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Legacy Modernization with DDD and Spring Boot

Basics
3 Days
12
Seats
German and English
Online and in-person
Available on request

Also available as in-house training

We run this training exclusively for your team, online or on site.
In-house Offerings

In this training, you’ll learn how to systematically implement DDD concepts in Spring Boot applications. You’ll learn how to use Event Storming to identify bounded contexts, structure them as modules using Spring Modulith, and validate their architecture with ArchUnit and jMolecules. Throughout the course, we’ll work on a realistic legacy codebase that exhibits typical problems found in mature monolithic systems - so you can apply what you’ve learned directly to your own projects.

Objectives

  • Conduct event storming and translate the results into bounded contexts.
  • Implement tactical patterns (entities, value objects, aggregates) and understand how they differ from typical Spring patterns.
  • Use Spring Modulith to define and test modules and enable them to communicate via events.
  • Validate architectural rules with ArchUnit and jMolecules.
  • Introduce DDD into existing systems - incrementally and without a big-bang rewrite.

Curriculum

DDD Fundamentals

  • Strategic Design
    • Collaborative Modeling: Event Storming
    • Bounded Contexts
    • Context Mapping
    • Ubiquitous Language
  • Tactical Design
    • Entities, Value Objects, Aggregates
    • Repositories & Domain Services
    • Domain Events

Modern Spring Architecture

  • Modular Monoliths
    • Application Modules with Spring Modulith
    • Module Testing & Documentation
  • Rich Domain Model
    • Tactical Design in Code with jMolecules
    • Testing the Tactical Structure
    • Clean Code
  • Architectural Styles
    • Layered/Hexagonal/Onion Architecture
    • Using Predefined ArchUnit Architecture Rules

Migration & Evolution

  • Introducing DDD into existing systems
    • Identifying Bounded Contexts in legacy code
    • Strangler Fig Pattern & incremental modernization
  • Outlook: From Monolith to Microservice

Optional

  • Clean Architecture
  • Event-based communication
  • CQRS & Event Sourcing

Audience

  • Experienced Spring Boot developers who want to structure their applications more effectively and ensure they remain maintainable over the long term.
  • Software architects who understand DDD concepts and want to implement them within their teams.
  • Tech leads and senior developers who face the challenge of modernizing legacy monoliths without rewriting everything from scratch.

Requirements

  • Solid knowledge of Java and Spring Boot (controllers, services, repositories, dependency injection)
  • Basic understanding of software architecture
  • Personal laptop with an IDE and Java 17+

Description

Why Domain-Driven Design with Spring Boot?

Many Spring Boot applications start out well-structured—but as complexity grows, the boundaries between business domains blur. What began as a clear-cut monolith turns into a “Big Ball of Mud”: services call each other, entities proliferate across module boundaries, and no one dares to make major changes anymore.Domain-Driven Design (DDD) offers proven strategies to counteract this erosion. It helps identify domain boundaries, establish a common language with the business, and consistently align the software architecture with the domain.

As the “DORA State of AI-based Software Development” Report shows, the use of coding agents amplifies both the good and the bad aspects of existing codebases. In other words, AI can add high-quality code to well-structured, clean code, but when applied to a poor-quality codebase, the quality will decline further. Therefore, domain-driven design and clean code will remain highly relevant skills in the future.

Trainers

Martin Günther

Independent software architect and technical coach

Main Skills

Domain-driven design, collaborative modeling, modern software architecture

Nicole Rauch

Freelance Software Developer

Main Skills

Domain-Driven Design, React/Redux, Clean Code, Functional Programming

In-house Training

You can also book this training as an in-house training course exclusively for your team. Please use the enquiry form for more details.

Enquire now

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Frequently Asked Questions

What is the maximum number of participants in a training session?

For most training sessions, we limit the maximum number of participants to 12 per instructor. This allows us to ensure that you receive the best possible guidance.

Are meals provided during in-person training sessions?

Of course, we’ll take care of your meals during our in-person training sessions. We usually provide snacks twice a day and lunch. Drinks are also available.

Where can I find information about the training session I've already booked?

You can find all the information about your training in our socreatory Navigator. Here, in addition to useful links and information, you’ll find the specific location of the training for in-person sessions and the link to the video call for online sessions.

When and how will I receive my certificate of attendance after the training?

If you have attended at least 75% of the sessions, you will receive a certificate of attendance from us. You can download it from our socreatory Navigator a few days after the training.

Why socreatory?

Beyond the expertise of our trainers and our wide range of training courses, we offer even more compelling reasons to train with us.

All the benefits at your fingertips – download our program overview!

Unique Variety

We offer you the most comprehensive training program for software architecture in the German-speaking region – accredited and certified by iSAQB®.

Powerful IT expertise

Our experienced trainers are renowned experts in the industry and have co-developed 80 percent of the module curricula, both in terms of content and teaching methodology.

Hands-on learning experience

We are committed to providing interactive and engaging learning experiences, ensuring all participants can directly apply what they've learned.

Fair pricing model

The total price is reduced for as few as two participants from your company. Furthermore, you benefit from early bird pricing and enhanced planning certainty.

Looking for team training?

Unlock your team's potential with our specialized software architecture courses. We offer a variety of options, from in-depth iSAQB® training to customized workshops tailored precisely to your company's needs. Discover how these training programs can enhance your team's skills, and take advantage of attractive group and package discounts to maximize the value of your investment.