HappyCoders Developer Blog: Java, Algorithms, Data Structures

Hexagonal Architecture With Quarkus
[Tutorial]

Sven WoltmannOctober 30, 2023

In the fourth part of the series on hexagonal architecture, we migrate the existing application to a Quarkus application... without changing a line of code in the application core.

Ports and Adapters Java Tutorial: Adding a Database Adapter

Sven WoltmannOctober 4, 2023

In the third part of the series on hexagonal architecture, we extend the application with a JPA adapter that stores the data in a MySQL database.

Best Books on Presentation Design
(Updated 2023)

Sven WoltmannSeptember 28, 2023

Discover the best presentation design books: tips, inspiration, and expert advice for effective and visually appealing presentations.

Hexagonal Architecture with Java – Tutorial

Sven WoltmannJuly 4, 2023

In this article, I will show you step by step how to implement a Java application with hexagonal architecture – and how to enforce compliance with the architectural rules using Maven and the library “ArchUnit”.

Structured Concurrency in Java with StructuredTaskScope

Sven WoltmannJune 14, 2023

What is Structured Concurrency and why do we need it? How does StructuredTaskScope work? What is the advantage of Structured Concurrency?

Java 21 Features
(with Examples)

Sven WoltmannJune 8, 2023

The new Java 21 features with examples: Virtual Threads, Sequenced Collections, Record Patterns, Pattern Matching for switch; new preview features: String Templates, Unnamed Patterns and Variables, Unnamed Classes and Instance Main Methods ... and more!

The Best Books for Programmers
(Updated 2023)

Sven WoltmannMay 25, 2023

In this article, I’ve compiled a list of the best software engineering books. The lists contains book about software design, object-oriented design, software development and software testing.

Java 20 Features
(with Examples)

Sven WoltmannMarch 21, 2023

The new Java 20 features with examples: Scoped Values (Incubator), Record Patterns (Second Preview), Pattern Matching for switch (Fourth Preview), Foreign Function & Memory API (Second Preview), Virtual Threads (Second Preview), Structured Concurrency (Second Incubator)

How to Change Java Versions in Windows
(Updated for Java 21)

Sven WoltmannMarch 21, 2023

In this article, I'll show you how to install several Java versions simultaneously in Windows and how to switch between them on the command line with short commands.

Best Product Design Books
(Updated 2023)

Sven WoltmannMarch 4, 2023

In the context of books for founders and entrepreneurs and business management books, in this article you will find the best books on how to design and develop products that attract and keep the attention of customers. You can then read about how to get these products to buyers in books on digits marketing, for […]

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