2025-09-24, by Frank Delporte
During a live stream coding session, Matti Tahvonen and Frank Delporte updated an existing Vaadin+Spring+Pi4J demo application to use the latest version of the libraries and Java 25. It’s a demo application created a few years ago to be used during presentations at conferences. Of course, everything evolves, so a big update and refactoring was needed.
(Sorry for the hiccups in the first minutes, the network connection dropped a few times…)
Links from this video:
However, during the live session, a problem appeared when building the application for the Raspberry Pi. But the problem was quickly fixed after the stream was finished, as you can see in the video below. And we now have a nice graphical view of the temperature and humidity measured with the DHT11 sensor on the CrowPi 2.