Скачать или смотреть Resolving the Not Found Exception in Java's Temporary File Paths on Windows

Discover how to tackle the issue of shortened file paths in Java temp directories that throw 'Not Found' exceptions on Windows. Learn the solution and tips to prevent similar problems.
---
This video is based on the question https://stackoverflow.com/q/68722552/ asked by the user 'Eivyses' ( https://stackoverflow.com/u/8452082/ ) and on the answer https://stackoverflow.com/a/68725602/ provided by the user 'Eivyses' ( https://stackoverflow.com/u/8452082/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Java creates temp folder with shortened path and throws 'Not found' exception when trying to access files placed in it

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving the Not Found Exception in Java's Temporary File Paths on Windows

Encountering errors while developing applications can be incredibly frustrating, especially when they are related to file paths. A common issue developers face is Java creating temporary directories and files with shortened paths that result in a File Not Found exception. This post will delve into the problem, its root causes, and the practical solutions available.

The Problem: Shortened Paths Lead to Errors

When using Java methods such as File.createTempDir() or Files.createTempDirectory(prefix), you might find that the temp files are generated within your Windows system's AppData directory, but the paths are considerably shortened. For instance, instead of a full path like:

[[See Video to Reveal this Text or Code Snippet]]

you end up with something like:

[[See Video to Reveal this Text or Code Snippet]]

What Happens Next?

This shortened path triggers a File Not Found exception, as the file explorer will also struggle to recognize the truncated path format. The workaround might require you to manually change the shortened path to its full version, but this is not practical when automating processes in Java applications.

Finding a Solution

After some troubleshooting and investigation, there is good news! Java provides a method named Path.toRealPath(), which effectively resolves the shortened paths, allowing you to access your temporary files without encountering errors.

Steps to Resolve the Issue:

Use Path.toRealPath() Method: This method resolves the path to its canonical form, eliminating the shortened version.

Here’s how you can implement this in your Java code:

[[See Video to Reveal this Text or Code Snippet]]

Check for Compatibility Issues: In some cases, the underlying problem might not stem from Java, but from external libraries that interact with Java. It’s essential to verify:

Whether your libraries are up-to-date.

If there are any reported bugs related to file handling.

Operating System Settings: Windows allows configurations that might affect file path lengths:

Ensure you have enabled the NTFS long paths policy in Windows, although this might not resolve the shortened paths entirely.

Conclusion

By understanding the cause of the Not Found exceptions related to shortened paths and employing the Path.toRealPath() method, you can effectively resolve this issue in your Java applications. Always stay updated with the libraries you use, as bugs in those can lead to unexpected behavior.

With this knowledge, you can now better manage file handling in Java and avoid future pitfalls when dealing with temporary file paths. Happy coding!