java

Modern Java Fast-Track

Upgrade the codebase by mastering Data-Oriented Programming, Java 21, and Virtual Threads.

Expected Outcome

Knowledge to separate data from logic (DOP) and the tools to build type-safe, high-performance, and asynchronous applications.

Target Audience

For experienced Java developers and architects wanting to eliminate technical debt and build massively scalable systems with modern Java.

Prerequisites

Professional Java experience is required; if the language is new, we recommend 'Java Jumpstart: Essentials' instead.

Curriculum & Highlights

Records & Text Blocks
Data-Oriented Programming (DOP)
Sealed Interfaces & Type Safety
Exhaustive Pattern Matching
Virtual Threads (Project Loom)
Sequenced Collections & Async API

Challenges we address

"How do you eliminate boilerplate and create immutable data using Records and Text Blocks?"

"How do you separate data from logic (DOP) using Sealed Classes and Pattern Matching?"

"How do you scale to millions of asynchronous tasks using Virtual Threads instead of reactive frameworks?"

Detailed Description
Many Java applications today are locked in patterns from the Java 8 and Java 11 eras. This results in cumbersome codebases filled with boilerplate and complex asynchronous frameworks. This technical debt not only leads to bugs but also slows down delivery. By embracing the paradigm shift of Data-Oriented Programming (DOP) and the groundbreaking features in Java 21, systems can be built that are radically simpler, safer, and more scalable. This workshop is built on Active Learning, where participants code extensively throughout the day in two parallel domains. The architecture is modernized by replacing outdated POJOs with immutable Records, and securing the domain using Sealed Interfaces. The compiler is then utilized to drive business logic through Pattern Matching, and finally, the system is scaled to hundreds of thousands of asynchronous tasks using Virtual Threads. Throughout the day, the module dives deep into separating data from logic to create code that is both highly readable and entirely type-safe. Complex reactive frameworks are discarded as Project Loom is implemented to handle massive concurrency using classic and sequential code. Combined with new interfaces like Sequenced Collections and proven tools like Callable, the ability to build next-generation Java systems optimized for the cloud is established. Actlea's core philosophy is that migrating to modern Java is not just about adopting new features, but a strategic move toward a more maintainable architecture. Experience demonstrates that mastering these modern language patterns is the single most important factor for maintaining high delivery velocity in 2026. By radically reducing the cognitive load of the codebase, the space required for the team to focus on innovation rather than technical debt is created.
Recommendation & Next Steps

With the architecture modernized, 'Functional Java: Lambda & Streams' is recommended to radically simplify data processing.

Format Workshop
Duration 1 day
Level Professional
Instructor Andreas Olsson
Price per group $2,900

Standard price per group (up to 12 participants) for remote delivery. Additional costs apply for onsite delivery.

Tech Stack
Java 21 Java 25 Project Loom Pattern Matching Records Virtual Threads
Andreas Olsson

Your Instructor

Andreas Olsson

Expertise through Active Learning

Java and the Spring Framework have been my core focus for over 20 years. Today, my mission is primarily to help organizations step into the future by integrating intelligent agents and AI-driven features into modern Java systems.

Actlea stands for Active Learning – the philosophy that programming is best learned by writing code, not by watching slides. My workshops focus on intensive, hands-on exercises designed to solve real-world problems.

I deliver proven training concepts globally across all timezones. While I specialize in remote delivery, I love to travel for onsite workshops. My modules are ready for immediate impact but can be tailored to your team's specific requirements.

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Enterprise teams trained by Actlea

Academic Work
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Scania
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CGI
SEB
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Read about the pedagogical approach, the hands-on labs, and the impact on daily work.

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Book a single workshop, a multi-day course, or a complete training package. The programs are built on proven standard modules of high technical quality, designed to be deployed immediately without lengthy preparation.

  • Expert-led training: Designed for professional development teams.
  • Standardized quality: Proven modules ready for immediate delivery.
  • Flexible formats: Execution is handled remote or onsite.

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