HappyCoders Developer Blog: Java + Software Architecture

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

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

Stable Values in Java - Finally Initialize Values Safely!

Sven WoltmannApril 9, 2025

What are Stable Values and how do you use them? What are Stable Lists, Stable Maps, and Stable Functions? How do Stable Values work internally?

Java Compact Object Headers
(JEP 450)

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?

Java 24 Features
(with Examples)

Sven WoltmannDecember 4, 2024

All Java 24 features with examples: Stream Gatherers, Synchronize Virtual Threads without Pinning, Ahead-of-Time Class Loading & Linking, Compact Object Headers - and more!

ahead of time class loading & linking - feature image

Ahead-of-Time Class Loading & Linking – Turbo for Java Applications

Sven WoltmannDecember 3, 2024

What is Ahead-of-Time Class Loading & Linking? How does it work, and how can it improve the startup time of Java programs by 42%? How does it differ from AppCDS?

Primitive Types in Patterns, instanceof, and switch

Sven WoltmannDecember 3, 2024

How can we use primitive types in pattern matching with `instanceof` and `switch`? How do primitive type patterns differ from reference type patterns?

Importing Modules in Java: Module Import Declarations

Sven WoltmannDecember 2, 2024

How to import entire modules with “import module” and thus avoid long import lists? And how to resolve ambiguous class names?

Compressed Oops in Java

Sven WoltmannNovember 27, 2024

How can "Compressed Oops" be used on a 64-bit system to represent object references with only 32 bits?

java object header and compressed class pointers hero image

Java Object Headers and Compressed Class Pointers

Sven WoltmannNovember 25, 2024

What is the structure of a Java object header? What are the Mark Word and Class Word? How can Compressed Class Pointers be represented on a 64-bit system using only 32 bits?

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