intermediate~2h
Shared BOMs and Multi-Module Dependency Management
A fleet of microservices that each pin their own dependency versions will drift apart one upgrade at a time. A shared Bill of Materials (BOM) module centralizes version decisions in one place every service inherits from, and this module covers building and consuming one.
Learning objectives
- Beginner: Explain what a BOM (Bill of Materials) is and how it differs from a regular dependency.
- Beginner: Describe the version-drift problem that emerges when each microservice pins its own dependency versions independently.
- Intermediate: Build a parent BOM module declaring managed versions for shared libraries across several services.
- Intermediate: Consume a shared BOM from a service's own pom.xml using dependencyManagement import scope.
- Advanced: Design a BOM versioning and release strategy so upgrading a shared dependency doesn't force every service to update simultaneously.
- Advanced: Explain the tradeoff between a shared BOM's consistency benefits and the coupling it introduces across teams.
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Shared BOMs and Multi-Module Dependency Management