java

Modern Java Fast-Track

Upgrade your codebase to modern standards by mastering the powerful features in Java 21 and 25.

Expected Outcome

You get a toolbox that replaces heavy patterns with elegant and future-proof solutions in Java.

Target Audience

For senior developers wanting to modernize their codebase and eliminate technical debt with Java 21 and 25.

Prerequisites

Java 8/11 experience is required, but for basics, 'Java Jumpstart: The Essentials' is recommended first.

Curriculum & Highlights

Records & Boilerplate Reduction
Pattern Matching for Switch
Sealed Classes & Type Safety
Sequenced Collections Features
Java 21/25 Migration Strategies
Text Blocks for Readability

Challenges we address

"How do you replace old for-loops and if-else chains with modern Pattern Matching for switch?"

"What are the main benefits of moving from traditional POJOs to Records in Java 21/25?"

"How do you use Sealed Classes to create more predictable and secure domain models?"

Detailed Description
Many Java applications today are locked in patterns from the Java 8 era, resulting in a cumbersome codebase filled with unnecessary boilerplate. This technical debt leads to more bugs and lowers motivation as teams miss out on the elegant solutions offered by modern versions. Without a focused upgrade, development remains stuck in outdated constructs that make systems unnecessarily complex to maintain. This workshop addresses these challenges through Active Learning where we refactor old syntax into modern powerhouses like Records, Switch Expressions, and Pattern Matching. I guide you through the journey to Java 21 and Java 25 to create applications that are easier to read, faster to develop, and optimized for modern cloud environments. We establish a new standard for code quality that makes your team more productive and your codebase ready for future demands immediately. We analyze how Records replace traditional POJOs by offering immutable data carriers with minimal syntax, and how Sealed Classes combined with Pattern Matching create type-safe domain models where the compiler guarantees coverage of all logical flows. By implementing features like Text Blocks, Sequenced Collections, and the latest JVM performance enhancements—including Virtual Threads (Project Loom)—we build systems that handle high loads with significantly lower cognitive overhead and resource consumption. Actlea's core philosophy is that migrating to Java 25 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 an attractive tech stack and high delivery velocity in 2026. By radically reducing the cognitive load of the codebase, the space required for the team to focus on innovation and business value instead of technical debt is created.
Recommendation & Next Steps

With modern syntax in place, 'Modern Functional Java: Streams' is recommended to radically simplify and streamline the team's daily 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 Refactoring Clean Code Records Modern Java
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.

Connect on LinkedIn

End clients I've trained

Academic Work
Handelsbanken
Scania
Swedbank
CGI
SEB
Participant Reviews

What past participants say

Read about the pedagogical approach, the hands-on labs, and the impact on daily work.

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Ready to elevate your
team's expertise?

Book a single workshop, combine modules into a package, or plan a full-scale bootcamp. My training is built on proven standard modules, ready to be delivered immediately to your team, regardless of your location.

  • Expert standard modules for senior teams
  • Global delivery across all time zones
  • Fixed group rate for up to 12 participants (remote)
  • Flexible delivery: Remote or On-site

Get in touch for a quote or to discuss availability.