code: public static boolean fileExists(final File target) {
          return AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
              @Override
              public Boolean run() {
                  return target.exists();
              }
  
          });
      }
docs: Execute the {@link File#exists()} from within a {@link PrivilegedAction}.
  
  @param target
  @return