Spring Modulith is a framework designed to support modular monolithic architectures, aligning perfectly with the Modulith First approach. Built on top of the Spring ecosystem, it provides tools to enforce modular boundaries, promote clean architecture, and simplify the transition to microservices if needed.
Spring Modulith builds on ArchUnit, a library for testing architectural constraints in Java applications. Its seamless integration with the Spring ecosystem makes it an easy adoption for teams already familiar with Spring Boot.
The event-driven communication model helps decouple modules through domain events, while the module verification feature detects cyclic dependencies and ensures that modules adhere to defined boundaries.
However, adopting Spring Modulith requires a disciplined approach to modular design. Teams must invest time in defining clear module boundaries and consistently enforce them throughout the development lifecycle.