code: public static void setLogFilterByClassName(String className) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
          Preconditions.checkArgument(className == null, "className == null");
          LogFilter logFilter = createLogFilterByClassName(className);
          setLogFilter(logFilter);
      }
docs: Set the active <code>LogFilter</code> by class name. If the parameter is <code>null</code>
  then an exception is thrown. Otherwise if an instance cannot be constructed, then an instance
  of class {@link NullLogFilter} is used instead.
  
  @param className
  the name of the {@link LogFilter} class to use, cannot be <code>null</code>.