2000 - 2018

Java User Group München

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sponsored by 2:team new media GmbH



mgm technology partners - Frankfurter Ring 105a - D-80807 München - 3. OG - 19:00 Uhr

Nächste Meetings:


A Craftsman’s Guide to Designing a Clean Architecture


Marcus Biel


In 2018, it seems like Microservices are the de facto standard for a system architecture, but do they really live up to the hype?

The talk will show you an alternative approach - how we can tame complexity with the help of a clean, monolithic architecture that is modular to the core. Java has been deliberately built from the ground up on a modular basis: Methods, classes, packages. Additionally, the module system was introduced in Java 9. Modularity is based on the fundamental concepts of high cohesion and low coupling. We will look at these concepts, as well as some further measures, in detail. We'll check out what they are, how they are related to one another, and what the best practices are for applying them on all levels of the architecture.

The talk will show you how you can apply these basic concepts to develop a clean, monolithic architecture, based on Java 9 modules and the hexagonal architecture pattern. Finally, we'll learn how to achieve a clean microservice architecture based on a modular architecture.


Marcus Biel (@MarcusBiel) is a Software Craftsman, a Clean Code Evangelist and Java influencer. Since 2001, Marcus has worked as a developer and architect on many different Java related projects, mostly in the finance and telecommunications industries. Right now he is working on https://cleancodeacademy.com/, an online platform dedicated to teaching aspiring Java Craftsmen.




Bridging the Divide between Architecture and Code


Chris Chedgey


Static diagrams on wikis and white-boards might capture the vision of architects, but they don’t much help programmers to understand how the code they’re working on right now fits into the architecture. Nor are the programmers warned when they violate the diagrams as they forge changes, line-by-line. This is a huge problem – it is ultimately individual lines of code that make or break an architecture; and we know that a clean architecture will help teams develop a more flexible product, with less complexity, less wasted effort, etc. Worse, without practical architectural guidance, programmers wrestle with invisible structures that emerge from thousands of inter-dependent lines of code. And being invisible, these structures become ever more complex, coupled, and tangled. In fact, uncontrolled structure actively fights against productive development. This talk shows how to rein in emergent code-base structures and gradually transform them into a cogent, defined architecture. You will see how… • Visualizing the emergent structure makes a code-base easier to understand.
• Restructuring to remove tangles and reduce coupling makes the visualized code-base easier to work on.
• Specifying layering and dependency rules converts good structure into a controlled architecture that guides the team as the code-base evolves and grows. A key ingredient is a live visualization, inside the IDE, of the detailed code the programmer is working on, in the context of the overall architecture. In short, you will learn how bridging the architect/programmer divide can convert code-base structure from liability into an asset that actively works for development productivity.

The presenter, Chris Chedgey, is co-founder, product designer, and developer at Structure101 - a team dedicated to creating techniques and technology for transforming and controlling the structure of large evolving code-bases. During a career spanning 30 years, Chris also worked on large military and aerospace systems in Europe and Canada, including the International Space Station. He has spoken at many user groups and conferences including Oredev, JavaOne, JAX, Javaland, 33rd Degree, JFocus, and Devoxx.


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Am 12.07.2012 fand mit ca. 40 Teilnehmern das Gründungstreffen der Softwerkskammer München statt. Link siehe unten.

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