Java API sound

Hi

I'm trying to use JAva sound API but I have an error on some computers
with this code :

import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.BooleanControl;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.Mixer;

public class ControlTest {

    public static void main(String[] args) throws
LineUnavailableException, InterruptedException {
        Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
        for (int i = 0; i < mixerInfos.length; i++) {

            System.out.println("AudioSystem info Name
:"+mixerInfos[i].toString());
            Mixer mixer = AudioSystem.getMixer(mixerInfos[i]);

            Line.Info[] targetLineInfos = mixer.getTargetLineInfo();
            System.out.println("target infos : " +
targetLineInfos.length);
            for (int j = 0; j < targetLineInfos.length; j++) {
                setVolume(targetLineInfos[j]);
            }
        }
    }

    static boolean setVolume(Line.Info lineInfo) {
        try {
            System.out.println(lineInfo);
            Line line = AudioSystem.getLine(lineInfo);
            System.out.println("open " + line.getLineInfo());
            line.open();

            BooleanControl muteControl
=(BooleanControl)line.getControl(BooleanControl.Type.MUTE);
            System.out.println("mute " + muteControl);
            muteControl.setValue(true);
            FloatControl control =
(FloatControl)line.getControl(FloatControl.Type.VOLUME);
            control.setValue(control.getMinimum());
            System.out.println("val " + control.getValue());
            FloatControl controlp =
(FloatControl)line.getControl(FloatControl.Type.MASTER_GAIN);
            controlp.setValue(control.getMinimum());
            System.out.println("val " + controlp.getValue());
            line.close();
        } catch (Exception e) {
            System.out.println(e);
            return false;
        }
        return true;
    }
}

Error :
java.lang.IllegalArgumentException: Unsupported control type: Mute

Is there a solution to control it ? Because I can control the Speaker
Sound but not microphone...

Thanks for your ideas
Meric pour vos idees d avance =]