code: @Override
  	public void onManagerWarning(String warning, Exception cause) {
  		if (warning != null) {
  			System.err.println(DEBUG_PREFIX + "Simon warning: " + warning);
  		}
  		if (cause != null) {
  			System.err.print(DEBUG_PREFIX);
  			cause.printStackTrace();
  		}
  	}
docs: Warning and stack trace are print out to the error output. Either cause or warning
  (or both) should be provided otherwise the method does nothing.
  <p/>
  {@inheritDoc}