Applied Domain-Driven Design Blueprints for Jakarta EE

Domain-Driven Design (DDD) is an architectural approach that strongly focuses on materializing the business domain in enterprise software through disciplined object-oriented analysis. This session demonstrates first-hand how DDD can be elegantly implemented using Jakarta EE via an open source project named Cargo Tracker.

Cargo Tracker maps DDD concepts like entities, value objects, aggregates and repositories to Jakarta EE code examples in a realistic application. We will also see how DDD concepts like the bounded context are invaluable to designing pragmatic microservices.

Transcript

1. COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0) 1
   Reza Rahman
   Jakarta EE Ambassador, Author, Blogger, Speaker
   reza_rahman@lycos.com
   @reza_rahman
   Applied Domain-Driven Design
   Blueprints for Jakarta EE
   

   View Slide

2. 2
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   ● J2EE popularized the idea of server-side architectures
   ○ J2EE Blueprints (aka “Java Pet Store”)
   ● J2EE Blueprints had profound impact, but not without its problems
   ○ Many of the paradigms are alive and well even today
   ○ Encumbered by the immaturity of the technology/industry
   ● Domain-Driven Design (DDD) emphasizes a return to the roots of object-oriented
   analysis and design
   ● Jakarta EE’s lightweight programming model fits DDD philosophy well
   ○ The Cargo Tracker project completes the circle
   The Cargo Tracker Project
   

   View Slide

3. 3
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   The Building Blocks
   

   View Slide

4. 4
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Entities
   

   View Slide

5. 5
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Value Objects
   

   View Slide

6. 6
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Aggregates
   

   View Slide

7. 7
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Repositories
   

   View Slide

8. 8
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Factories
   

   View Slide

9. 9
   COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
   Services
   

   View Slide

10. 10
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Separating Concerns
    

    View Slide

11. 11
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Interface Layer
    

    View Slide

12. 12
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Application Layer
    

    View Slide

13. 13
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Domain Layer
    

    View Slide

14. 14
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Infrastructure
    

    View Slide

15. 15
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Mapping DDD to Jakarta EE
    

    View Slide

16. 16
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Interfaces
    

    View Slide

17. 17
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Application Layer
    

    View Slide

18. 18
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Entities
    

    View Slide

19. 19
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Value Objects
    

    View Slide

20. 20
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Infrastructure
    

    View Slide

21. 21
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Repositories
    

    View Slide

22. 22
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Bounded Context
    

    View Slide

23. 23
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    Jakarta EE + DDD in Action
    https://eclipse-ee4j.github.io/cargotracker/
    

    View Slide

24. 24
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    ● DDD great architectural blueprint for Java applications
    ● Jakarta EE very natural fit for DDD
    ● Cargo Tracker great place to get started with DDD and Jakarta EE
    Summary
    

    View Slide

25. 25
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    ● Cargo Tracker
    ○ https://eclipse-ee4j.github.io/cargotracker/
    ● Getting Started with Domain-Driven Design
    ○ https://dzone.com/refcardz/getting-started-domain-driven
    ● Domain-Driven Design Quickly
    ○ http://www.infoq.com/minibooks/domain-driven-design-quickly
    ● Jakarta EE Tutorial
    ○ https://eclipse-ee4j.github.io/jakartaee-tutorial/
    ● Jakarta EE Examples
    ○ https://github.com/eclipse-ee4j/jakartaee-examples/
    Resources
    

    View Slide

26. Thank you!
    COPYRIGHT (C) 2021, ECLIPSE FOUNDATION, INC. | THIS WORK IS LICENSED UNDER A CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE (CC BY 4.0)
    

    View Slide