code: protected String createExceptionMessage(Throwable exception, Request request, Response response)
      {
  		StringBuilder sb = new StringBuilder(request.getEffectiveHttpMethod().toString());
  		sb.append(' ');
  		sb.append(request.getUrl());
  		sb.append(" threw exception: ");
  		sb.append(exception.getClass().getSimpleName());
  		return sb.toString();
      }
docs: Create the message to be logged when a request results in an exception.
  Sub-classes can override.
  
  @param exception the exception that occurred.
  @param request the request.
  @param response the response.
  @return a string message.