File path java io ioexception

What are possible reasons for java.io.IOException: «The filename, directory name, or volume label syntax is incorrect»

Filename and directory name seem to be correct. The directory targetPath is even checked for existence before the copy code is executed and the filename looks like this: AB_timestamp.xml The user has write permissions to the targetPath and can copy the file without problems using the OS. As I don’t have access to a machine this happens on yet and can’t reproduce the problem on my own machine I turn to you for hints on the reason for this exception.

14 Answers 14

This can occur when filename has timestamp with colons, eg. myfile_HH:mm:ss.csv Removing colons fixed the issue.

This worked for me. SAP HANA was using this method to create a log file and the colons in my table names were causing the method to fail

Try this, as it takes more care of adjusting directory separator characters in the path between targetPath and filename:

File targetFile = new File(targetPath, filename); 

I just encountered the same problem. I think it has to something do with write access permission. I got the error while trying to write to c:\ but on changing to D:\ everything worked fine. Apparently Java did not have permission to write to my System Drive (Running Windows 7 installed on C:)

Agreed. I was getting the same error when referring to a file at C:\Users\user\Desktop. but when moved the file to C:\temp the issue was resolved, hence certainly can be permission related problem.

Here is the test program I use

import java.io.File; public class TestWrite < public static void main(String[] args) < if (args.length!=1) < throw new IllegalArgumentException("Expected 1 argument: dir for tmp file"); >try < File.createTempFile("bla",".tmp",new File(args[0])); >catch (Exception e) < System.out.println("exception:"+e); e.printStackTrace(); >> > 

You should open a new question for your problem if working through the answers on this question does not help you. It is unlikely that you get an answer if you post your question as an answer to this question.

Remove any special characters in the file/folder name in the complete path.

Please add some more explanation about how to do this. The OP stated «I don’t have access to a machine», and that was more than ten years(!) ago

Try to create the file in a different directory — e.g. «C:\» after you made sure you have write access to that directory. If that works, the path name of the file is wrong.

Take a look at the comment in the Exception and try to vary all the elements in the path name of the file. Experiment. Draw conclusions.

Do you check that the targetPath is a directory, or just that something exists with that name? (I know you say the user can copy it from the operating system, but maybe they’re typing something else).

Does targetPath end with a File.separator already?

(It would help if you could log and tell us what the value of targetPath and filename are on a failing case)

Maybe the problem is that it is copying the file over the network, to a shared drive? I think java can have problems when writing files using NFS when the path is something like \mypc\myshared folder.

What is the path where this problem happens?

Try adding some logging to see exactly what is the name and path the file is trying to create, to ensure that the parent is well a directory.

In addition, you can also take a look at Channels instead of using a loop. 😉

You say «for some users» — so it works for others? What is the difference here, are the users running different instances on different machines, or is this a server that services concurrent users?

If the latter, I’d say it is a concurrency bug somehow — two threads check try to create the file with WinNTFileSystem.createFileExclusively(Native Method) simultaniously.

Neither createNewFile or createFileExclusively are synchronized when I look at the OpenJDK source, so you may have to synchronize this block yourself.

Maybe the file already exists. It could be the case if your timestamp resolution is not good enough. As it is an IOException that you are getting, it might not be a permission issue (in which case you would get a SecurityException).

I would first check for file existence before trying to create the file and try to log what’s happening.

Look at public boolean createNewFile() for more information on the method you are using.

The API actually says that it won’t throw an IOException if the file already exists but simply returns false in this case.

As I was not able to reproduce the error on my own machine or get hands on the machine of the user where the code failed I waited until now to declare an accepted answer. I changed the code to the following:

File parentFolder = new File(targetPath); . do some checks on parentFolder here . File targetFile = new File(parentFolder, filename); targetFile.createNewFile(); fileInputStream = new FileInputStream(fileToCopy); fileOutputStream = new FileOutputStream(targetFile); byte[] buffer = new byte[64*1024]; int i = 0; while((i = fileInputStream.read(buffer)) != -1)

After that it worked for the user reporting the problem.

So it seems Alexanders answer did the trick — although I actually use a slightly different constructor than he gave, but along the same lines.

I yet have to talk that user into helping me verifying that the code change fixed the error (instead of him doing something differently) by running the old version again and checking if it still fails.

btw. logging was in place and the logged path seemed ok — sorry for not mentioning that. I took that for granted and found it unnecessarily complicated the code in the question.

Thanks for the helpful answers.

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file.createNewFile() gives java.io.IOException: Not a directory

I have already checked that parent directories exist and since I am using an emulator that runs on API 29, getExternalFilesDir should not require permission to read and write to. But I am unsure as to why I am getting this exception since I should be able to create a new File inside another File as per this link. Here is the stack trace:

 Caused by: java.io.IOException: Not a directory at java.io.UnixFileSystem.createFileExclusively0(Native Method) at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:317) at java.io.File.createNewFile(File.java:1008) at com.example.camera.presentation.CameraViewModel.saveImage(CameraViewModel.kt:68) at com.example.camera.presentation.CameraFragment$takePhoto$1.onImageSaved(CameraFragment.kt:167) at androidx.camera.core.ImageCapture$3.onImageSaved(ImageCapture.java:661) at androidx.camera.core.ImageSaver.lambda$postSuccess$0$ImageSaver(ImageSaver.java:253) at androidx.camera.core.-$$Lambda$ImageSaver$-JRZLUaKK7DQ1iBdZ_1qTGbYQrk.run(Unknown Source:4) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

 fun saveImage(IdNumber: Int, photoFile: File, plantType: Int) < val newImage = PlantPhoto(IdNumber, "ZZ Plant", photoFile, plantType) val dataClassLocation = File(context.getExternalFilesDir("planio/dataclasses/$/$IdNumber").toString()) if (!dataClassLocation.exists()) < try < dataClassLocation.parentFile.mkdirs() dataClassLocation.createNewFile() >catch (e: IOException) < e.printStackTrace() >> val plantFile = FileOutputStream(dataClassLocation, true) val outStream = ObjectOutputStream(plantFile) // Method for serialization of object outStream.writeObject(newImage) outStream.close() plantFile.close() Log.i(SaveTag, "Image saved successfully") > 

And now I am getting a new java.io.FileNotFoundException: planio/dataclasses/1/filename: open failed: ENOENT (No such file or directory)

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Java Path exception

So, I used java.io.File for basically everything before. But now, when switching to java.nio.Path, I’m experiencing a few problems. What I use it for is basically loading/saving files, on my program startup and shutdown. I use it in multiple places but I’ll type an example:

 Objects.requireNonNull(directory, "directory"); if (this.myObjectMap.isEmpty()) < return; >Files.list(directory).forEach(file -> < try < Files.deleteIfExists(file); >catch (IOException exception) < exception.printStackTrace(); >>); Files.createDirectories(directory); for (Object object : this.myObjectMap.values())

My problem is that everytime I do something similar to this, it throws a NoSuchFileException exception before even using the Path. But I don’t know what I’m doing wrong, since I check if it exists after creating the Path. Update The exception stacktrace is the following:

java.nio.file.NoSuchFileException: **the directory** at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79) at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102) at sun.nio.fs.WindowsDirectoryStream.(WindowsDirectoryStream.java:86) at sun.nio.fs.WindowsFileSystemProvider.newDirectoryStream(WindowsFileSystemProvider.java:518) at java.nio.file.Files.newDirectoryStream(Files.java:457) at java.nio.file.Files.list(Files.java:3451) 

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Writing to a file in Java: Cannot find the path specified

I am having enormous difficulty writing to a simple text file in Java. Every search I’ve done for the IO exception I’m getting is turning up plenty of suggestions, but none of them apply to this situation. Here is my project structure:

MyEclipseProject/ src/ com.myprogram.utils MyProgram bin/ 

package com.myprogram.utils; import java.io.FileWriter; public class MyProgram < public static void main(String[] args) < FileWriter oWriter = new FileWriter(new File("logs/system.log")); oWriter.write("This never gets logged because JRE can't find the file"); >> 

The exception message I’m getting states: logs\system.log (The system cannot find the path specified). The first time I tried, I did so without having first created the logs/ directory and its subsequent log file. My understanding was that, if Java couldn’t find the file, it would create it for you. I have now placed a logs folder — with a blank system.log file — inside: (1) my project root ( MyEclipseProject ), (2) the src/ folder, (3) the src/com.myprogram.utils package, and (4) the bin folder, and I am getting the same exact error. I’m wondering: could I have an OS/persmissions thing going on? Could my app be trying to create the folder and log file but be getting denied permission to do so by Windows 7? If so, what do I do. If not, where in tarnation do I place logs/system.log . Thank you for any clarity to this!

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Java IOException, file path strangeness

I’m getting the java.io.IOException: The filename, directory name, or volume label syntax is incorrect and I can’t see why. If I try my code directly with a string, it works (folder exists, permissions ok, etc.) When I try to build the string from an array, it fails with the exception above. Here’s the code, with commented lines that I’ve tried that fail and what works as well as what the println output is:

 // ////////////////////////////////////////////////////////////////// // Create a file chooser and select a directory JFileChooser fc = new JFileChooser(); fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); fc.setAcceptAllFileFilterUsed(false); int rVal = fc.showOpenDialog(MyApp.this); if (rVal == JFileChooser.APPROVE_OPTION) < dlDirectory = fc.getSelectedFile().toString() + "\\"; System.out.println("Selected Directory: " + dlDirectory); >else < System.out.println("No Selection"); >. . (I create a string array of file names here) . for (int i = 0; i < filesToRetrieve.length; i++) < //put together the directory and file name String dlFileName = (dlDirectory + filesToRetrieve[i]); try < System.out.println(dlDirectory); // output: C:\Users\michael\Documents\tmp\ (as expected) System.out.println(filesToRetrieve[i]); // output: nameoffile.txt (as expected) System.out.println(dlFileName); // output: C:\Users\michael\Documents\tmp\nameoffile.txt (as expected) File myFile = new File(dlFileName); //> catch (Exception e) < System.err .println("failed"); System.err.println(e); >> 

@Mob , yes he is, dlFileName is dl directory from file choser and + \\ + filename, it’s just print to console with \

@EJP Welcome to windows development, here is you can use / and \\ :), BTW, he can try create file as I wrote below

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