Case Study Summit for Java Developers
Online March 30-31, Start: 10 AM UTC Duration: 14 hours
10 000+

Registrations expected

Speakers expected

hours of Tech Talks
A Hitchhiker's Tour to Containerizing a Java application
As “the Cloud” becomes more and more widespread, now is a good time to assess how you can containerize your Java application. I assume you’re able to write a a Dockerfile around the generated JAR. However, each time the application’s code will change, the whole image will need to be rebuilt. If you’re deploying to a local Kubernetes cluster environment, this increases that much the length of the feedback loop.

In this demo-based talk, I’ll present different ways to get your Java app in a container: Dockerfile, Jib, and Cloud Native Buildpacks. We will also have a look at what kind of Docker image they generate, how they layer the images, whether those images are compatible with skaffold, etc.
Shelley Lambert
Technical Leader at Eclipse Adoptium (AdoptOpenJDK)
"Dismantling Technical Debt and Hubris"
Dismantling Technical Debt and Hubris
Software development is riddled with people who choose to write their own solutions, even when there are valid existing alternatives. These developers are confident their solution is better. Most times they are wrong. This duplication and unnecessary activity leads to an accumulation of technical debt that is often owned by others. Examples are drawn from 25 years (as old as Java itself) of technical debt and hubris in the software verification space. This is a story about reducing roll-your-own solutions, choosing existing open-source tools and being humble in environments that often favour self-promotion over doing the right thing.
Larry Garfield
Director of Developer Experience
"Building a cloud-friendly application"
Building a cloud-friendly application
Containers are all the rage these days. They’re fast, they make deployment easy, they handle dependencies, they slice, they dice, they make julienne fries! But... what are they? What exactly is a container and how does it work? Just how does a container differ from the “old” silver bullet, virtual machines?

Here’s a hint: It has nothing to do with boats, or whales, or shipping. That’s all marketing fluff.

Containers are simply a shorthand name for leveraging newer features of operating system kernels that let the OS lie to programs about how they’re running. In fact, all of modern software is built on lies. That’s what’s useful about it!

To understand how that works, why it’s so useful, and where it’s not, let’s dive into how software actually works on a modern Linux system to see how those kernel features fit into the big picture, building up to “containers” along the way. Pull back the veil of lies and see how your computer really works.
Berwout de Vries Robles
Java Developer
"Stairway out of dependency hell"
Stairway out of dependency hell
"My team had a lot of products to manage, each in their own git repository.
All of the work involved with just keeping up-to-date was really limiting our progress into more exciting features.
Over a period of two years we’ve introduced a GitOps flow, migrated to a monorepo, built an auto-scaling test environment and started using Kubernetes namespaces for our testing.
In this talk we will look at both the technical solutions and the lessons learned. What worked? What didn’t work? What was worth it? What would we have done differently if we knew better?
The talk is targeted towards Software Developers looking for ways to improve their workflow at the team level but the lessons learned should be relevant in a much broader sense."
Roy Braam
Developer / Architect
"End-to-End test architectures, a dead End road"
End-to-End test architectures, a dead End road
With the rise of Distributed Architecture, independent DevOps teams and automated CI/CD the End-to-End test environments needs to be reconsidered.
They become flaky, shaky, untrustworthy and hard to maintain. Why are End-to-End test environments a dead End road and what are the alternatives.
Why are people still using these so called 'production-like' test environments and how can we achieve the same level of software quality without them.
I will give some ideas on how to solve the testing problems in a different way being less depending on those fragile environments.
After attending this talk I hope people are questioning the end-2-end test environments and have some ideas on how deliver without it.
Cagri Dursun
Senior Software Developer
"Scala vs Java"
Scala vs Java
As all known scala is little brother of Javabut do we all know what scala brings to the table. Which one is easier or which one is useful or complex. With this topic we will talk about pros/cons and will get decided who will win this fight!
Clement Escoffier
Senior Principal Software Engineer
"AHOY! Reactive - The Quarkus Reactive Journey"
AHOY! Reactive - The Quarkus Reactive Journey
Quarkus is a stack to build Cloud-Native applications in Java. Thanks to a novel built-time pipeline, it reduces the startup time and memory consumption of Java applications and offers the ability to compile Java applications into native executables. Also, Quarkus is a reactive framework. Since the incubation of the project, reactive has been a prominent characteristic of Quarkus.

In this talk, we will see the reasons behind making Quarkus reactive. We will cover different use cases for reactive and how reactive has been blended in the framework. We will also present the journey, as it didn't become reactive in one day. We will look at the individual steps, explaining the features provided by each of them and how they are making Quarkus a prominent actor in the reactive landscape.
Ilia Ilin
Senior Software Engineer
"How subjective is your testing approach?"
How subjective is your testing approach?
We all write tests or pretend to do so, from some colleagues we've heard it is a must to have at least 90% coverage to sleep well at night, from others we learn that tests are not that necessary and only slow us down. Some say you need to write tests first, while others advice to write them afterwards. And which tests do you write among those categories: unit, integration, functional acceptance, component, system, contract tests?

I want to talk about all that comparing three different projects I've been working on, demonstrate how 'it depends' and some lessons learned.
Xiang Shen
Solutions Architect
"Optimizing serverless Java applications on Google Cloud"
Optimizing serverless Java applications on Google Cloud
Traditional Java applications tend to be monolithic and long-running. Optimizations that work well for those applications may not work as well on a serverless platform. In this session, we will discuss the unique challenges for Java serverless applications and take you through some optimizations and tradeoffs that you can use to reduce startup time and memory usage.
Igmar Palsenberg
Dev engineer
"Shifting gear, a reactive story in banking"
Shifting gear, a reactive story in banking
When I joined ING, I was new to payments. I quickly learned that payments is a complex beast. Payments are in a lot of cases is based on “old” technologies, since it’s usually one of the oldest service the bank runs. Most banks still run a considerable amount of COBOL code. That by itself poses a set of unique problems, and banks are moving over to modern Java technologies.

I was hired to start the reactive systems car, and quickly shift it into the fifth gear. Being an experience developer and architect with a great team is what really drove me for the past two years. We POC’d a number of reactive technologies and programming languages, to ultimately and up with Akka and Java.

Then we really started on our reactive journey : The initial design with took a month, the scoped target product, the actual development and at the end, the delivery and putting it in production. We had a few setbacks, messed things up, had success stories, and had a lot of lessons on implementing our reactive, scalable payment engine.

I want to share our story with you, and tell your how we did it, and delivered a modern, scalable, resilient system in a traditional world.
Lior Yaffe
"Blockchain Based Online Gaming Server Implemented in Java. A modern approach to interactive game design and token based incentive system."
Blockchain Based Online Gaming Server Implemented in Java. A modern approach to interactive game design and token based incentive system
We will present a new Java based project combining two technologies which are seeing explosive growth in recent years: Blockchain and Online Gaming.
We will present the API design, Scaling Solutions, Decisions we took around cryptography and security as well as the integration of game bots with human players.
Igor Braga
Software Developer
"Demystifying Garbage Collection in Java"
Demystifying Garbage Collection in Java
Do you want to explore and optimize even further your Java application? By having a better understanding of how Garbage Collection manages your application’s memory, you’ll have the power to implement a more optimized Java program. During this talk I will walk you through the Java Garbage Collection (GC) in some detail, how it is performed, why we need it, and how it differs from other memory management systems e.g. C++. Following that, there will be an explanation of the different ways the GC can manage the memory of a Java program, and I’ll be using OpenJ9 GC as an example. After laying out the basics I’ll explain the different policies that the GC contains and compare them to other policies such as G1, ZGC and Shenandoah. To conclude, I will mention an advanced feature of OpenJ9 GC, that is currently being implemented called double mapping arraylets, which is a way to improve the memory management of large arrays in Java in region based GC. This talk will be aimed to anyone with some knowledge of any programming language not just Java, being that basic, intermediate and advanced. The talk starts by covering the basics and gradually transition to more advanced topics.
Buhake Sindi
Senior Full Stack Java Developer
"Dockerizing your development environment"
Dockerizing your development environment
"Developers prefer working on their preferred workstation of choice, with an OS of choice and the most challenging problem working with other developers and developing teams to have projects running consistently across multiple operating systems. Besides creating fully-fledged development environment on a cloud, the benefits of docker is not only for deployment, also for development.
This talk will discuss how we've setup a consistent development environment for all our developers using Docker. We will discuss what has worked, what hasn't worked as well whether it's best to create your development workspace on your own workstation."
Thodoris Bais
Scrum Master / JUG Founder & Leader
"Be The Leader of Your Own Career"
Be The Leader of Your Own Career
Leadership is not about knowing the way; it’s about taking responsibility to find the path. Whether you are formally tasked with leading a team or just want people to trust your judgement, being a true leader will push your career forward and get you onto a path to success. This session will answer your questions and help you become a leader. Learn how to start now, no matter your official position in the company; what the correct leadership skills are; and how to acquire them. Stop feeling adrift. Start leading and forging your own path.
Deepu K Sasidharan
Developer Advocate
"Java Microservices made easy with JHipster, Istio and Kubernetes"
Java Microservices made easy with JHipster, Istio and Kubernetes
JHipster is a widely used, Open Source application generator platform for creating simple Spring Boot web apps and complex micro-services architectures with Spring Cloud, Eureka, Consul, Prometheus, ELK, Docker, Kubernetes, Istio, and much more!

In this session, I'll showcase how to use JHipster to build microservice architectures easily even if you are a junior developer. JHipster does the heavy lifting here with proven architecture models while you can focus on business needs and building your entity model. We will build a fully functional e-commerce microservice application during the session.
Ádám Sándor
Cloud Native Architect
"Automating the Enterprise with Kubernetes Operators"
Automating the Enterprise with Kubernetes Operators
The major challenge during building a GitOps-based CI/CD system used by nearly a hundred teams, was how to automate the provisioning and long term management of the system. We opted to accomplish this by building a set of Kubernetes Operators and use Custom Resource as our API to the rest of the world. We created our Operators using Java, which turned out to be a good choice in a team full of Java developers.
In this talk I will explain the journey we went through and myriad design decisions we had to take to fully automate the management of the CI/CD system. At the same time I will explain how developing Operators using Java was like and what we did to help ourselves and others go down that journey.
Nacho, Cougil
Senior Software Engineer
"The chicken or the egg, which came first? Our experience with XP "
The chicken or the egg, which came first? Our experience with XP
Have you found in your team that your colleagues are building things but you don’t know what are they doing or the reason why? Have you been struggling with some code someone pushed into your module without noticing it? Have you stayed in a team as the only one person who knows about X or Y?

If you have answered yes to any of these questions, then, this talk is for you. We will show you how in Dynatrace, and specifically in our team, we are applying eXtremme Programming (XP) techniques and how they are helping us to mitigate and even solve those kinds of problems.

We have managed to turn it around, and now we are happier at work. We have less bugs, less frictions and at the same time, we know more how to evolve our components as we need. Yes, we have invested more time in analysing or studying things in common but we have increased the knowledge sharing.

It has been (and still is) difficult. For example, we have invested a lot of time (and money) to run sessions of programming in pairs / mob programming and we have been repeatedly asked how that is? Really? More than one person in the same thing? Also, we have had to break down some reluctances and fears, and yes, these are tremendously difficult things to change. Imagine someone who has never practiced TDD, making her/him understand that s/he has to write tests first?

In summary, we will try to show you the advantages (and disadvantages) of applying techniques such as TDD, pair-programming and Continuous Integration and how they helped us to grow not just as better developers, but also as a well-connected and performant team.
Kamila, Oliveira
Backend Developer
"What is the importance of soft skills?"
What is the importance of soft skills?
In this talk we will cover concepts and applications of clean architecture, clean code, when and how to refactor our code and why it is important to write tests, with examples in Java and Spring Boot. I intend to pass on some good development practices that I have been learning and are widely used in the market.
Sergi Baila
Blockchain developer
"Blockchain Java use case. From the inception until having a decentralized network of more than 1.000 Ardor nodes worldwide. "
Blockchain Java use case. From the inception until having a decentralized network of more than 1.000 Ardor nodes worldwide.
Blockchain was a trending topic during the last years. To develop a distributed ledger in Java, you need to have the greatest skills possible, because a single bug might represent the loss of many tokens for your users. But that's not the only challenge: the distributed ledger has to be designed with a business-ready oriented functionality and a user-friendly integration and interface.

Therefore, I will explain what are the basic architecture components, how they are designed and the tools used to make it work like a Swiss clock, Jetty, IntelliJ as IDE, cryptography. Having a network of more than 1.000 nodes up&running worldwide is not a simple task.
Andrew Petryk
Java Engineering Manager
"Javarunner 2024"
Javarunner 2024
There was never a better time to be a Java developer. Micronaut, Quarkus, GraalVM are just some of many. And with new (not so, actually) release cycle Java was pushed to the limits. In less then 1 year we will have our next LTS Java version. Predictions of the future were never very accurate, but we will try our best to predict how Java 23 will look like and what future prepare for us.
Anthony Dahanne
Software Developer
"Java applications containerized and deployed, make your buildpack edition"
Java applications containerized and deployed, make your buildpack edition
Web based IDEs have been around for quite some time now!
They come in all kind of flavors: Open Source (Eclipse Che), Integrated with Github (Codespaces, Gitpod), quick and easy (, focused on cloud (Codenvy), etc.

But are they usable ?
Can they hold the comparison with desktop old timers such as IntelliJ IDEA and Visual Studio Code ?
Is it time to switch ?

Let's find out together during this session !
Patroklos, Papapetrou
Principal Software Engineer
"The top 10+1 essential (soft) skills for every developer"
What is the importance of soft skills?
In this talk we will cover concepts and applications of clean architecture, clean code, when and how to refactor our code and why it is important to write tests, with examples in Java and Spring Boot. I intend to pass on some good development practices that I have been learning and are widely used in the market.
Łukasz Gebel
Senior Software Engineer
"The Storm Trooper Way of Processing Streams"
The Storm Trooper Way of Processing Streams
Processing the unbounded streams of data in a distributed system sounds like a challenge. Fortunately, there is a tool that can make your way easier. Łukasz will share his experience as a "Storm Trooper", a user of Apache Storm framework, announced to be a first streaming engine to break the 1-microsecond latency barrier. His story will start by describing the processing model. He'll tell you how to build your distributed application using spouts, bolts, and topologies. Then he'll move to components that make your apps work in a distributed way. That's the part when three guys: Nimbuses, Supervisors, and Zookeepers join in and help to build a cluster. As a result, he'll be able to show you a demo app, running on Apache Storm. As you know, Storm Troopers are famous for missing targets. Łukasz will sum up the talk by sharing the drawbacks and ideas that he missed when he first met this technology. After the presentation, you can start playing with processing streams or compare your current approach with the Apache Storm model. And who knows, maybe you'll become a Storm Trooper.
Steve Poole
Developer Advocate
"Game Over? - rebooting our thinking about Java in the Cloud"
Game Over? - rebooting our thinking about Java in the Cloud
Developers and security - it’s a lot more than just turning on SSL. In this session we’re going to show how to think differently about designing and coding in Java so that the application is less open to being attacked and (bonus) is often of higher quality. This taster talk will cover 7 types of development thinking that can get your application into trouble. With code examples (of course) we’ll explore a serious of common code pitfalls and explain how to design and code differently. There is much to learn when creating a secure application - take your first steps here.
Antonio Goncalves
"When Quarkus meets MicroProfile"
When Quarkus meets MicroProfile
"You need to develop microservices in Java and you don't know where to start. You need REST endpoints with OpenAPI contracts, you need to exchange asynchronous messages, check the health of the entire systems, gather metrics, all that in a resilient way, compiled with GraalVM and packaged with Docker. Where do you start?

What about MicroProfile? And what about Quarkus as the runtime?

This talk uses a little amount of slides and a all lot of code. I will start by presenting Quarkus and MicroProfile to then dive into developing a few microservices interacting with each other through REST calls and Kafka topics.

Join me in this hands-on talk"
Dieter Jordens
Software & Data Engineer
"Enhancing Page Visits by Topic Prediction"
Enhancing Page Visits by Topic Prediction
Everyone knows it's important to stay relevant in a rapid changing world. In software craftsmanship, it's important to continously work toward your goal. Things aren't always easy or straightforward. In my talk I will take you along my journey of a software craftsman and how you can take your career into your own hands. I'll show you how books, courses, blogs and a healthy lifestyle are an important part of my career (and how I find the time for all that). I'll show you my most recent pet project, an exciting Deep Learning project, that is part of my journey of transforming data into value for a living.
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Entry-level track
Gives access to Junior track only with no recordings.
Focuses on entry-level content around Java developing..
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Live stream for both tracks
Q&A panel participation
Recordings of both tracks
Slack membership
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Gives access to both Junior and Senior tracks, recordings are included.
Focuses on deep tech content around Java developing.

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Call for papers
Rafael Chinelato Del Nero
Senior Software Engineer
Alex Soto
Java Champion, Director
of Developer Experience
Michal Matloka
Architect, Consultant,
Speaker & Trainer
Ana-Maria Mihalceanu
Solutions Architec
Andrew Fok
Software Engineer
Bazlur Rahman
Sr. Developer
Thodoris Bais
Scrum Master
Pavel Kurilyuk
Java Developer
Edwin Derks
Software Architect
Orkhan Gasimov
Digital Architect, Senior Consultant
Mary Grygleski
Developer Advocate
Otavio Santana
Developer Relations Engineer
Thodoris Bais
Scrum Master
Pavel Kurilyuk
Java Developer
Edwin Derks
Software Architect
Orkhan Gasimov
Digital Architect, Senior Consultant
Mary Grygleski
Developer Advocate
Otavio Santana
Developer Relations Engineer
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While offline events are temporarily gone, Geekle never stops! We are running the Case studies summit for Java Developers on February 2, 2021. Our speakers are leading experts from top companies all over the world who are ready to share what challenges Java developers face in their work.
Geekle has the unique experience to gather huge tech summits with 11'000+ attendees in different tech domains. We hope to create something the world has never seen before for the World Java Community!
See you all!
Geekle Corp.
910 Foulk Road, Suite 201
Wilmington, DE
19803, USA

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