Oliver Drotbohm
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odrotbohm.de
Oliver Drotbohm
@odrotbohm.de
1.2K followers 130 following 250 posts
Frameworks & Architecture in the Spring open source engineering team, all things Spring, Java, data, DDD, REST, software architecture, drums & music. He/him.
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odrotbohm.de
A night to remember with Phil Siemers… 🫶 #waswenndoch #schonheute
October 19, 2025 at 7:49 AM
odrotbohm.de
Gotta love i18n’ed error messages: „Die Datenbank-Verbindung wurde nicht explizit geschlossen (jetzt in der Müllabfuhr)“ 😅 #java #garbagecollection
A screenshot of a Java exception using an internationalized exception message translating "The connection was not closed by the application and is garbage collected" to "Die Datenbank-Verbindung wurde nicht explizit geschlossen (jetzt in der Müllabfuhr)".
October 17, 2025 at 9:58 AM
odrotbohm.de
Application-module-aware #Flyway migrations have just landed in #SpringModulith! Check out the reference docs for details. docs.spring.io/spring-modul... 🍃📦
Application-Module-Aware Flyway Migrations As of Spring Modulith 2.0, we support the execution of module-specific Flyway migrations. Application modules are encouraged to define migrations for their own persistent data only, which means that these migrations have to be executed in the order of the module dependency tree. Assume a default Flyway setup with migrations located in classpath:db/migration, two application modules first and second (with second depending on first), and an activated spring.modulith.runtime.flyway-enabled configuration property. With that in place we will augment the configured migration to run the default one first, followed by one for classpath:db/migration/first and one for classpath:db/migration/second. By selecting which folder to place the migration files in, you can differentiate migrations always to be run from ones that will only get executed for the corresponding module. The application module test integration will only execute the default migration and the ones for modules included in the test run. We will not augment migration runs including wildcard expressions in the migration location definition.
October 14, 2025 at 3:20 PM
odrotbohm.de
Waving #Devoxx goodbye after a tremendous week. @stephanjanssen.be and team have outperformed themselves again. Being able to catch up with team members has been energizing as well! Safe travels, everyone, and hope to see you next year!

📷 by the amazing @ddoutsiopoulos.bsky.social
Oliver Drotbohm standing on a stage, raising one hand while addressing an audience. In the background, a projector displays text related to evolvable systems. The speaker is wearing a black cap and glasses.
October 10, 2025 at 11:58 AM
odrotbohm.de
BRU ❤️ Java… #Devoxx
A coffee house entrance with a green awning displaying "JAVA coffee house."
October 6, 2025 at 3:13 PM
odrotbohm.de
Boarding DRS to MUC to BRU for #Devoxx… 🛫☕️🍃
A CRJ9 parked at the gate at Airport Dresden, surrounded by trucks delivering fuel and baggage.
October 6, 2025 at 11:03 AM
odrotbohm.de
Thu, Oct 9th, 5:40pm – Meet the Spring Team – m.devoxx.com/events/dvbe2...

With @starbuxman.joshlong.com, @garnier.wf, @tzolov.bsky.social, @0.5ritter.de, @snicoll.be, @chemicl.bsky.social, Brian Clozel, and yours truly. ☕️🍃 5/5
Meet the Spring Team Come meet the Spring team! This year at Devoxx, many maintainers, advocates and contributors will be at the conference, and we’re delighted to meet with our users and members of the community. In this “open mic” session, you’ll have the opportunity to ask us anything about the various Spring projects, our current efforts and ideas for the future, and of course, the soon-to-be-released new generation with Boot 4 and Framework 7. Whether you’re a Spring veteran or a new user getting started with the project, you are more than welcome to join.
October 4, 2025 at 2:37 PM
odrotbohm.de
Thu, Oct 9th, 4:30pm – Domain-centric? Why Hexagonal and Onion Architecture are Answers to the Wrong Question – m.devoxx.com/events/dvbe2... #DDD 4/5
Domain-centric? Why Hexagonal and Onion Architecture are Answers to the Wrong Question To separate technical from domain code, architectural approaches like Hexagonal or Onion Architecture are currently all the rage. However, discussions about their semantic details and their mapping to the source code structure of software projects are at least equally ubiquitous. How much abstraction and mapping between architectural concepts is needed? Is persistence metadata in the domain model heresy? Above all: what is the actual goal of the exercise, and: does it have to be so complicated? We address these and other questions in a theoretical overview and by looking at concrete examples. We discuss the trade-offs of different approaches and how various tools and libraries help us to maintain the intended structural integrity.
October 4, 2025 at 2:37 PM
odrotbohm.de
Thu, Oct 9th, 1:50pm – What's new in #SpringModulith? - m.devoxx.com/events/dvbe2... 🍃📦 3/5
What’s new in Spring Modulith? This talk introduces Spring Modulith, a tool for structuring maintainable Spring applications, and reviews its latest features, with a focus on the upcoming 2.0 release. Key enhancements include a new event publication registry, advanced C4 model integration, and major improvements in observability and actuator support.
October 4, 2025 at 2:37 PM
odrotbohm.de
Tue, Oct 7th, 1:30pm – Tactical Domain-Driven Design with #Java and #Spring – m.devoxx.com/events/dvbe2... #DDD ☕️⚗️🍃📦2/5
Tactical Domain-Driven Design with Java and Spring This workshop explores tools and approaches for implementing tactical Domain-Driven Design (DDD) in Java, focusing on the jMolecules library for expressing DDD concepts and the Spring Modulith project for modular Spring Boot applications, including support for integration, events, testing, and documentation of rich domain models.
October 4, 2025 at 2:37 PM
odrotbohm.de
As I am polishing slides for next week's #Devoxx, I found this slide being the common opener for all of my presentations recently. If you're interested in the topic of maintainable software with #Java and #Spring, make sure to check out the sessions below… ☕️🍃🧵 1/5
A chart showing the complexity of software projects (y-axis) in relation to versions released, continuously growing as development moves through the versions. A marker points to the area before the 1.0 release, stating “Most teams focus on that.” Another marker pointing at the much larger area covering four more versions, stating “…while the challenge is actually this.”
October 4, 2025 at 2:37 PM
odrotbohm.de
📢 Another update for the Logical Structure view in #VSCode's Spring Boot Tools. The application node now reveals a customization icon to select the stereotype groups that should be considered. Switch to the pre-release version to play with it. ☕️⚗️ #jMolecules
The Logical Structure view in VSCode's Spring Boot Tooling showing the Spring Modulith application modules of the RESTBucks application. The application node reveals an icon to open up a dialogue to select the stereotype groups that are supposed to be included in the project tree. A screenshot of the stereotype group selection view.
October 2, 2025 at 12:32 PM
odrotbohm.de
Lovely how @dirkmahler.bsky.social showcases rule validation of architecture that is against an intended architecture using #jMolecules for the former and #ContextMapper for the latter. #jsd2025 ☕️⚗️
A presentation slide titled "APPLICATION STRUCTURE" discusses jQAssistant rules that validate against abstract concepts, such as Bounded Context and Technical Aspects. It illustrates relationships between concepts like "Implemented Bounded Context," "Documented Bounded Context," the former bound to jMolecules annotations and the latter described by Context Mapper.
September 26, 2025 at 3:45 PM
odrotbohm.de
Code comments… #JavaForumNord
Coke bottles in a refrigerator. The main one with a “Mate” label.
September 16, 2025 at 10:15 AM
odrotbohm.de
Weekend literature…
The cover of the book “Structured Design” by Edward Yourdon and Larry L. Constantine from 1979.
September 12, 2025 at 11:59 AM
odrotbohm.de
The #STS team is on 🔥! Sneak preview for the #SpringModulith application module information incorporated in the logical structure view in #VSCode. ⚗️🍃📦
Screenshot of a VSCode Logical Structure project explorer that shows a Spring Modulith project's types arranged by application module, whether they're exposed to other modules or internal, followed by the assignment to concepts of Hexagonal Architecture and grouped design and technology stereotypes like DDD, Spring, Jackson, and JPA.
September 4, 2025 at 12:34 PM
odrotbohm.de
Update on the logical project view coming in #STS (flip your #SpringBoot tools to pre-release versions in #VSCode):

- Alphabetic sorting of the stereotypes per level
- Icons! (at least for some of them) 🔥

Up next: #SpringModulith groupings by application module.

⚗️🍃📦 #jMolecules #DDD #Spring
A refined variant of the logical structure view in VSCode displaying application structure based on architectural, design and technology stereotypes in a tree-like structure.
September 3, 2025 at 8:43 AM
odrotbohm.de
Double sneak preview! #jMolecules 2.0 is going to introduce a declarative stereotype concept for predefined ones (DDD, Spring) and custom ones declared in your projects. The #STS team has a prototype to turn that information into a project tree for higher-level project navigation. ☕️⚗️
An image displaying a tree structure of a software application, grouping various components by their architectural stereotype, such as Domain Event Handlers, Aggregate Roots, Services, Entities.
August 29, 2025 at 8:38 AM
odrotbohm.de
Watching my good friend Björn Kerstan grooving percussion alongside Derrick McKenzie for Purple Disco Machine… #PurpleDiscoMachine #Chemnitz2025
A live music performance by Purple Disco Machine is taking place on stage, illuminated by colorful lights. In the background, a large screen displays a sunset with palm trees. The crowd is visible in front of the stage, enjoying the show.
August 15, 2025 at 8:39 PM
odrotbohm.de
The great thing about #GitHub's move to React, and thus being able to partially update the UI, is that you can construct inconsistencies you'd never get with a full-page refresh! *slowclap*
A screenshot extract of the GitHub issues overview after a ticket has been closed showing that the actual criteria is “open tickets”, but the just-closed ticket still appears in the list.
August 12, 2025 at 11:46 AM
odrotbohm.de
The office for this morning…
A Behringer Wing mixing console.
August 9, 2025 at 6:08 AM
odrotbohm.de
That's gonna be a busy #DevoxxBE… 🤩
Screenshot of an email inbox showing three talk proposals accepted for Devoxx Belgium.
August 5, 2025 at 9:31 PM
odrotbohm.de
This is the way.
A street sign indicating the way to the Springweg car park in Utrecht.
July 28, 2025 at 12:28 PM
odrotbohm.de
It haunts you in places you never would’ve expected.
A map displaying Lombok district of Utrecht.
July 28, 2025 at 12:24 PM
odrotbohm.de
From Wuppertal to Dortmund… #madc #streetart
A mostly yellow, orange, red mural by street artist MadC in the city center of Wuppertal. A white, dark red, yellow mural by street artist MadC in Dortmund.
July 23, 2025 at 5:32 PM