Java

Liebe JUG-Mitglieder, wir möchten Euch herzlich zu unserem nächsten Stammtisch, der jeden ersten Dienstag im Monat stattfindet, einladen. Alles weitere kann im unserem Blog unter http://www.jug-berlin-brandenburg.de/ gefunden werden. Viele Grüße Sandra, Jan, Jörg und Oliver

Bachata (the dance of our generation) is a social couple dance like Salsa - no choreography. The community in Berlin is active daily - you will meet a lot of open-minded people and make new friends quickly! Every Tuesday we have Bachata dance classes in Berlin - we are usually a group of around 20 people (95% beginners): 🕖 19:00 class: Beginners-+ Bachata Technique (0-1+ years experience) • No partner needed - we switch (for couples: partner rotation is optional). • You can start from zero in any of these classes! 📍 Adress: Jakob-Mierscheid-Steg ([Google Maps Link](https://maps.app.goo.gl/pjXopSSqAt55FQGW9)) - near S+U Hauptbahnhof We are down by the river. • Price: 12€ per class (10er-card = 100€). ✅ Dance teacher contact: [WhatsApp-group](https://chat.whatsapp.com/IWKPsid0cBDAUHCWKZNL2B) / [Instagram](https://instagram.com/mahir.bachata.berlin) 🇩🇪: Bachata (der Tanz unserer Generation) ist ein sozialer Paartanz wie Salsa - keine Choreographie. Die Bachata-Szene in Berlin ist groß und täglich aktiv - du wirst schnell viele offene Leute kennenlernen und neue Freundschaften schließen! Jeden Dienstag findet dieser Bachata Tanzkurs statt - wir sind meistens eine Gruppe von 20+ Leuten (95% Anfänger): 🕖 19 Uhr Kurs: Anfänger-+ Bachata Technik (0-1+ Jahre Erfahrung) • Kein Partner nötig - wir wechseln (für Paare ist der Partner-Wechsel optional). • Du kannst in diesen Kursen jederzeit von null starten! 📍 Adresse: Jakob-Mierscheid-Steg ([Google Maps Link](https://maps.app.goo.gl/pjXopSSqAt55FQGW9)) - Nähe S+U Hauptbahnhof Wir sind unten am Wasser. • Preis: 12€ je Kurs (10er-Karte = 100€). ✅ Tanzlehrer Kontakt: [WhatsApp-Gruppe](https://chat.whatsapp.com/IWKPsid0cBDAUHCWKZNL2B) / [Instagram](https://instagram.com/mahir.bachata.berlin) Schreib uns gerne eine Nachricht, wenn du offene Fragen hast! Wir freuen uns auf dich ❤ Bachata Classes Berlin

For the June edition of our collaborative modeling meetup, we’ll continue the EventStorming deep dive we started earlier this year and explore some of the tactics and recipes of this format. What does that mean, exactly? Massive learning, massive fun, and massive numbers of sticky notes. As always, everyone is welcome. You don't need to be a software engineer to participate. In fact, it would be great to have more people who aren't software engineers. We're here to solve problems cross-functionally, not get into implementation details. As long as you care passionately about getting things right, then you belong here! This is a hands-on workshop. Be prepared to participate fully and add to the energy of the room. Looking forward to seeing you there!

The state deals with a lot of money. People and organisations need to declare, file, and pay taxes or receive returns if they overpaid the state. Tax contributions amount to billions of euros, funding public goods such as infrastructure, education, social welfare, and defence. In the 13th edition of our meetup series, we take a closer look at research and design in public finance and taxation, exploring diverse perspectives from 3 speakers. The evening aims to spark a discussion about the government’s or the state’s role, and how it can be accommodating to citizens, residents, and business owners. We will hear from: * Manuel Großmann (Taxfix) * Merici Vinton (formerly US Digital Service) * Sonja Wilczek (DigitalService des Bundes) The federal government’s DigitalService is hosting the meetup on the mezzanine floor of its Kreuzberg office. All presentations will be given in English. Questions in the later discussion part can be raised in either English or German. The event is jointly organised and hosted by CityLAB Berlin and DigitalService.

**Combining a variety of TopRock break dance moves in the format of HIIT training, this class will be like no other you have taken! Specifically created with non-break dancers in mind, this class is fun, engaging and totally beginner friendly!** 🤸‍♀️ *What exactly is TopRock you might be asking?* Toprock is the **standup part of breakdance**. When break-dancers are showing their skills, they will often start with toprock. Beginners often find toprock to be easier than other elements of [breaking](http://%5Bhttps//www.mygrooveguide.com/dance-info/breaking/what-is-breaking%5D(https://www.mygrooveguide.com/dance-info/breaking/what-is-breaking) "breaking"), because it is done standing up. So this will be a great introduction to breaking for beginners or those wishing to expand their breakdance skills. **Taught by 3x Breakdance World Champion and Choreographer of Flying Dreams show at Wintergarten, Bboy Lou.Ease of the Flying Steps! He has also worked with contemporary dance companies such as Akram Khan Company, Wang Ramirez and Constanza Marcras / Dorkypark.** **📋 Agenda:** * *Check in will begin 15 minutes prior to class*. Please arrive on time to ensure class starts at the designated time. **💸 Cost**: *Donation of 5 euros or more* **to help with maintaining the venue and group maintenance costs.** **👉 Other Things to Note:** * *Class will be in English/German* * *Please make sure to wear comfortable clothes you can move and sweat in. Shoes should also be comfortable, although they are not mandatory. Feel free to dance barefoot or in socks if you like.* * *Bring a water bottle to refresh between sequence breaks.* * *Changing room and toilets provided on site free of charge.* * ***If you RSVP and are unable to make it, please be considerate and cancel 24 hours in advance to make space for someone else.***

​This meetup is a social coding jam where we use AI to quickly turn fun ideas into functional apps. Whether you're an experienced developer or have never written a line of code, you'll fit right in. There will be **free alcohol, soft drinks, and snacks** for all attendees! This time we're teaming up with our friends at [Softr](https://www.softr.io/). Bring an idea or just curiosity, and we'll team you up, point you at Softr's AI-powered, no-code builder, and you'll leave with a working app — or whatever else you dream up. ​A few flavours of **what folks might build on the night**: * ​Turn a messy spreadsheet into a real, login-protected app * ​Build the internal tool to automate the boring part of your job * ​Spin up a portal for your community, side project, or weirdest idea [Softr](https://www.softr.io/) is an AI app builder that turns your ideas into real business apps — client portals, internal tools, dashboards — complete with login, permissions, live data, and workflow automation. ​**Format 🛠️** ​We'll be teaming up in small groups of 3-4 people. We'll provide a few starter prompts to get you going, and then it's heads-down building with your teammates. The goal is to vibe, learn from each other, and walk out with something working. ​**New to vibe coding? ✨** ​No worries. We'll provide simple starter ideas, example prompts, and tool suggestions so even total beginners can dive in without stress. ​**Schedule 🕒** ​(Doors open early so we can settle in. Aim to arrive by 18:20 so we can kick off on time.) ​18:30 — Welcome ​18:40 — Intro from the Softr team ​18:55 — Challenge brief & team formation 🤝 ​19:00 — Round 1: Build 💻 ​19:45 — Break (snacks, drinks, swap ideas) 🥕 ​20:00 — Round 2: Keep building 🏗️ ​20:30 — Optional demos (show what you made!) 📺 ​20:50 — Hang out, network, make friends ☀️ ​21:00 — Close ​**Who is it for?** ​Anyone! Curious coders, tinkerers, designers, founders, AI-curious folks, and developers. If you've ever wanted to turn an idea into a working app without writing code, you belong here. ​**What to bring** ​- Laptop 💻 \- Vibes ⚡ ​**Location 📍** [Rhabarber, Berlin](https://maps.app.goo.gl/ZZBbscwoey7ZszRn6) ​🌟 No pressure, no gatekeeping. Just good people, fun ideas, and some fast-paced collaborative building.

-DROP IN - *(English below)* **Lindy Hop \| Swing Dance Unterricht** Klassen (fast jeden) Dienstag Abend 18.15 Uhr Starter 19.30 Uhr Improver / Refresher Bitte für weitere Informationen & Kosten, bitte hier schauen: [SWING PATROL FRANKFURTER ALLEE - FRIEDRICHSHAIN](https://www.swingpatrolberlin.com/friedrichshain-1.html) \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Classes (almost) every Tuesday 18.15 Starter 19.30 Improver / Refresher All information here: [SWING PATROL FRANKFURTER ALLEE - FRIEDRICHSHAIN](https://www.swingpatrolberlin.com/friedrichshain-1.html)

**⚠️ IMPORTANT: REGISTRATION MANDATORY ⚠️** Registration on **Luma** is **REQUIRED** to attend this event. **Link: https://luma.com/7zfk3orp?utm_source=meetup** Your registration is subject to host approval. You must complete the registration process on lu.ma to receive the full event location details and confirmation of your attendance. **Please note: Without approved registration on Luma, you will NOT be able to access the event location or attend.** We are excited to host a **BLISS x juna.ai workshop** featuring **Dr. Nima Siboni (senior RL Engineer)**, who will guide us through an interactive session on algorithm discovery with LLMs. **​​​ Title: The Heuristic Scientist: Open-Ended Algorithm Discovery with LLMs** **📅 Date: 03.06.2026** **🕕 Time: 18:00** 📍 Location: TU Berlin Marchstrasse 23 [Room 0.011] ​​​The session will last around 2 hours, followed by a networking session with juna.ai and fellow AI enthusiasts (and free pizza!🍕). Bring your laptop! **​Abstract:** Large language models are increasingly useful not only for writing code, but for exploring the space of possible algorithms. In this hands-on workshop, we will look at how LLMs can act as “heuristic scientists”: generating candidate strategies, turning ideas into executable code, testing them against concrete objectives, and refining them through feedback. The workshop centers on the general discovery loop behind LLM-assisted heuristic generation. Participants will learn how to structure problems for algorithm discovery, prompt models to propose interpretable heuristics, evaluate those heuristics with simulations or benchmarks, and use the results to guide further search. We will also discuss when simple prompting is enough, when training or fine-tuning may help, and how to keep generated heuristics understandable, testable, and auditable. ​By the end of the session, participants will have built a small discovery loop of their own and will understand the practical trade-offs involved in using LLMs for open-ended algorithm discovery: creativity versus control, exploration versus verification, and automation versus human judgment. ​ **⚡ FINAL REMINDER ⚡** **You MUST register and be approved on Luma to attend. The event location will only be visible after your registration is confirmed by the host. Link: https://luma.com/7zfk3orp?utm_source=meetup** *** We are **BLISS e.V.**, Berlin’s AI community connecting like-minded individuals passionate about machine learning and data science. Our **BLISS Workshops** connect **students and young professionals with industry partners**, offering an inside look into **how machine learning is applied in real-world settings** \- from research and development to deployment\. ​ ​​​BLISS Website:[ https://bliss.berlin](https://bliss.berlin/?utm_source=luma) ​​​BLISS Youtube:[ https://www.youtube.com/@bliss.ev.berlin](https://www.youtube.com/@bliss.ev.berlin?utm_source=luma)

A space for working on projects & learning new stuff together. 💻☕️ Please RSVP if you intend to join, as we have limited space. 😊

**⭐ DOORS OPEN AT 19:30. PLEASE ARRIVE BEFORE 8PM! ⭐** The Creative Code Stammtisch is a casual show-and-tell for artists, makers, designers, coders, performers, learners and anyone interested in the use of computing skills for artistic expression. The event is free and open to all, regardless of age, origin, gender or experience. Beginners and first-timers should feel especially welcome! You don't have to be a coder yourself 😃 HOW TO FIND US? Find Prachtsaal Studio by crossing the courtyard next to Cafe Augusta on Jonasstr. 22, 12053 Berlin. WHAT SHOULD I EXPECT? We start with quick introductions, then open the floor to anyone who wants to present something. There are usually around six 10-minute slots available, plus time for questions from the audience. First-timers are encouraged to share their work. Topics range from net art to computational design and interactive installations all the way to wearable electronics or generative poetry. If you’re wondering whether your own project might fit, take a look at the [Stammtisch archive](https://creativecodeberlin.github.io/Stammtisch/) to see what others have shared in the past. This event is *not* just for coders! New-media artists and anyone working with technology in their art are very welcome to share. If you enjoy art and/or technology, you’ll likely have a great time, and maybe even learn something new! BEGINNERS WELCOME! If you’re new to creative coding, you can find beginner-friendly resources at [creativecode.berlin/learn](https://creativecode.berlin/learn). THIS IS YOUR SPACE We do our best to create a welcoming environment for all people regardless of race, ethnicity, color, religion, gender identity, sexual orientation, national origin, age, disability, or genetics. People from group generally underrepresented in open-source, art, and technology fields are warmly encouraged to come by. And if you know someone who might enjoy this meetup but isn’t sure it’s for them, let them know they’ll be welcome! SAFE SPACE POLICY We support the Berlin Code of Conduct: [berlincodeofconduct.org](http://berlincodeofconduct.org/) Please read and make sure you agree with its content. ACCESSIBILITY Prachtsaal Studio is located on an easy to access ground floor. We're very sorry to say that the bathrooms are not wheelchair accessible yet. DO I NEED TO SPEAK GERMAN? We speak mostly English so international guests are more than welcome! Our team also speaks French, Italian, Spanish, Dutch, Finnish and German... though language availability may vary depending on which organizers are present :) CONTACT Raphaël de Courville team@creativecode.berlin +49 (0) 176 70070572 or get in touch via [creativecode.berlin](https://creativecode.berlin/) *** The featured artwork of the month is by [aBe](https://hamoid.com). We'd love to feature your work on the cover for the next Stammtisch! Please send an image at team@creativecode.berlin

Probieren Sie mit uns die japanische Kalligrafie aus! Alles Notwendige steht bereit, kommen Sie einfach und genießen Sie. Die Tradition der Kalligrafie wurde erstmals im 6. Jahrhundert von China nach Japan gebracht. Der Stil und die Technik, die in Japan einzigartig sind, haben sich später herausgebildet und wurden von den Samurai, dem Adel und der breiten Öffentlichkeit praktiziert. Wir üben verschiedene Arten von Kanji und versuchen, sie in künstliche Werke umzusetzen, die Sie natürlich auch mit nach Hause nehmen können. Ich hoffe, Sie haben Spaß und entdecken neue japanische Kunst! Try out Japanese calligraphy with us! Everything you need is ready, just come and enjoy. The tradition of calligraphy was first brought to Japan from China in the 6th century. The style and technique, unique to Japan, later evolved and was practiced by the samurai, the nobility and the general public. We will practice different types of kanji and try to transform them into artistic works, which you can of course take home with you. I hope you have fun and discover new Japanese art! 書道のワークショップを開催します。 皆さんと楽しく練習して、最後には作品が作れればと思っています。 道具もすべてこちらで準備していますのでぜひご参加ください！

Riverty Tech Night in collaboration with KI Park and cloud ahead Most of what we've built over the last \~15–20 years assumes a static frame of reference: Apps talk to services over APIs. You know who's calling what, you can stick a gateway in front of it, apply some policy, and move on. Agents don't really fit that model. They don't just call an API and return. They decide what to do, call a tool, look at the result, call something else, maybe involve another agent, loop through an LLM a few times… all the while, doing onbehalf of the user, with permissions that aren't always obvious. It's not always clear who is actually doing something. It's not obvious what the full execution path looks like. And the access control models we're used to — user → service, service → service fall part. We'll dig into what actually breaks when you start wiring agents into real systems, especially around identity and access control. Things like: \- how \(or if\) you assign identity to an agent \- what it means for an agent to act "on behalf of" someone \- how you enforce policy when the flow isn't predefined \- and how you get any kind of visibility into what just happened We'll also look at some of the patterns starting to emerge: agents talking to other agents, tools being invoked dynamically, and why a mediation layer (ie, agentgateway) must be built from the ground up with this in mind. \-\-\-\-\-\- Speaker \-\-\-\-\-\- Christian Posta ([Solo.io](http://solo.io/)) Christian is a globally recognized expert in cloud-native architecture, service mesh, and distributed systems. As Global Field CTO at [Solo.io,](http://solo.io,/) he works with enterprises to design and implement next-generation platforms—and is now at the forefront of AI-native infrastructure and agent systems. \-\-\-\-\-\- Who should attend? \-\-\-\-\-\- This meetup is for people who are building or thinking about the next generation of enterprise systems: Platform engineers and architects, Cloud-native practitioners, AI engineers working with agents and LLMs, Anyone exploring how AI changes system design \-\-\-\-\-\- How to join \-\-\-\-\-\-\- This time, the meetup will be in the premises of Riverty in Kantstrasse 17, Berlin (4th Floor of Living Berlin mall). Riverty will provide pizza and drinks. Please bring your ID as you will need to sign an NDA (we are a regulated entity).

**18:00!** Join us for chill outdoor beach volley! 🏐 ☀️ 🏖️ 🍻 This event is for everyone who enjoys chill games and is not a *complete* beginner (A1.5+). We play 3v3 (or 4v4) with beach rules. There are no trainers at this event. Register via [the simultaneous event](https://www.meetup.com/berlin-volley/events/) for higher-level 2v2 matches (F1+). After playing, you can join us for socials with drinks and snacks at the bar area. We often play a social deduction game, which you're also welcome to join. It's recommended that you come 10 minutes early so you have time to change and find the fields. If it is your first time, 15 minutes might be even better. You can join whatever court you like and move between courts during the event. We self-organize, so once you finish a game, you can start a rematch, mix with another court, or take a break as you see fit. Upon arrival, join the warmup happening on one of the courts. Join our WhatsApp community via [https://volley.berlin/61](https://volley.berlin/61) Follow us on Insta at [https://www.instagram.com/berlinvolleyball](https://www.instagram.com/berlinvolleyball) **Rules**: Do not join if you have an infectious disease. **Venue**: We play at [Beach 61](https://beach61.de/). There are toilets and showers, but no lockers. There is a bar that sells drinks and snacks. **Payment**: You pay in advance via Meetup. Payment via PayPal or Urban Sports Club is not possible. **Refunds**: The venue does not provide refunds. Thus, we cannot refund you either, even in cases where the event is canceled due to bad weather. If you know you can't make it in advance, you can try selling your spot to someone else via WhatsApp or the comment section. You get a full refund if the event gets canceled due to poor attendance. Pictures might be taken and shared publicly, such as on Meetup or Instagram. You can opt out by letting the organizer know you do not wish to be photographed. By RSVP'ing to this event, you acknowledge and agree to the following: Participation in this volleyball event is at your own risk. The organizer is not responsible for any injury, loss, or damage sustained during the event, whether caused by negligence or otherwise. You are aware of the inherent risks involved in park volleyball and voluntarily assume these risks. You agree to hold the organizer harmless from any claims, liabilities, or expenses arising from your participation, including any medical costs. Share anonymous feedback with the organizer via [https://www.admonymous.co/entropy](https://www.admonymous.co/entropy)

The Language Café is primarily aimed at people who are struggling with their mental health which can make it hard to go to regular courses. We want to create a safe space for everyone to learn and practise without pressure. Everyone is welcome! Please try to be on time so we can all get started together :) We mainly practise on a beginner/lower intermediate level and adapt to everyone's prior level of German. The Language Café will focus on teaching you the most important words and phrases and basic grammar in German. The content of the course is adapted to real life. (everyday life in Germany, dealing with authorities, etc.) We will cover different topics every week and you can join us anytime, since the topics do not necessarily build on each other. The Sprachcafé is for free. \*If you cannot make it please cancel your participation so someone else from the waiting list can join, thank you!\* \| \| \| \|

**Latest Dojo Location!** **Knotty Pine Brewing** 1765 W 3rd Ave, Columbus, OH 43212 We're going to try a new dojo location for a few weeks and see how it works Dojos are informal Python group study sessions where everyone interested in Python gathers to learn about Python, help others with Python, or just hang out. Everyone is welcome from Python beginners to experts. Bringing a laptop is encouraged (we'll have extension cords and power strips). If there's something you want to learn leave a comment on this invite so we can plan ahead. We're looking for speakers for our Monthly Meetups! Fill out the form if you are interested in presenting to the Python Community. https://forms.gle/ehSfUAC2WgR34Crq9

WQC has weekly Thursday night social nights at the Westerville Java Central. Come and grab a coffee and connect with the community: low stakes, chill environment, and tasty drinks. No registration is required; come as you are.

We have moved to guild.host. Look us up there. https://guild.host/events/buckeye-cocoaheads-rcavwd

Topic to be announced. **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com

Model Context Protocol (MCP) is emerging as a standard way for AI models to securely interact with external tools and systems. This session provides a practical deep dive into MCP architecture, core concepts, and real-world integration patterns. We will explore how MCP enables structured tool calling, improves interoperability, and simplifies AI integration in existing applications. The talk will include examples of connecting AI models with APIs, databases, and enterprise systems, with a focus on how developers can adopt MCP in Java-based environments. **Note**: This is a hybrid in-person/online event. Food and social for those in the OCI training room starts at 6:00pm. Presentation starts at 6:30pm for those online and in the training room.

**✅ Bachata Mondays with Todd Smith!** **👉 Beginner Bachata Class** **$15 In Advance / $20 At the Door** 7:00 pm – 7:15 pm … Registration 7:15 pm – 8:15 pm … Beginner Class **👉 Intermediate Bachata Class** **= $15 In Advance / $20 At the Door** 8:15 pm – 8:30 pm Registration 8:30 pm – 9:30 pm Intermediate Class **👉 If You Take Both Bachata Classes** **= $25 In Advance / $35 At the Door** **👉 Buy Advance Tickets Now at:** https://columbussalsadancing.com/bachata-mondays-dance-class-tickets/