Java I / O - 尝试打开已写入的文件时抛出的java.nio.file.NoSuchFileException

Question

我在java程序中遇到过I / O问题。我的程序在Linux下使用Java 7和Tomcat 7。线程1创建一个对象并使用JAXB将其序列化为文件：

public static void export1(JAXBContext context, Object object, Path filePath){
    try {
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
        marshaller.marshal(object, filePath.toFile());
    } catch (JAXBException e) {
        throw new RuntimeException(e);
    }
}

然后向外部实体发送通知。处理传入请求的线程遇到：

Caused by: java.nio.file.NoSuchFileException: PATH_TO_FILE
    at sun.nio.fs.UnixException.translateToIOException(Unknown Source)
    at sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
    at sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
    at sun.nio.fs.UnixFileSystemProvider.newByteChannel(Unknown Source)
    at java.nio.file.Files.newByteChannel(Unknown Source)
    at java.nio.file.Files.newByteChannel(Unknown Source)

我已阅读一些关于I/O concept flush vs sync的帖子，但我仍感到困惑。将我的代码重构为使用无缓冲输出流的下一个代码解决我的问题吗？

public static void export2(JAXBContext context, Object object, Path filePath){
    try (OutputStream os = Files.newOutputStream(filePath)) {
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
        marshaller.marshal(object, os);
    } catch (JAXBException | IOException e) {
        throw new RuntimeException(e);
    }
}

或者我应该直接使用文件描述符来同步OS缓冲区与底层设备吗？

public static void export3(JAXBContext context, Object object, Path filePath) {
    try (FileOutputStream fos = new FileOutputStream(filePath.toFile())) {
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
        marshaller.marshal(object, fos);
        fos.getFD().sync();
    } catch (JAXBException | IOException e) {
        throw new RuntimeException(e);
    }
}