How to Fix "IntelliJ IDEA Not Showing Errors in Code"

If IntelliJ IDEA is not showing errors in your code, it could be caused by incorrect project configuration, invalidated caches, or IntelliJ not properly indexing your project files.

Here’s how to fix this issue: Start by checking if the code inspections are enabled.

In IntelliJ IDEA, go to File > Settings > Editor > Inspections and ensure that the necessary inspections are enabled for the programming language you're working with.

For example, make sure that Java or Kotlin inspections are turned on if you’re working with those languages.

If inspections are enabled but errors still aren't showing, it might be an issue with IntelliJ's indexing.

Try invalidating the caches by going to File > Invalidate Caches / Restart, then selecting Invalidate and Restart.

This will clear any corrupted data in IntelliJ and force it to reindex your project.

Another possible cause for missing error messages is a misconfigured project SDK.

Go to File > Project Structure > Project, and check whether the correct SDK is selected for your project.

If the SDK is not set up correctly, IntelliJ won’t be able to detect errors in your code.

If everything appears to be in order but errors still aren’t showing, check whether your file types are properly configured.

Go to File > Settings > Editor > File Types, and make sure that the correct file types are selected for your project files.

This ensures that IntelliJ treats the files as the appropriate language and applies the corresponding error checks.

Finally, if you're using a version control system like Git, ensure that your files are not excluded from analysis due to .gitignore rules or other version control configurations.

You can check for excluded files in File > Settings > Version Control > Ignored Files.

By following these steps, IntelliJ IDEA should display errors in your code as expected.