在Java 9中取消mmapped文件映射的最佳方法是什么

import sun.misc.Cleaner;
import java.lang.reflect.Field;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

public class MappedByteBufferExample {
    public static void main(String[] args) throws Exception {
        Path filePath = Paths.get("path/to/file");
        FileChannel fileChannel = FileChannel.open(filePath, StandardOpenOption.READ, StandardOpenOption.WRITE);
        MappedByteBuffer mappedByteBuffer = fileChannel.map(FileChannel.MapMode.READ_WRITE, 0, fileChannel.size());

        Field cleanerField = mappedByteBuffer.getClass().getDeclaredField("cleaner");
        cleanerField.setAccessible(true);
        Cleaner cleaner = (Cleaner) cleanerField.get(mappedByteBuffer);
        cleaner.clean();

        fileChannel.close();
    }
}