An attempt to open a SourceDataLine leads to LineUnavailableException if run with -Xfuture option.

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package testapp.sound;

import java.io.File;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;

public class OpenSDLine {
    public static void main(String[] args) {
        OpenSDLine inst = new OpenSDLine();
        
        try {
            inst.m1(args);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public void m1(String[] args) throws Exception {
        String audioFile = args[0];
        AudioInputStream ais =
                        AudioSystem.getAudioInputStream(new File(audioFile));
        DataLine.Info lineInfo =
                    new DataLine.Info(SourceDataLine.class, ais.getFormat());
        SourceDataLine sdLine = (SourceDataLine) AudioSystem.getLine(lineInfo);

        sdLine.open();
        sdLine.start();
        byte[] buf = new byte[1024];
        int bytesRead;
        while ( (bytesRead = ais.read(buf)) != -1) {
            sdLine.write(buf, 0, bytesRead);
        }
        sdLine.stop();
        sdLine.close();
    }
}
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$ java -version
openjdk version "1.6.0-internal"
OpenJDK Runtime Environment (build 1.6.0-internal-dherron_19_dec_2007_13_45-b00)
Java HotSpot(TM) Client VM (build 11.0-b06, mixed mode)

$ java -Xfuture -cp . testapp.sound.OpenSDLine [VALID_SAMPLED_AUDIO_FILE]
javax.sound.sampled.LineUnavailableException: Audio Device Unavailable
        at com.sun.media.sound.HeadspaceMixer.nResume(Native Method)
        at com.sun.media.sound.HeadspaceMixer.implOpen(HeadspaceMixer.java:344)
        at com.sun.media.sound.AbstractMixer.open(AbstractMixer.java:304)
        at com.sun.media.sound.AbstractMixer.open(AbstractMixer.java:341)
        at com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:121)
        at com.sun.media.sound.MixerSourceLine.open(MixerSourceLine.java:37)
        at com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:417)
        at com.sun.media.sound.MixerSourceLine.open(MixerSourceLine.java:37)
        at testapp.sound.OpenSDLine.m1(OpenSDLine.java:28)
        at testapp.sound.OpenSDLine.main(OpenSDLine.java:14)
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If no -Xfuture option is provided, the code works fine.