What does this symbol mean in IntelliJ? (red circle on bottom-left corner of file name, with 'J' in it)

Question

Under the target folder in IntelliJ for a Java project I created, I have a few java source files in the package. Beside each file the \'J\' icon has a red circle with a lin

Answer 1

It means your Java source files aren't part of the project.

If the suggestions mentioned here don't resolve the issue, you may have hit a rare bug like I did. Researching the exceptions found in the log helped me. In my case, disabling the "Plugin DevKit", deleting the .idea directory, and reimporting the project worked.

Answer 2

mark the java folder as source root.It will solve.

Answer 3

For a gradle project "./gradlew --stop" will help to resolve the problem when the source directory is correctly specified and project is properly synced.

Answer 4

As mentioned earlier,

1. right click on the pom.xml

2. Add As Maven Project

Answer 5

This is what worked for me

1. Press File from the toolbar
2. Press Sync Project with Gradle Files

Answer 6

You need to specify the source dir

File> Project Structure > Modules

click the directory and click the Sources button

It's weird because usually it's done automatically. Maybe it's better if you recreate the project again.