On both systems, however, deleting the file does not necessarily make the file go away, it still occupies space on the disk as long as there is still an open handle to it. Space occupied by the file is only released when the last open handle is closed. That it is necessary to specify the flag on Windows makes it seem to most people that Windows cannot delete open files, but that's actually not true. That's just the default behaviour.
CreateFile :. If this flag is not specified, but the file or device has been opened for delete access, the function fails. Note Delete access allows both delete and rename operations. DeleteFile :. The DeleteFile function marks a file for deletion on close. Therefore, the file deletion does not occur until the last handle to the file is closed. Having an open handle to a file with no name is one of the most typical methods of creating unnamed temporary files: Create a new file, open it, delete the file.
You now have a handle to a file that nobody else can open. On Unix, the filename is truly gone and on Windows you cannot open a file with the same name. Does Files. Looking at the source , you can see that shareDelete indeed defaults to true. The answer to that is hidden in the documentation of DeleteFile above: The file is only marked for deletion, the file is still there.
On Windows, you cannot create a file with the name of a file marked for deletion until the file is properly deleted, i. The possible confusion of mixing name deletion and actual file deletion is probably why Windows disallows deleting open files by default in the first place.
In detail: Java code calls FileSystemProvider. From what I can tell, this is the path taken when you call Files. There is also another code path that calls GetFileAttributeEx to retrieve file attributes.
Once again, it is not documented what happens when you try to retrieve the attributes of an deleted but not yet removed file, but indeed, you cannot retrieve the file attributes of a file marked for deletion. So indeed, after DeleteFile the file is gone for most practical purposes.
It still has a name, however, shows up in directory listings and you cannot open a file with the same name until the original file had all its handles closed. This behaviour is more or less consistent, because using GetFileAttributes to check if a file exists is a actually an file accessibility check, which is interpreted as file exists. FindFirstFile used by Windows Explorer to determine the file list finds file names but tells you nothing about accessibility of the names.
If Files. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Odd behaviour when deleting Files with Files. Asked 6 years, 5 months ago. Active 1 year ago. Viewed 13k times.
Please consider the following example Java class pom. ByteArrayInputStream; import java. IOException; import java. InputStream; import java. Java 'file. Asked 11 years ago. Active 1 year, 4 months ago. Viewed k times. Kimberley Lloyd Kimberley Lloyd 1 1 gold badge 5 5 silver badges 7 7 bronze badges. What environemnt: Unix or Windows? Are any exceptions thrown?
What is the return value of the file. Also remember to close any possible programs that could have the file open in it.
I was trying to delete a db while it was open in a db browser. If this is under Windows, it is because the file is open or mmap'd. Windows locks open files, and then File::delete cannot delete them. Show 1 more comment. Active Oldest Votes. Same concept, but I found that I had to close input streams. This was the last I could think of, but you are right Closing the file correctly not just flush resolves the issue.
Add a comment. Be sure to find out your current working directory, and write your filepath relative to it. Yassin Hajaj Goran Jovic Goran Jovic 9, 3 3 gold badges 41 41 silver badges 74 74 bronze badges. And contrary to popular opinion, forward slashes do work on Windows. Just don't expect Windows to return paths with forward slashes. Community Bot 1 1 1 silver badge.
Maha Maha 1 1 silver badge 2 2 bronze badges. I suspect that the problem is that the path is incorrect. My unproven suspicion is that virus checkers on Windows lock the file to examine the file and waiting allows the virus checker to finish.
Use Files. Maybe you can use System. This may be somehow platform dependent, but the command to be entered to the exec function may differ among os properties. How do I programmatically determine operating system in Java? Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Failed to delete a file in Windows using Java Ask Question. Asked 5 years, 1 month ago. Active 8 months ago. Viewed 7k times. So what am I missing here? Update: By using Files. You could try to use Files. I have updated the question with the exception that I got. On Windows you cannot delete a file where anybody including your own process has a file handle open.
This is different from Unix where you can always delete it and even use the open file descriptors afterwards. What you can do if it is a temp file which should be deleted you can use deleteOnExit, this might work as long as your process is the only one having open filedescriptors. Yes in your sample the file is closed before it gets deleted. Show 2 more comments. Active Oldest Votes. Welcome to Windows.
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