ADDITIONAL SYSTEM INFORMATION :
Windows 10 Pro 1809 (17763.253)
openjdk full version "11.0.2+7"


A DESCRIPTION OF THE PROBLEM :
If I create multiple AudioClip instances with the same source String, then play them all concurrently, then stop 1 of the instances, they are all stopped.
Note that the source Strings must be exactly the same: if different source Strings are used, but they point to the same file, then the behavior is as expected.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
* create EntryPoint.java as given below
* run it


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Stopping the AudioClips is independent of each other
ACTUAL -
All AudioClips are stopped on stopping the first

---------- BEGIN SOURCE ----------
import java.net.URI;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.scene.media.AudioClip;
import javafx.stage.Stage;

import static java.util.stream.Collectors.toList;
import static javafx.scene.paint.Color.WHITE;

public class EntryPoint extends Application {

    @Override
    public void start(Stage stage) {
        stage.setTitle("AudioClip demo");
        stage.setScene(new Scene(new AnchorPane(), 640, 480, WHITE));
        stage.show();

        List<URI> sounds = Arrays.asList(
                URI.create("https://sample-videos.com/audio/mp3/wave.mp3"),
                URI.create("https://sample-videos.com/audio/mp3/wave.mp3"),
                URI.create("https://sample-videos.com/audio/mp3/wave.mp3")
        );
        List<AudioClip> players = sounds.stream()
                .map(sound -> new AudioClip(sound.toString()))
                .collect(toList());

        for (AudioClip p : players) {
            p.play();
            System.out.println("started one");
            sleep(Duration.ofSeconds(2));
        }
        sleep(Duration.ofSeconds(5));
        for (AudioClip p : players) {
            p.stop();
            System.out.println("stopped one");
            sleep(Duration.ofSeconds(5));
        }
    }

    private void sleep(Duration duration) {
        try {
            Thread.sleep(duration.toMillis());
        } catch (InterruptedException ignored) {
            Thread.currentThread().interrupt();
        }
    }

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
You can refer to the same source multiple times, but use different String representations, e.g.:
https://sample-videos.com/audio/mp3/../../audio/mp3/wave.mp3
https://sample-videos.com/audio/mp3/../mp3/wave.mp3
When doing so, the result is as expected