IntelliJ出现java.io.FileNotFoundException(.cache文件)致无法编译问题咨询

Hey there, I totally get how frustrating it is when a previously working IntelliJ project suddenly throws this error and blocks compilation. Let’s walk through the most common causes behind this issue:

• Corrupted or missing cache files
  IntelliJ relies heavily on its cache to speed up compilation and indexing. If your system crashed unexpectedly, the disk had an error, or even an overzealous antivirus tool deleted the .cache files, IntelliJ won’t be able to locate them. This is the most frequent culprit—caches can get corrupted easily if the IDE isn’t shut down properly.

• Permission issues
  If you’ve recently changed user accounts, updated your OS, or modified folder permissions, IntelliJ might no longer have read/write access to the .cache files. For example:

  • On Linux/macOS, the cache files might now be owned by root instead of your user account.
  • On Windows, the project folder or .idea/caches directory could have been marked as read-only.

• Insufficient disk space
  When your disk (or the partition where IntelliJ stores its cache) is full, the IDE can’t create or update the .cache files it needs. Even if you think you have space left, check for hidden system files, restore points, or large temporary files that might be eating up storage.

• Corrupted project configuration
  The .idea folder in your project stores critical configuration data. If files like workspace.xml or caches.xml get corrupted, IntelliJ might be pointing to an invalid path for the .cache files, leading to the not-found error.

• Plugin or IDE version conflicts
  If you recently updated IntelliJ IDEA or installed a new plugin, the old cache files might not be compatible with the new version. Plugins sometimes modify cache structures, and outdated caches can’t be recognized by the updated IDE.

Quick Fixes to Try First #

1. Go to File > Invalidate Caches... and select Invalidate and Restart—this clears all IntelliJ caches and rebuilds them from scratch.
2. Manually delete the .idea/caches folder in your project, then restart IntelliJ.
3. Check that your project folder has read/write permissions for your user account.
4. Verify you have enough free disk space on the drive where your project and IntelliJ cache are stored.

内容的提问来源于stack exchange，提问作者Manu Chadha