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How to Fix Java File Outside of Source Root Error in IntelliJ for Spring Boot Projects?

To fix the "Java file outside of source root" error in an IntelliJ Spring Boot project, you must correctly designate your source code directory. The most common solution is to navigate to your project's `src/main/java` folder in the Project view, right-click on it, and select `Mark Directory as -- Sources Root`. The directory's icon should turn blue, indicating IntelliJ now recognizes it as a source folder. If this doesn't resolve the issue, the project's build configuration may be out of sync. For Maven or Gradle projects, open the corresponding tool window (View -- Tool Windows -- Maven/Gradle) and click the "Reload All Projects" button. This forces IntelliJ to re-read your `pom.xml` or `build.gradle` file and correctly re-configure the project structure, including the source roots. As a final resort, if the problem persists, use `File -- Invalidate Caches / Restart` to clear any corrupted IDE state and re-index the project from scratch.

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