What we’re about
Java & JVM in Vienna, Austria: An in-person meetup for local enthusiasts.
Our monthly meetup (except for July and August) in Vienna provides a platform to discuss various Java-related topics such as frameworks and best practices. The meetup is aimed at beginners, intermediates, and professionals alike.
Please note that our meetings are in-person only and primarily intended for individuals living in or near Vienna.
We meet at the Vienna University of Technology in the heart of the city. If you have something interesting to share that is not widely known, please feel free to reach out to one of the organizers.
Java & JVM in Wien, Österreich: Ein persönliches Meetup für lokale Enthusiasten.
Unser monatliches Meetup (ausgenommen Juli und August) in Wien bietet eine Plattform, um über verschiedene Java-bezogene Themen wie Frameworks und bewährte Methoden zu diskutieren.
Das Meetup richtet sich an Anfänger, Fortgeschrittene und Profis gleichermaßen.
Bitte beachtet, dass unsere Treffen ausschließlich "in-person" stattfinden und hauptsächlich für Personen gedacht sind, die in Wien oder der näheren Umgebung leben.
Wir treffen uns an der Technischen Universität Wien im Herzen der Stadt.
Wenn ihr etwas Interessantes zu teilen habt, das noch nicht allgemein bekannt ist, zögert nicht, einen der Organisatoren zu kontaktieren.
Sponsors
See all
TU WienDie TU stellt uns ihre Räumlichkeiten für unsere Meetups zur Verfügung!
JetBrainsLicenses for JetBrains products to raffle at our meetings.
dynatraceTalks & Benefits ;-)
BitpandaTech talks & Food+Drinks
PosedioTech-Talks & 🍻Support
greyflower media GmbHTime & Material- TU WienDie TU stellt uns ihre Räumlichkeiten für unsere Meetups zur Verfügung!
- JetBrainsLicenses for JetBrains products to raffle at our meetings.
- dynatraceTalks & Benefits ;-)
- BitpandaTech talks & Food+Drinks
Upcoming events (4+)
See all- "Truffle Meta Compilation in Action" + "Exploring JVM Memory Management"TU Wien, Freihaus HS1, Vienna
Agenda
18:00 doors open
18:20 welcome
18:30 Truffle Metacompilation in Action - Christian Humer
19:30 break
19:55 raffle
20:00 Trash Talk - Exploring the JVM memory management - Gerrit Grünwald
21:15 NetworkingTruffle Metacompilation in Action
Ever dreamed of creating your own programming language, but worried it might be too slow or complicated? Worry no more! In this talk, we'll discover how to build high-performance programming languages for GraalVM — by simply writing an interpreter in Java.We'll demystify the magic behind Futamura projections and metacompilation, proving that the days of manually writing complex compilers are behind us. Once we've covered the essentials, we'll dive into building our very own high-performance toy language. You'll see how it can compete with industry-leading engines like V8 and HotSpot.
And if the demo gods smile upon us, we'll even extend our language to the point where we can step through our very own language's code in a debugger.
Join me for this fun hands-on experience!About the Speaker
Christian Humer is a principal engineer and researcher at Oracle Labs in Zurich. He leads the Truffle framework, which powers high-performance implementations of languages like JavaScript, Python, and Ruby on GraalVM. With a background in virtual machines and programming language runtimes, he has contributed to several advancements in the field of language implementation.Trash Talk - Exploring the JVM memory management
In the realm of Java programming, understanding memory management and garbage collection mechanisms cannot only be helpful for optimizing performance and resource utilization but also in general will help you to use the right garbage collector for your application. This session will be about memory allocation, object lifecycle, and garbage collection strategies within the Java Virtual Machine (JVM). Attendees will gain insights into memory allocation strategies, object retention policies, and various garbage collection algorithms like generational and concurrent collection. So when you are interested in getting more knowledge about which garbage collector to use best for your application or about memory management in the JVM, this session is for you.About the Speaker
Gerrit Grunwald is a software engineer that loves coding for around 40 years already. He is a true believer in open source and has participated in popular projects like JFXtras.org as well as his own projects (TilesFX, Medusa, Enzo, SteelSeries Swing, SteelSeries Canvas, JDKMon).Gerrit blogs regularly at http://harmonic-code.org, he is an active member of the Java community, where he founded and leads the Java User Group Münster (Germany), he is a JavaOne rockstar and a Java Champion. He is a speaker at conferences and user groups internationally and writes for several magazines.
- "Engineering a better Java build tool" + "Vaadin 24 in the real world"Needs location
Joint Meetup with Scala Vienna
Agenda:
18:00 doors open
18:20 organizational stuff
18:30 - 19:30 Mill: Untapped Potential in the Java Build Tool Experience - Li Haoyi
19:30 - 19:55 Pizza break
19:55 - 20:00 Raffle
20:00 - 21:00 Vaadin 24 in the real world - building the Java Vienna Raffle! - Sebastian KühnauUntapped Potential in the Java Build Tool Experience
The Java language is known to be fast, safe, and easy, but Java build tools like Maven or Gradle sometimes don't quite live up to that standard. This talk will explore what "could be": where current Java build tools fall behind modern build tools in other communities, in performance, extensibility, and ease of getting started. We will end with a demonstration of an experimental build tool "Mill" that makes use of these ideas, proving out the idea that Java build tooling has the potential to be much faster, safer, and easier than it is today.About the Speaker
Li Haoyi graduated from MIT with a degree in Computer Science and Engineering, and since then has been a major contributor to the open source community. His projects have over 10,000 stars on Github, and are downloaded over 20,000,000 times a month. Haoyi professionally built distributed backend systems, programming languages, high-performance web applications, and much more.Vaadin 24 in the real world - building the Java Vienna Raffle
TBAAbout the Speaker
Sebastian Kühnau ist seit zwei Jahrzehnten Java-Junkie und schon während seines Studiums Vaadin verfallen. Seit 2016 arbeitet er in verschiedenen Tech-Rollen bei Vaadin und unterstützt Kunden, maßgeschneiderte Webanwendungen zu entwickeln. Nebenher ist er zudem auf verschiedenen Events in und mit der Community aktiv. - "OpenRewrite in a Nutshell" + "how John started to like TDD (w/ spring boot)"Needs location
save the date!
Agenda:
18:00 doors open
18:20 welcome
18:30 OpenRewrite in a Nutshell: Scaling Upgrades with Practical Insights - Simon Gartner
19:30 break + networking
19:55 raffle
20:00 how John started to like TDD (instead of hating it) - Nacho Cougil
21:15 networkingOpenRewrite in a Nutshell: Scaling Upgrades with Practical Insights
Schnelle Upgrades, einfache Rezepte:- Was ist OpenRewrite? Kurz & knackig.
- Rezepte anwenden: Composite Recipes, dryRun vs. run
- Tech-Upgrades: Wenig Downtime, klare Nachvollziehbarkeit (z.B. EAP-8)
- Lesende Rezepte: Code-Analyse leicht gemacht
- Rezepte schreiben: LSTs, Visitors, Praxisbeispiel
- Rezepte wiederverwenden: EAP-8, Quarkus, Spring Microservices
Ideal für effiziente, transparente Software-Upgrades.
About the Speaker:
Simon Gartner - Softwareentwickler @ Gepardec IT Services GmbH.
Simon ist Softwareentwickler mit viel Erfahrung mit Legacy-Code. Er beschäftigt sich in seinen Projekten intensiv mit der Anwendung von OpenRewrite in der Praxis. Sein Fokus liegt bei der automatisierten und reproduzierbaren Durchführung von Migrationen. Simon konnte mehrere Modernisierungsprojekte, wie Frameworkupgrades, effizient und innovativ meisten.how John started to like TDD (instead of hating it)
Let me share a story about how John (a developer like any other) started to understand (and enjoy) writing Tests before the Production code.We've all felt an inevitable "tedium" when writing tests, haven't we? If it's boring, if it's complicated or unnecessary? Isn't it? John thought so too, and, as much as he had heard about writing tests before production code, he had never managed to put it into practice, and even when he had tried, John had become even more frustrated at not understanding how to put it into practice outside of a few examples katas 🤷♂️
Listen to this story in which I will explain how John went from not understanding Test Driven Development (TDD) to being passionate about it... so much that now he doesn't want to work any other way 😅 ! He must have found some benefits in practising it, right? He says he has more advantages than working in any other way (e.g., you'll find defects earlier, you'll have a faster feedback loop or your code will be easier to refactor), but I'd better explain it to you in the session, right? Ah! And if you think everything will be theoretical, no! Get ready to see code examples with Spring Boot.
PS: Think of John as a random person, as if he was even the speaker of this talk 😉 !
About the Speaker
Nacho Cougil is a software engineer from Barcelona, fan of TDD and XP practices. He has been working with Java and other web technologies before the effect 2000 and had experience in different roles in the IT world now working at Dynatrace writing code to monitor applications. You may probably meet him before as founder of the Barcelona Java Users Group & the Java & JVM Barcelona Conference ( JBCNConf ). He enjoys spending time with his family, playing sports & improving his eXtreme Programming skills.
Nacho is the founder of the Barcelona Java User Group and a Java Champion.
