How can we know if the microphone is functioning using jmf?

Question

Hi everybody,
This code never output "DataSource Not detected" neither the microphone is connected or not.
CaptureDeviceInfo deviceInfo = (CaptureDeviceInfo) CaptureDeviceManager.getDeviceList(new AudioFormat(AudioFormat.LINEAR, 44100, 16, 1)).get(0);
DataSource inSource=Manager.createDataSource(deviceInfo.getLocator());
if(inSource.equals(null)) {System.out.println("DataSource Not detected");   }
why inSource is never null?
how can we notify the user when no data is captured?
thx

Answer 1

I wanted to add that even with this code handling exceptions, exceptions are not displayed even if the microphone is not connected!
CaptureDeviceInfo deviceInfo = (CaptureDeviceInfo) CaptureDeviceManager.getDeviceList(new AudioFormat(AudioFormat.LINEAR, 44100, 16, 1)).get(0);
DataSource inSource = createDataSource(deviceInfo.getLocator());
protected DataSource createDataSource(MediaLocator locator)
try {
try {
return Manager.createDataSource(locator);
catch (NoDataSourceException ex) {
     {System.out.println("NoDataSourceException: "+ex);
//The failure only concens us
return null;
catch (IOException ex) {
     System.out.println("IOException: "+ex);
//The failure only concens us
return null;
finally {
please help if you have an answer