Java ME: Problems with recording/playing audio

Hi,
I wanted to build a simple MIDlet that records audio data from the
microphone of my cell phone and plays it back afterwards. Unfortunately,
in the emulator the code hangs up on "rc.setRecordStream(output);" (See
">>>") after asking whether I want to allow the MIDlet to record audio
data. What is wrong with that line?

class RecordForm extends Form implements CommandListener{
  private StringItem messageItem;
    private StringItem errorItem;
    private final Command recordCommand, playCommand;
    private Player p;
    private byte[] recordedSoundArray = null;

    public RecordForm(){
        super("Record Audio");
        messageItem = new StringItem("Record",
            "Click record to start recording.");
        this.append(messageItem);
        errorItem = new StringItem("", "");
        this.append(errorItem);
        recordCommand = new Command("Record", Command.SCREEN, 1);
        this.addCommand(recordCommand);
        playCommand = new Command("Play", Command.SCREEN, 2);
        this.addCommand(playCommand);
        StringBuffer inhalt = new StringBuffer();
        this.setCommandListener(this);
    }

    public void commandAction(Command comm, Displayable disp){
        if(comm==recordCommand){
            try{
                p = Manager.createPlayer
                    ("capture://audio?encoding=pcm");
                p.realize();
                RecordControl rc =
                    (RecordControl)p.getControl("RecordControl");
                ByteArrayOutputStream output = new
                    ByteArrayOutputStream();


                rc.startRecord();
                p.start();
                messageItem.setText("recording...");
                Thread.sleep(5000);
                messageItem.setText("done!");
                rc.commit();
                recordedSoundArray = output.toByteArray();
                p.close();
            } catch (IOException ioe) {
                errorItem.setLabel("Error");
                errorItem.setText(ioe.toString());
            } catch (MediaException me) {
                errorItem.setLabel("Error");
                errorItem.setText(me.toString());
            } catch (InterruptedException ie) {
                errorItem.setLabel("Error");
                errorItem.setText(ie.toString());
            }
        } else if(comm == playCommand) {
            try {
                ByteArrayInputStream recordedInputStream =
                    new ByteArrayInputStream
                    (recordedSoundArray);
                Player p2 = Manager.createPlayer
                    (recordedInputStream,"audio/basic");
                p2.prefetch();
                p2.start();
            } catch (IOException ioe) {
                errorItem.setLabel("Error");
                errorItem.setText(ioe.toString());
            } catch (MediaException me) {
                errorItem.setLabel("Error");
                errorItem.setText(me.toString());
            }
        }
    }
}