Latest Java Tutorials

If I could start learning to code all over again in the AI era, here's what I would do differently to avoid 7 mistakes from my 20+ years as a Java developer.

Learn a simple formula to convert between Java versions and class file versions in seconds. No need to memorize the mapping table!

In this tutorial, I share how to download and install Oracle JDK 25 on macOS, from choosing the right installer for your Mac to verifying the installation. I'll also show you how to configure JAVA_HOME when multiple JDK versions are installed.

Enjoy 15 hilarious Java developer memes about AI coding, vibe coders, coding agents, Spring Boot, hallucinations, bugs, and the future of programmers.

In this tutorial, I'll guide you step by step through downloading, installing, and configuring OpenJDK 25 on Windows. You'll learn how to set JAVA_HOME, update the PATH environment variable, and verify your Java installation. Based on my experience working with Java for many years, I'll also share practical tips to help you avoid common setup issues.

Learn how to download and install OpenJDK 25 on macOS step by step, configure JAVA_HOME and PATH, and verify Java 25 installation on your Mac.

Is Java still worth learning in the AI era? As a Java developer, I share my concerns about AI, programming jobs, and Java’s future, then reflect on opinions from a Reddit discussion that gave me a more optimistic perspective.

I’ve used Java String for years, but I had never seriously asked how large a String could actually be. So I experimented with the limits myself - from the maximum String literal in a class file to a runtime String containing more than 2.1 billion characters. The results were interesting, and a few of them were surprisingly mysterious.

Take a break from coding and enjoy a collection of hilarious Java memes about `NullPointerException`, curly braces, Eclipse vs. IntelliJ, Spring Boot, JAR files, and the legendary “Write once, run anywhere” slogan. If you’ve ever written Java, some of these memes may feel painfully familiar.

New to Java? Take a break from syntax and tutorials with these funny Java memes made for beginners. From `Hello World` and `NullPointerException` to Generics, the JVM, garbage collection, and Java’s famous coffee obsession.

What's new in Java 27? Find out by relaxing with these memes. Keep you updated with Java technology in the funny way.

The only guide you need to download and install Java Development Kit (JDK) on Windows computer with Oracle JDK 25 distribution. Step by step guide, in-depth instruction, clear illustration screenshots.

Discover how the 80/20 rule applies to real-world programming and software development, from reading code and fixing bugs to performance, teamwork, libraries, features, project planning, and AI-generated code. These 10 facts may help you resolve some issues in your software project.

Code examples to implement an authorization server with persistent client credentials using Spring Security OAuth2 Authorization Server library. The client credentials are stored in a relational database (MySQL).

Code examples about modifying the JWT access tokens generated by Spring authorization server, including add, update and remove claims.

Guide to fully delete a standalone installation of IntelliJ IDEA from macOS

Guide to implement Spring authorization server with OAuth2 client credentials grant type and in-memory clients (users) with Java code examples. REST clients then call the authorization server to obtain new access tokens to access protected APIs and resources.

Solution to fix the error: The method applyDefaultSecurity(HttpSecurity) from the type OAuth2AuthorizationServerConfiguration has been deprecated

The complete guide to set up Java Development Kit (JDK) version 23 on Mac computers with OpenJDK 23 binary distribution.

The complete, step-by-step guide to download, extract, install, configure and verify Java Development Kit (JDK) on Windows with OpenJDK 23 binary distribution.