code: public void changeLogger(final String name, final String levelStr, boolean parent) throws IllegalArgumentException
  	{
  		Level level = getLevel(levelStr);
  		changeLogger(name, level, parent);
  	}
docs: changes the level of an logger
  
  @param name logger name
  @param levelStr level as string
  @param parent if the logger is a parent logger
  @throws IllegalArgumentException