Migrating to Modular Monolith using Spring Modulith and IntelliJ IDEA | The IntelliJ IDEA Blog

As applications grow in complexity, the traditional package-by-layer approach often results in tightly coupled, hard-to-maintain code, prompting the need for a modular architecture. Spring Modulith, in conjunction with IntelliJ IDEA, offers a solution by transforming monolithic applications into modular monoliths with explicit boundaries and clear public APIs. This approach organizes code by business capabilities rather than technical layers, reducing coupling and enhancing maintainability. Spring Modulith facilitates event-driven communication between modules, enabling easier extraction of modules into separate services if needed. It also supports gradual migration from existing monoliths, allowing developers to refactor incrementally. IntelliJ IDEA enhances this process by providing real-time feedback on modular structure violations and offering quick-fixes, making modularity a seamless part of the development workflow. Through continuous verification and documentation generation, developers can maintain and evolve the modular structure effectively, ensuring the codebase remains scalable and adaptable to future changes.