This Java library provides serial port access for Linux, macOS, and Windows using Java's Foreign Function & Memory (FFM) API (java.lang.foreign).

serial-ffm requires Java 23 (java.base) or newer. (Older versions exist for JDK 19, JDK 21, and JDK 22). The implementation is a port of the serial-native C libraries written to use JNI.

The Java bindings from native library headers are generated using jextract, leveraging the gradle-jextract plugin in the gradle build file.

./gradlew build -x test

Jextract is not run by default; to run it, pass -PrunJextract.

Using a serial port named portId in a try-with-resources statement:

try (var port = SerialPort.open(portId)
                          .baudrate(19_200)
                          .databits(8)
                          .parity(Parity.Even)
                          .stopbits(StopBits.One)
                          .flowControl(FlowControl.None)) {

    var in = port.inputStream();
    var out = port.outputStream();
    // use streams ...
}