Workshops

Modular Monolith with Spring Modulith

Victor Rentea - Victor Rentea Consulting

The Modular Monolith Architecture is both a crucial staging ground when refactoring a legacy monolith, as well as the architecture of choice for many long-lived projects in complex domains. Join this training to develop strong foundational knowledge and learn many practical details about this architecture style.

Objectives

• Master one of the trendiest architectural styles today
• Understand options to split code vertically by functional area and their tradeoffs
• Learn to safely evolve architecture, without large rewrites
• Gain practical insights on how to use Spring-Modulith framework in real life

Who is it for?

• Architecturally-interested developers speaking Java (but not only)
• Leads or architects looking to debate current trends in architecture
• Engineers planning to break a monolith into microservices, or to merge back nano-services

What to expect?

• Explanations in simple terms, with many analogies and visuals
• Very interactive teaching style
• Countless debates on topics of interest to you
• 🛠️ Hands-on exercises

Agenda

Introduction

• The 3 Laws of Architecture
• Architectural Quantums
• Definition of a Module in a Modulith

Code Decoupling

• Strategies to move from Technical to Functional Partitioning
• Internal Architecture of a Module
• Designing Module API 🛠️
• Enforcing Module Boundaries 🛠️

Module Dependencies

• Seven patterns of module interaction
• Event-based Module Integration
• The “shared” Module: best practices and pitfalls
• Fixing module dependency cycles 🛠️

Data Decoupling

• Stage: Single Writer
• Database Refactoring Techniques 🛠️
• Stage: Private Tables ± exposing views 🛠️
• Stage: Private Consistency: transaction boundaries and foreign keys

Modulith Deployment

• Packages vs Build Modules (like Maven/Gradle)
• Service-Oriented Architecture 🛠️
• Release Cycle
• Module-Scoped Tests 🛠️

Towards Microservices

• Weaknesses of Modular Monolith
• Architectural Qualities (NFRs)
• Pros and Cons of Microservices
• Steps to extract a Module as a Microservice 🛠️

Wrap-up: main take-aways

Prerequisites:

• JDK 17
• Maven
• Java IDE (recommended: IntelliJ)
• Unrestricted access to GitHub & Maven Central