code: public static FileChannel newFileChannel(Closeable ioObject, FileDescriptor fd, int mode) {
        ChannelFactory factory = ChannelFactory.INSTANCE;
        if (factory == null) {
          throw new LibraryNotLinkedError("Channel support", "jre_channels",
              "JavaNioChannelFactoryImpl");
        }
        return factory.newFileChannel(ioObject, fd, mode);
      }
docs: Helps bridge between io and nio.