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01-2026 | Agentic AI Meets Java
JCON ▪️JCON Meets Enterprise AI – From Basics to Production CORE JAVA▪️Best Practices for Writing Clean Code in Java▪️Unlocking Developer Productivity with Java 25: Features You’ll Actually Use▪️Pattern Matching in Java 25: Writing Cleaner, Safer, Faster Code▪️Intelligent Test Automation in…
JCON Meets Enterprise AI – From Basics to Production
From April 20–23, 2026, the European Java community will once again gather in Cologne for JCON EUROPE 2026. Taking place at the Cinedom multiplex cinema, the conference brings together developers, architects, and Java enthusiasts for four days of knowledge sharing, inspiration, and…
Houston, we have problems with the queries
introduction Most developers build queries to access a relational database, using some ORM in different ways to generate the query automatically or write the query manually. Everything could work in most cases in other environments, but at some point, the query becomes slow, or the…
How To Do Structured Concurrency in Java 25
It was a Friday night and we’d gone out for some drinks with a few colleagues. We ended up at one of those places where the drinks aren’t listed on the menu, so when the waiter asked us what drink we wanted we just asked if he could list a few. He was being very thorough, because he started…
What I (Still) Miss: My Most Wanted Java Features
Overview Java, the grandfather of JVM languages, continues to evolve and is becoming richer in features with each update, thus steadily improving the productivity of developers. In parallel with this evolution, other languages have popped up with their own sets of features (and often with…
Java 25 + GenAI: A New Era for Microservices in Finance
Java 25 and GenAI combine to build explainable, scalable microservices for finance — blending performance, transparency, and open-source innovation in one architecture.
Test Your Tests: Mutation Testing in Java with PIT
Beyond Code Coverage Automated tests have become a standard component of professional software development. Whether through classic unit testing or a fully test-driven development (TDD) workflow, tests help to ensure that applications are correct, maintainable, and refactorable. Most…
25 Versions in 30 Years: A Brief History of the Java Language
In an interesting alignment of events, the twenty-fifth version of Java, JDK 25, is being released in 2025, which also happens to be the 30th anniversary of the platform’s launch. This seems like an opportune time to have a look back at how the Java language has evolved and what new features…
Java 25: JEP 512, JBang, Notebooks, GraallPy and Raspberry Pi for Interactive Learning
When most people think of Java, their minds jump immediately to enterprise software, Android applications, or large back-end systems that power banking, insurance, and healthcare platforms. Rarely does Java come up in the context of exploratory learning, lightweight experimentation, or…
Sarcasm-as-a-Service: Five Years Later
TLDR; Demo App https://aka.ms/ttsazure, Repo: https://github.com/roryp/ttsazure I am 4 foot 1, and I have achondroplasia (dwarfism). Following spinal surgery, I was in a coma for three months and woke up unable to speak. I longed to tell my family that I loved them. That experience changed…
Elasticsearch Java SDK: No Magic, Just Solid Design Choices
Java’s API ecosystem is massive, but quality is not granted for free, and not necessarily widespread. Building a good API is not trivial, and focus is required. You need balanced abstractions, keep the threading model sane, and provide developers a satisfying experience. The…
The Myth of Stability: Java’s Software Supply Chain After Log4Shell
For as long as most Java developers can remember, we’ve lived inside a comforting story about our ecosystem. It’s the idea that Maven Central, the Jakarta stack, the Spring universe, the vast Apache landscape, and all the independent libraries quietly carrying enterprise workloads together…
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Cay Horstman invites you to #JCON EUROPE 2026
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