HappyCoders Developer Blog: Java + Software Architecture

Java 27 Features
(with Examples)

Sven WoltmannJune 4, 2026

All new Java 27 features explained clearly – with code examples: Compact Object Headers by default, G1 everywhere, quantum-safe TLS, Lazy Sets, and more.

Advent of Code 2025 – Java Solutions

Sven WoltmannDecember 5, 2025

Explore Advent of Code 2025 with clear Java 25 solutions focused on readability, SonarQube quality, and practical coding insights.

Java 26 Features
(with Examples)

Sven WoltmannDecember 3, 2025

All Java 26 features with code examples: HTTP/3, Lazy Constants, Ahead-of-Time caching with any GC, "final means final", a faster G1 GC, and more...

Withers in Java: Derived Record Creation Expressions
(Preview)

Sven WoltmannSeptember 3, 2025

Learn how Withers and Derived Record Creation Expressions simplify Java records, avoid boilerplate, and make working with immutable data structures easier.

Development team on a modern, futuristic sailboat at sunrise, looking ahead together, symbolizing the start of Java modernization.

Java Modernization: How to get your Team and Management on Board

Sven WoltmannAugust 11, 2025

How to get your team management excited about Java modernization – with clear arguments, practical examples quick wins for sustainable success.

Java 25 Features
(with Examples)

Sven WoltmannJune 5, 2025

Java 25: Scoped Values, Compact Source Files, Flexible Constructor Bodies, Compact Object Headers, and more – clearly explained, with examples.

Initialization-on-Demand Holder in Java - Feature Image

Initialization-on-Demand Holder Idiom in Java

Sven WoltmannMay 8, 2025

Learn how the Initialization-on-Demand Holder Idiom in Java enables secure and efficient lazy initialization without performance penalties.

double checked locking in java - feature image

Double-Checked Locking in Java – Thread-Safe and Correct

Sven WoltmannMay 8, 2025

Discover the Double-Checked Locking pattern in Java: Optimize thread-safe, lazy object initialization without performance losses.

Java Stable Values JEP 502 Feature Image

Lazy Constants in Java
(Stable Values)
– Safe and Lazy Initialization

Sven WoltmannApril 9, 2025

What are Lazy Constants and how do you use them? What are Lazy Lists and Lazy Maps? How do Lazy Constants work internally?

Compact Object Headers in Java
(JEP 519)

Sven WoltmannApril 7, 2025

Compact Object Headers compress Java object headers from 96 bits (12 bytes) to 64 bits (8 bytes). How does this work without loss of information?

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