code: @Override
      public ClassLoader getClassLoader(JavaFileManager.Location location) {
          proc.debug(DBG_FMGR, "getClassLoader: location\n", location);
          return stdFileManager.getClassLoader(location);
      }
docs: Returns a class loader for loading plug-ins from the given location. For
  example, to load annotation processors, a compiler will request a class
  loader for the {@link
  StandardLocation#ANNOTATION_PROCESSOR_PATH
  ANNOTATION_PROCESSOR_PATH} location.
  
  @param location a location
  @return a class loader for the given location; or {@code null}
  if loading plug-ins from the given location is disabled or if
  the location is not known
  @throws SecurityException if a class loader can not be created
  in the current security context
  @throws IllegalStateException if {@link #close} has been called
  and this file manager cannot be reopened