Why Isn\'t IntelliJ IDEA Detecting Errors in My Java Files?

Auto Errors Detection in IntelliJ IDEA: Troubleshooting Missing Detections

As a novice programmer using IntelliJ IDEA 2017.1, you may encounter situations where the IDE fails to detect errors despite having inspections enabled. This issue arises when your Java file resides outside the designated "source root."

A source root defines the directory where IntelliJ IDEA expects to find code files. When a file is located outside this root, the IDE cannot analyze its contents for errors. To resolve this issue, you have two options:

Option 1: Relocate the Java File

Move your Java file into the directory that has been configured as the source root. In the project tree view, this directory is typically marked with a blue square containing a class icon.

Option 2: Reconfigure Content Roots

If it is not feasible to relocate your file, you can modify the content roots to include your current file location. To do this:

• Open your project settings (File > Project Structure).
• Navigate to the "Project" tab.
• Under "Project Structure," adjust the "Content Roots" section to include the folder containing your Java file.

Once you have ensured that your Java file resides within the source root, IntelliJ IDEA will be able to analyze its contents for errors and provide appropriate inspections.

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