code: public String processCommandLine(String commandLine) {
  		StringBuffer response = new StringBuffer();
  		try {
  			response.append(super.processCommandLine(commandLine));
  		} catch (Throwable t) {
  			response.append(StringSupport.getStackTrace(t, 5) + "\n");
  		}
  		return response.toString();
  	}
docs: Processes a client command line.
  The response consists of a few lines.
  The first line is either 'OK' or an 'ERROR',
  followed by the result.toString() or respectively
  an error message.
  Collections are printed as a series of lines prifixed by dashes.
  
  @param commandLine
  @return