The last few months we've seen an increase in Java conferences. We'll try to not just enumerate, them but also mention the key talks in each of them.

This is Part 1 of a series, where we begin by looking at three Voxxed conferences in no particular chronological order; Voxxed Days Bucharest, Voxxed Days Zürich and Voxxed Days Amsterdam 2025.

Voxxed Days is a community-driven series of tech events organized by local community groups and supported by the Voxxed team, as such it can be considered as the smaller version of Devoxx, however up to the same quality standards. Tech talks, tips, workflows and workshops as well as networking opportunities are all there.

At this point, I've got to mention that we'll look at conferences that have all or most of their talks uploaded on Youtube. Saying that, let's commence with Voxxed Days Bucharest which took place between the 26 and the 27 of March.
Many interesting talks took place, of which we singled out a few. These are:

Simon Martinelli - Goodbye Microservices, Hello Self-Contained Systems". Simon, a well known figure mostly active in the Vaadin circles gave a talk that addressed the pain points of Microservices, offering the alternative way of Self-Contained Systems (SCS). Unlike microservices, SCS allows each part of your application to operate independently with its UI, logic, and database, simplifying both development and deployment.

Laurențiu Spilcă & Ionuț Baloșin - "Unlocking the unknowns: Cryptography Essentials for Java devs". When wasn't cryptography a hot subject? this talk explores key cryptographic principles and practical applications in Java, including encryption, hashing, secure key management, and common pitfalls to avoid. Watch it to understand the underlying principles regardless if you do Java or not.

And, Alex Shershebnev - "AI Coding Agents and how to code them". Of course Agentic AI is all the rage right now, as such this talk is a real eye opener on what those agents can do for coders and why they can deliver the promise of coding smarter that the current generation of coding assistants can’t.

Now let's jump to Voxxed Days Zürich which took place on the 25th March. Topics ranged from Architecture, Data & AI, Development Practices, Frontend Development and more.
Of those a top talk was "Be more productive with IntelliJ IDEA" by Marit van Dijk. IntelliJ is of course the Java dev's favorite editor. This talk is full of tips on how to use it more productively.

Another topic never out of date due to its complexity, is SSO. So in this talk by Daniel Garnier-Moiroux "OAuth2, OpenID: SSO under the hood" he goes to implement an authentication flow, without using an existing library. This helps in visualizing the steps involved, and it'll give you a sense of what that oauth2 library you need to use actually does.

Agentic AI again in "AI-infused command-line applications" , where Martin Stefanko goes through Quarkus and its LangChain4j extension which make creating AI-powered command-line applications effortless.

Last but not least, Voxxed Amsterdam which run through the 1st and 2nd of April. More IntelliJ in "Debugging with IntelliJ IDEA" by Anton Arhipov. Anton demos various features for debugging Java applications, including not-so-standard ones.

Of course the usual "Bootiful Spring Boot" by Josh Long, the series which showcases the power of Spring Boot and outlines its future developments.

Lastly, "Java 24: A story about code, conflicts and conquer" by Lutske de Leeuw. She takes us through her journey through common development struggles, showing how Java 24 features become the tools she uses to solve her problems.

Many more talks to check out. Links to all those aformentied top talks bellow. For all the talks of the conferences, hit "From this series" on the top right Youtube menu. Enjoy!

More Information

Voxxed Days Bucharest
Simon Martinelli - Goodbye Microservices, Hello Self-Contained Systems

Laurențiu Spilcă & Ionuț Baloșin - Unlocking the unknowns: Cryptography Essentials

Alex Shershebnev - AI Coding Agents and how to code them

Voxxed Days Zürich
Marit van Dijk - Be more productive with IntelliJ IDEA

Daniel Garnier-Moiroux - OAuth2, OpenID: SSO under the hood

Martin Stefanko - AI-infused command-line applications

Voxxed Days Amsterdam
Anton Arhipov - Debugging with IntelliJ IDEA

Josh Long - Bootiful Spring Boot in 2025

Lutske de Leeuw - Java 24: A story about code, conflicts and conquer

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