Tutorials

What are Hidden Classes in Java 15?

As we know, sun.misc.Unsafe APIs are not recommended to use outside the JDK, with a slight mistake it may result in a JVM crash. In some cases, code may not be portable across different platforms and many other problems that may occur.

Classes that cannot be used directly by the bytecode of other classes are hidden classes. Hidden classes allow frameworks/JVM languages to define classes as non-discoverable implementation details, so that they cannot be linked against by other classes.

Why I Love IntelliJ IDEA for Java Development

If you’re a Java developer like me, you like to crank out code and get shit done. I like many things about IntelliJ IDEA, but I thought it’d be fun to write about the ones that make me most productive.

When I first started doing Java development in the late 90s, I used HomeSite as my editor. HomeSite was an HTML editor initially developed by Nick Bradbury. I liked it because it defaulted to a view of your code rather than being WYSIWYG like Dreamweaver and FrontPage. It’s funny to look back now and laugh about how inefficient I was: I used to google for import statements, then copy/pasted them into the editor.

Native Applications for Multiple Devices from a Single JavaFX Project with Gluon Mobile and GitHub Actions

The power of JavaFX combined with the Gluon tools and GitHub actions is amazing. Building and distributing a truly cross-platform application has never been easier!

Really not a single code change is needed to run on different platforms. As you can see from the build processed, the exact same code is used to create native applications for both Windows, Linux, MacOS, iOS, and Android!

Starting a JavaFX Project with Gluon Tools

Here on foojay.io you can already find two posts by Carl Dea to get you started with JavaFX.

In this post, I want to show you yet another approach that uses the tools provided by Gluon, who are the maintainers, and the driving force behind OpenJFX.

The Gluon start website and the plugin allow you to get started with a new JavaFX project in a few clicks.

Thanks to the amazing work done by the Gluon team this also gives you a quick-start for the creation of a mobile application which can be built for both Android and iOS.

For the Record!

Ever since Java announced their 6-month release cycle, there is excitement around exploring new features and even more so with preview features.

Now, what is a record? It is a new variety of type declaration. It is also a sub-type of class. A common type of class, as we all know, is the data-carrier class. They are classes that have some fields and their corresponding getters and setters. They usually have little to no logic.

Records help provide a way to succinctly describe the intent of these data-carrier classes. A little less conversation, a little more action.

Getting Started with FXGL Game Development

FXGL is a JavaFX Game Library Engine for Java and Kotlin, created by Almas Baimagambetov.

In this article, you’ll read what FXGL is, what it is good for, what its dependencies are, as well as a complete scenario with a video and code snippets to set up your first FXGL scenario from scratch.

Getting Started with Payara Server

In this article, you’re presented with four short videos that will take you step-by-step through installing, writing, and deploying an application to Payara Server, even if you’ve never used the application server before.

Visit the Payara Getting Started page for further resources on getting started, including: Configuring, Adding a data source, Adding functionality, monitoring, security auditing, Creating a Restful Web Service, Logging, Testing Apps, etc.

New to IntelliJ IDEA? Me Too!

Until recently, I last wrote Java in anger in 2002. IntelliJ IDEA had just been released; it wasn’t remotely on my radar. I honestly can’t remember what IDE we were using back then, but it certainly was a very long way to the fully featured IDE that JetBrains produce today.

Here’s my personal experience of using IntelliJ IDEA for the first time.

Electronics & Quarkus Qute on Raspberry Pi

The “Hello World” version of electronics programming is a blinking LED. But, in this post, we will go a few steps further and control 8 LEDs inside a number display.

Igor De Souza, Dublin based Principal Big Data Consultant at Oracle, set up an interesting experiment in which he combines a LED number display with the Raspberry Pi and Quarkus.

A Simple Service with Spring Boot

I will demonstrate how to create a simple Web Service using Spring Boot.  This framework makes it almost effortless to develop web services, so long as the appropriate dependencies are in place.

In this example, I will create a Web Service that will read the current temperature from a file and make it available to clients via a RESTful endpoint.