nio.channels.FileChannel.open 抛出 NoSuchFileException

Question

I have a microservice that is working fine most of the times. Recently it threw a NoSuchFileException exception when it was opening a file to write:

    FileChannel.open(Paths.get("/tmp/somethingirrelevant"), StandardOpenOption.CREATE, StandardOpenOption.APPEND);

I don't understand why it can throw such exception, considering that it will create a new one if it doesn't exist.

Answer 1

One scenario where NoSuchFileException is thrown is when an intermediate path component does not exist:

FileChannel.open(Paths.get("/tmp/does/not/exist"), StandardOpenOption.CREATE, StandardOpenOption.APPEND);

The CREATE option only creates the file, it does not create the directories that should contain the file.