Links from the Devoxx talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

These are the links from the Devoxx talk in Antwerp, Belgium, on October 9, 2025: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry Pi”.

Talk Description

Since 2012, Pi4J has enabled Java to control electronic components connected to the Raspberry Pi’s GPIO pins. However, both Java and the Raspberry Pi have evolved significantly since then. Supporting new hardware has been a challenge, requiring multiple implementations in the Pi4J library with complex code based on the Java Native Interface (JNI) and Java Native Access (JNA).

The Foreign Function & Memory (FFM) API, finalized in Java 22, promised to make such integrations with native code a lot easier. With Java reaching a new Long Term Support version, it’s time to bump the Pi4J project to Java 25 and make full use of FFM!

In this talk, you’ll learn how this FFM implementation is much easier to support and achieves high performance due to less memory copying and less interop code. It will also help improve the Pi4J project: fewer dependencies, a smaller JAR footprint, support for more protocols, and compatibility with more SoCs, among other benefits.

Through live demos, you will learn how to control LEDs, read buttons, interface with LCD displays, and gather sensor data using JBang single-file example applications. You’ll see how FFM makes hardware interaction as natural as regular Java programming, and you will be ready to start your own experiments as soon as you arrive home.

Links Used During The Talk

• How Java evolves
  • https://github.com/openjdk/
  • https://webtechie.be/post/2020-10-21-build-openjdk-on-raspberry-pi/
  • https://webtechie.be/post/2024-09-04-timezone-change-kazakstan/
  • https://openjdk.org/projects/
  • https://openjdk.org/jeps/0
  • https://docs.azul.com/core/incubator-preview-features
• Project Panama
  • https://openjdk.org/projects/panama/
• Foreign-Memory Access API
  • https://openjdk.org/jeps/370
  • https://openjdk.org/jeps/383
  • https://openjdk.org/jeps/393
  • https://inside.java/2025/06/12/ffm-vs-unsafe/
• Foreign Linker API
  • https://openjdk.org/jeps/389
• Foreign Function & Memory API
  • https://openjdk.org/jeps/412
  • https://openjdk.org/jeps/419
  • https://openjdk.org/jeps/424
  • https://openjdk.org/jeps/434
  • https://openjdk.org/jeps/442
  • https://openjdk.org/jeps/454
• Jextract
  • https://jdk.java.net/jextract/
  • https://github.com/openjdk/jextract/blob/master/doc/GUIDE.md
• Vector API
  • https://openjdk.org/jeps/338
• Java 11 versus 25 code examples
  • https://www.jbang.dev/
  • Memory management
    • FFMMemoryManagement.java
    • Java11MemoryManagement.java
  • Pixelbuffer example
    • FFMPixelBuffer.java
    • Java11PixelBuffer.java
  • Native calls
    • FFMNativeCalls.java
    • Java11NativeCalls.java
• Pi4J
  • https://www.pi4j.com/
  • https://github.com/Pi4J/pi4j
• Fixing the Raspberry Pi 5 Problem
  • https://api.pi4j.com/board-information/MODEL_5_B
  • https://github.com/Pi4J/pi4j/issues/321
  • https://www.pi4j.com/blog/2024/20240318_interview_alexander_liggesmeyer/
  • https://www.pi4j.com/documentation/providers/
• Integrating the FFM API
  • https://github.com/DigitalSmile/gpio
  • https://github.com/Pi4J/pi4j/issues/454
  • https://www.pi4j.com/about/team/
  • https://github.com/Pi4J/pi4j/pull/458
• Pi4J Code > FFM Plugin
  • https://github.com/Pi4J/pi4j/tree/develop/plugins/pi4j-plugin-ffm
• Soon available
  • https://www.pi4j.com/about/release-notes/
  • https://github.com/pi4j/pi4j-drivers/
  • https://github.com/Pi4J/pi4j-example-devices/
• Elecrow CrowPi
  • https://www.pi4j.com/examples/crowpi/
  • https://github.com/Pi4J/pi4j-example-crowpi
• Code and Demo
  • https://www.jbang.dev/
  • https://www.pi4j.com/examples/jbang/
  • https://github.com/Pi4J/pi4j-jbang
• Vaadin Code and Demo
  • https://start.vaadin.com/app/
  • https://github.com/FDelporte/Vaadin-examples
  • https://webtechie.be/post/2025-09-23-live-session-matti-tahvonen-pi4j-vaadin-spring/
• What’s next?
  • https://webtechie.be
  • https://foojay.io
  • https://pi4j.com