Conference Program

Please note:
On this page you will only see the English-language presentations of the conference. You can find all conference sessions, including the German speaking ones, here.

The times given in the conference program of OOP 2023 Digital correspond to Central European Time (CET).

By clicking on "VORTRAG MERKEN" within the lecture descriptions you can arrange your own schedule. You can view your schedule at any time using the icon in the upper right corner.

Thema: Programmiersprachen

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  • Montag
    06.02.
  • Mittwoch
    08.02.
  • Donnerstag
    09.02.
, (Montag, 06.Februar 2023)
10:00 - 17:00
Mo 4
Software Architecture 101 with Spring Boot
Software Architecture 101 with Spring Boot

This highly interactive workshop is all about software architecture - with Spring Boot, the Java microservice framework. Using an example application, we will discuss and try out the following topics in code:

  • REST API design
  • Hexagonal architecture
  • Bean validation
  • Single sign-on with Keycloak
  • Role-based security
  • Optimistic locking with ETags
  • OWASP dependency check
  • Structured JSON Logging
  • Error handling
  • Integration tests with Cucumber
  • Architecture tests with ArchUnit
  • Local deployment with Docker
  • Reverse proxy with NGINX

Please install the following software before the workshop (if not already available):

  • Java 17+
  • Gradle 7.3+
  • Docker 19+
  • git
  • an IDE of your choice (like IntelliJ IDEA)

On Windows, we also highly recommend you install the Windows Subsystem for Linux 2+.

Target Audience: Software Architects, Software Engineers, Java Developers
Prerequisites: Basic knowledge in Java, Interest in software architecture
Level: Advanced

Extended Abstract:
Prerequisites:
This workshop is highly interactive. You will benefit greatly from trying it out for yourself as well.
Please install the following software before the workshop (if not already available):

  • Java 17+
  • Gradle 7.3+
  • Docker 19+
  • git
  • an IDE of your choice (like IntelliJ IDEA)

On Windows, we also highly recommend you install the Windows Subsystem for Linux 2+.

The example application "Chameleon" that will be used in this workshop has been designed as an educational example project for learning the basics of the Spring Boot ecosystem. But project "Chameleon" tries to be more than just a simple "hello world". It has all the needed parts in place to be as close to a "real world" production-ready software as possible.

Project "Chameleon" currently contains the following features:

General

  • Backend with Spring Boot
  • Yaml configuration file
  • Hexagonal architecture
  • Build with Gradle
  • Local deployment with Docker
  • Reverse proxy with NGINX

REST API

  • Definition of RestController with GET, POST, DELETE and PATCH
  • Description of REST API with OpenAPI
  • Swagger UI
  • Dtos
  • Model mapper
  • Bean validation
  • Global error handler
  • Local error handler
  • Request ids
  • Optimistic locking with ETags

Database

  • Storage in relational database with PostgreSQL
  • JPA, JpaRepository (Spring Data)
  • Database migration with Flyway

Security

  • Integration of SSO (single sign-on) with Keycloak
  • Role-based security (JSR250)
  • OWASP dependency check

Logging

  • JSON logging
  • Structured logging
  • Logging of request ids
  • Logging of user and roles

Testing

  • Unit tests with JUnit 5
  • Assertions with Google Truth
  • Architectural unit tests with ArchUnit
  • Coverage report of unit tests with JaCoCo
  • Integration tests with Cucumber

Dr. Christoph Ehlers is the Head of Software Engineering at ConSol. As a project lead, agile coach and software architect, he ensures the successful completion of IT projects. After studying computer science at the University of Passau, where he also earned his doctorate, Christoph Ehlers found his way to ConSol more than seven years ago. He is particularly interested in software architecture and databases. Caution: His enthusiasm for technology is contagious!

Christoph Ehlers
Christoph Ehlers
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, (Mittwoch, 08.Februar 2023)
11:00 - 11:45
Mi 5.2
Cloud Chaos and Microservices Mayhem
Cloud Chaos and Microservices Mayhem

The cloud has fundamentally changed how we design applications and introduced whole new categories of software-development disasters. With a focus on Java, this talk will introduce some of the new tools, patterns, and best practices for modern distributed application development. It also gives a tour of some of the most painful anti-patterns Holly has seen as a cloud consultant.

Target Audience: Architects, Developers, Strategic Decision Makers
Prerequisites: Basic experience of cloud computing, Knowledge of Java
Level: Advanced

Extended Abstract:
The cloud is just someone else's data center, but it has fundamentally changed how we design software and what we expect from our platforms. Our applications have gotten bigger, more distributed, and more complicated, and there are whole new categories of mistakes we can make. Some things that were a good idea ten years ago turn out to be a terrible idea in the cloud; and what used to be ‘good enough’ for testing really isn’t anymore. Managing microservices architecture demands a lot of us, to ensure observability, operational resiliency, and organisational agility. With a focus on Java, this talk will introduce some of the new tools, patterns, and best practices for modern distributed application development. It also gives a tour of some of the most painful anti-patterns Holly has seen as a cloud consultant.

Holly Cummins is a Senior Principal Software Engineer on the Red Hat Quarkus team. Before joining Red Hat, Holly was a long time IBMer, in a range of roles from cloud consultant, full-stack javascript developer, WebSphere Liberty build architect, JVM performance engineer, to innovation leader. Holly is also a Java Champion, author, and regular keynote speaker. You can follow her on twitter at @holly_cummins or at hollycummins.com.

Holly Cummins
Holly Cummins
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18:30 - 20:00
Nmi 3
Coroutines From Scratch
Coroutines From Scratch

You've heard about this new feature in C++20, Coroutines, but it's the first time you have encountered this term? Then this talk is what you're looking for. We start from the beginning with just "normal" functions. Next, we introduce Coroutines. Using them, we explore the various customization points C++ offers. Another distinction we make is cooperative and preemptive multitasking, opening the door for another beauty of Coroutines, why we don't need locks.
By the end of this talk, you've learned what coroutines are and where you can use them.

Target Audience: Developers
Prerequisites: C++ knowledge
Level: Basic

Extended Abstract:
You've heard about this new feature in C++20, Coroutines, but it's the first time you have encountered this term? Then this talk is what you're looking for. We start from the beginning with just "normal" functions. Next, we introduce Coroutines.
Using them, we explore the various customization points C++ offers. We look at what the new keywords co_await, co_yield, and co_return are for.
Sadly, we also have to talk about how to write a generator for a coroutine since there is no STL part for that in C++20.
Another distinction we make is between cooperative and preemptive multitasking, opening the door for another beauty of
Coroutines, why we don't need locks.
By the end of this talk, you've learned what coroutines are and where you can use them.

Andreas Fertig, CEO of Unique Code GmbH, is an experienced trainer and consultant for C++ for standards 11 to 20.
Andreas is involved in the C++ standardization committee, in which the new standards are developed. At international conferences, he presents how code can be written better. He publishes specialist articles, e.g., for iX magazine, and has published several textbooks on C++.
With C++ Insights (https://cppinsights.io), Andreas has created an internationally recognized tool that enables users to look behind the scenes of C++ and thus understand constructs even better.
Before working as a trainer and consultant, he worked for Philips Medizin Systeme GmbH for ten years as a C++ software developer and architect focusing on embedded systems.

Andreas Fertig
Andreas Fertig
Vortrag: Nmi 3
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, (Donnerstag, 09.Februar 2023)
09:00 - 10:45
Do 3.1
Use Testing to Develop Better Software Faster
Use Testing to Develop Better Software Faster

As developers, our job is to deliver working software. With the shift to CI/CD and the move to the cloud, the need to have the right feedback at the right time only increases. There are many ways that testing can help us with that. Not only can testing help us verify our solution and prevent us from breaking things, it can also help us design our software, find flaws in our architecture and come up with better solutions. In this talk I will highlight some of the many ways that testing can help you to develop better software faster.

Target Audience: Developers
Prerequisites: Basic knowledge in Java
Level: Advanced

Extended Abstract:
Testing doesn't always get the attention it deserves in software development. Many developers claim to be bad at it, or are just not that interested. (These may or may not be related.)

As developers, our job is to deliver working software. With the shift to CI/CD and the move to the cloud, the need to have the right feedback at the right time only increases. There are many ways that testing can help us with that. Not only can testing help us verify our solution and prevent us from breaking things, it can also help us design our software, find flaws in our architecture and come up with better solutions.

In this talk I will highlight some of the many ways that testing can help you to develop better software faster.

Marit van Dijk is a software developer with 20 years of experience in different roles and companies. She loves building awesome software with amazing people and has contributed to open source projects like Cucumber and various other projects. She enjoys learning new things, as well as sharing knowledge on programming, test automation, Cucumber/BDD and software engineering. She speaks at international conferences, webinars and podcasts, occasionally writes blog posts and contributed to the book "97 Things Every Java Programmer Should Know" (O’Reilly Media).

Micro-Service Delivery without the Pitfalls
Micro-Service Delivery without the Pitfalls

In this session I’ll examine some of the things that can go wrong when organisations jump headfirst into micro-service architectures without understanding the potential pitfalls.

I'll explain contract testing from the ground up. You'll learn how it can decouple micro-service dependencies during development, allowing your teams to work effectively. And I'll describe sophisticated, free, open-source tooling that helps integrate contract testing into your software lifecycle, giving you the confidence to release micro-services independently.

Target Audience: Architects, Developers, Decision Makers, Release Managers, DevOps
Prerequisites: English, basic software design/architecture, software lifecycle
Level: Advanced

Seb Rose has been a consultant, coach, designer, analyst and developer for over 40 years. He's now Developer Advocate with SmartBear Advantage, promoting better ways of working to the software development community.
Co-author of the BDD Books series "Discovery” and "Formulation" (Leanpub), lead author of “The Cucumber for Java Book” (Pragmatic Programmers), and contributing author to “97 Things Every Programmer Should Know” (O’Reilly).

Marit van Dijk
Seb Rose
Seb Rose
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11:00 - 11:45
Do 7.2
Scale to Zero with Java and Save the Planet (and Money)
Scale to Zero with Java and Save the Planet (and Money)

Java applications are widely used and often several years old. You can use these applications in the cloud via lift-and-shift (helps nothing) or you can rewrite the application in cloud-native style and use the advantages of the cloud.

An alternative for existing applications is missing here. It must be possible to go to the cloud and use advantages such as serverless and scale-to-zero WITHOUT having to rewrite the entire application.
I will show what is already working well today and where the rough edges are.

Target Audience: Architects, Developers
Prerequisites: None
Level: Basic

Additional information:
In the session, we'll move an existing application to the cloud and save over 70 % of operating and maintenance costs with serverless and scale-to-zero.

Richard Fichtner is CEO and Principal Software Architect at XDEV Software GmbH and has worked in the software industry for more than 15 years, often at the interface between business and technology. He is involved in the open-source community to spread knowledge about Java technologies. He speaks at conferences and contributes to various open-source projects such as https://www.rapidclipse.com/. Richard is a leader of the Java User Group Oberpfalz, recognized as Oracle ACE and holds a Master of Science degree in applied computer science. He is passionate about enabling developer productivity and supports teams in the use of cloud solutions. His interests are Java, clean code, cloud, new technologies and everything pragmatic.

Richard Fichtner
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