compileOptions {
        // Enable support for the new language APIs
        coreLibraryDesugaringEnabled true

        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17

    [...]

dependencies {
    [...]
    // GPX Library
    implementation 'io.jenetics:jpx:3.2.1'
    implementation 'javax.xml.stream:stax-api:1.0-2' // adds javax.xml.stream with XMLStreamWriter etc
    implementation 'com.fasterxml.woodstox:woodstox-core:6.4.0' // actual implementation of a XMLOutputFactory etc

}

	GPX gpx = GPX.builder()
			.addWayPoint(WayPoint.of(48.208174, 16.373819)) // Vienna
			.build();

	String gpxString = GPX.Writer.DEFAULT.toString(gpx);