event-driven communication for cross-module side effects. IntelliJ IDEA Ultimate adds editor-time inspections, quick-fixes, module visualizations, and dependency completion to catch violations without running tests. The migration is incremental: reorganize packages, add Spring Modulith dependencies, run ModularityTest, and fix violations step by step.

Migrating to Modular Monolith using Spring Modulith and IntelliJ IDEA

1. The Problem with Monoliths and Package-by-Layer

3. How to Add Spring Modulith to a Spring Boot Project

4. Converting a Monolith into a Modulith: Refactoring to Package-by-Module

5. How does IntelliJ IDEA Help with Inspections and Quick Fixes?

6. Verifying and Evolving Your Modular Structure