spring-modulith

Enforcing module boundaries in a Spring modular monolith involves defining public versus internal packages and verifying access rules using ArchUnit-style Spring Modulith test utilities. This prevents illegal cross-module internal access and maintains a clean package structure.

Replacing direct service calls with application events in Spring requires publishing domain events from one module and consuming them in another using ApplicationModuleListener. This decouples inter-module communication and enables reliable event-driven architecture.

Testing module integration and event publication in isolation uses a Spring Modulith application-module test harness to verify a single module's behavior. This validates inter-module domain event publication without needing to load the entire monolith.

Structuring bounded contexts in a Spring application is best achieved by establishing safe modular monolith architecture with clear module boundaries. This isolates internal packages and replaces direct service calls with application events for decoupled communication.

Spring Modulith supports reliable event publication storage by ensuring domain events published from a module are reliably persisted before consumption. This guarantees event-driven communication is completed even across transactional boundaries.

ArchUnit verification for Spring module boundaries is needed when structuring bounded contexts to detect illegal cross-module internal access. It helps maintain a clean package structure as the codebase evolves and prevents unwanted coupling.