Combined Training Java 21 + 25: Virtual Threads, Stream Gatherers & All New Features Since Java 17

This training can only be booked for teams. If you’d like to attend as an individual, I offer two courses (in German) through ppedv:

• Modernes Java – Verständlicher Code durch aktuelle Sprachfeatures
• Skalierbare Java-Systeme mit Virtuellen Threads & Structured Concurrency

Both are possible: I can come to your company for an on-site training – anywhere in Germany, Austria, and Switzerland – or we run the training online, usually via Zoom.

I recommend a maximum of 12 participants per training – that way I can give everyone individual attention. There is no minimum: I charge per training, not per person.

The easiest way is the request form or an email to training@happycoders.eu. Right after submitting, you can book a video call via Calendly, where we discuss the details. You’ll then receive a concrete offer from me.

Ideally, you’re familiar with Java 17. If you’ve worked with Java 11, you’ll be able to follow along just fine – the most important differences are put into context during the course. In general, I recommend at least two years of hands-on experience with Java.

All participants need an up-to-date IDE with at least Java 25 – I use IntelliJ IDEA myself. Java 25 or later should also be installed in the terminal, as we’ll run some of the exercises there.

A training day consists of four 90-minute modules – six hours of net training time in total. Each module alternates between theory and practice two to three times, so you apply what you’ve just learned directly to code. There’s a short break between the first and second and between the third and fourth module, and a longer lunch break between modules two and three. We align the exact schedule with your working hours – that’s flexible.

About half theory, half practice: a short theory phase is followed directly by applying it to code – with examples from real projects. Listening alone doesn’t help much; the knowledge has to be used immediately for it to stick.

Yes – shortening topics, weighting them differently, changing the order, or combining content from different courses: I’m happy to adapt the agenda to your team. Since that means reworking the training materials, it involves extra effort – I’ll prepare an individual offer for you.

We usually use Zoom. If you prefer your own platform – for example, Microsoft Teams or Google Meet – I’m happy to work with that. Just let me know in advance.

Yes. Before the training, you’ll receive the exercises as a Git repository so you can get started right away. After the training, you’ll also receive the slides – including all solutions to the exercises.

Yes. All participants receive a certificate of attendance after the training.

Travel expenses are charged as a flat rate – depending on the training location and the number of overnight stays required. The exact amount is part of the individual offer I’ll send you.

Yes. For multiple booked trainings or follow-up bookings, I can offer a volume discount. We’ll discuss this in the video call, and I’ll include it in the offer.