code: public static Resource toResourceExisting(PageContext pc, String path) throws ExpressionException {
  	return toResourceExisting(pc, path, pc.getConfig().allowRealPath());
      }
docs: cast a String (argument destination) to a File Object, if destination is not a absolute, file
  object will be relative to current position (get from PageContext) file must exist otherwise
  throw exception
  
  @param pc Page Context to the current position in filesystem
  @param path relative or absolute path for file object
  @return file object from destination
  @throws ExpressionException