Java Sound format not supported

When using the following code: http://pastebin.com/5iVnttiP

I receive this error:

javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED 16000.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian not supported.
    at com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen(Unknown Source)
    at com.sun.media.sound.AbstractDataLine.open(Unknown Source)
    at com.sun.media.sound.AbstractDataLine.open(Unknown Source)
    at com.AIComputer.model.Recorder.<init>(Recorder.java:124)
    at com.AIComputer.AIComputer.main(AIComputer.java:7)

Now I did some research and found out that not all sound cards support every format, however when running this demo: http://java.sun.com/products/java-media/sound/samples/JavaSoundDemo/ I managed to produce a recording using the exact same parameters (linear, 16000, 16, signed, little endian, stereo).

I have no idea what I'm doing wrong here (also since I'm still a beginner at Java coding).

Any help will be greatly appreciated!