Java 185
Java is the core topic across this site. These posts cover modern Java features, OpenJDK evolutions, performance tuning, tooling, and hands-on development lessons from real projects.
Foojay Podcast #13: Denver and Boulder JUG
Running a Java User Group takes more than booking a room and picking a topic. Speakers go quiet, venues close, and attendance swings hard after a pandemic. In this stop of the …
Foojay Podcast #12: State and Future of the IDEs
Every Java developer picks an IDE, and that choice shapes the day-to-day work. But what does it take to keep an IDE current when the language ships a new version every six months …
Foojay Podcast #11: Looking Back to 2022 and Predictions for 2023
Every new year invites a familiar question. Which of last year’s bold tech bets actually played out, and which fizzled? We sit down with Ted Neward to score his 2022 …
New Section Added to Foojay.io: Java Quick Start
Foojay.io aims to be the starting point for “all-things OpenJDK,” but during one of my morning walks the idea struck me that this site really needs complete beginner materials, …
Foojay Podcast #10: JUG World Tour: Dubai JUG
Starting a Java User Group from scratch takes more than enthusiasm. It takes speakers, attendees, sponsors, and a local culture that wants to show up. We sat down with Jad Salhani …
Foojay Podcast #9: The State of JavaFX Framework, Libraries, and Projects
Plenty of developers still think Java only lives on the server. JavaFX tells a different story, from desktop tools to CAD apps to a brain-computer interface visualizer. To map out …
HiveMQ Cloud, part 4 - Sending sensor data from Raspberry Pi Pico W to HiveMQ Cloud
Exactly one year ago, in December 2021, I published three articles of MQTT messaging with Raspberry Pi, Raspberry Pi Pico and HiveMQ Cloud . On June 30th of 2022, Raspberry Pi …
Foojay Podcast #8: JUG World Tour: Manchester
Running a Java User Group sounds simple until you try it. Finding speakers, picking venues, keeping people coming back, and growing the audience takes real work. To kick off a new …
Schedule your holiday for 2038
The end of the year is approaching, so it’s time to start scheduling your holidays for the next year. But I decided to go a step further and already planned those for 2038! …
Foojay Podcast #7: Security in Java, what do we need to know and how to keep our applications secure?
Every Java application carries a stack of dependencies, and any one of them can hide a vulnerability that puts your users at risk. Knowing how to spot weak spots, harden code, and …
Foojay Podcast #6: Welcome to Foojay!
Ever wondered what runs the Foojay.io community behind the scenes? After 2.5 years and hundreds of posts since that first article in April 2020, the site has grown into a hub for …
Devoxx Belgium and J-Fall The Netherlands - Links
Links used in my talks at Devoxx 2022 (Antwerp, Belgium) and J-Fall (Ede, The Netherlands).
Leanpub Frontmatter: Frank Delporte, Author of Getting started with Java on the Raspberry Pi
Writing a technical book while holding down a day job sounds intimidating, but it can also become the thing that shapes a career. Frank started small with blog posts about Java on …
Foojay Podcast #5: OpenJDK 19 Discussion Panel
Every six months a new Java release lands, and OpenJDK 19 is no exception. The big question for working developers is which features matter today, and which ones reshape how we …
Create Music Bingo cards with iText
It has been a while since I last had to create documents in a program, and iText has been “on my radar” to try out for a while now. This weekend we had a party and …
Blink a LED and read a button state with Vaadin, Spring and Pi4J on a Raspberry Pi
As I’m becoming a senior developer in terms of age, I’ve transitioned from one language to another. One of my main interests has always been clean, easy-to-understand …
Installing Java with SDKMAN on Raspberry Pi
If you create a new SD card for a Raspberry Pi with the operating system, you can choose the “Raspberry Pi OS Full (32-bit)” edition, which includes Java 11. But a lot …
HiveMQ Cloud, part 3 - Sending sensor data from Raspberry Pi Pico to HiveMQ Cloud
In the previous two posts in this series, we used Java on the Raspberry Pi mini-computer to send sensor data to HiveMQ Cloud, and visualize it on a dashboard.
HiveMQ Cloud, part 2 - Using MQTT and Raspberry Pi to Visualize Sensor Data on a TilesFX Dashboard
In the previous post we started our discovery of HiveMQ Cloud with Java on the Raspberry Pi. We created an application to send measurements of various sensors to the HiveMQ Cloud …
HiveMQ Cloud, part 1 - MQTT on Raspberry Pi, Send Sensor Data to HiveMQ Cloud with Java and Pi4J
A few years ago I did my first experiments with an MQTT server (Mosquitto) running on a Raspberry Pi to connect an Arduino and Raspberry Pi for the drumbooth of my son . The full …