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 line through it   What does that mean   How do I fix it

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It means those files aren t part of the project settings

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The first answer from irreputable above that starts out with  you need to specify the source dir  is correct  but I don t see him telling you the easy way to do so   Simply right click on the java sources folder   java  under src main java if it is a Maven project for example  and select Mark Directory As   Sources Root  see screenshot below

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

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First mark the directory as the source root  Then go to the pom excel and right click on it  select add as maven project

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You need to specify the source dir  File gt  Project Structure  gt  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

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This is what worked for me   Press File from the toolbar Press Sync Project with Gradle Files

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This was killing me as I had the same issue  I just going over old projects  Really redoing old lessons from class to get more practice  The repos just have compatibility issues  So I import the project  Then add the source like others state  Then close the project  Delete the  idea directory in the root and re-import project

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Actually this can happens because of two reason     Your project not getting  Updating your dependencies  Go to your terminal and enter mvn clean install  Or right click on pom xml and click Add as Mevan Project   Check your jdk has set properly to the project

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Press F4 at the project root and select the the root source pressing the source button  It resolved my problem   for         makeGoodCode

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If it is a maven project    right click on the pom xml Add As Maven Project   Thanks

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As mentioned earlier     right click on the pom xml      Add As Maven Project

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Another option if you re using Flavors in Android Studio   Click Build -  Select Build Variant    In the list click the variant you re working in and it will turn green and the others will have the red J

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Maybe your project has not been as android project by android studio  please make sure that plugin  android support  has been enabled Android Studio Preferences -  Plugins -  Select Android Support

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I downloaded a project from github with  idea folder  After deleting that folder  everything was ok

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This situation happens when the IDE looks for src folder  and it cannot find it in the path  Select the project root  F4 in windows    Go to Modules on Side Tab   Select Sources   Select appropriate folder with source files in it  Click on the blue sources folder icon  for adding sources    Click on Green Test Sources folder   to add Unit test folders

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Find all IntelliJ  v15  symbols over here  https   www jetbrains com idea help symbols html  This site states that this icon stands for  Java class located out of the source root  Refer to the section Configuring Content Roots for details

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mark the java folder as source root It will solve

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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

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Close Android Studio and delete  idea and  gradle folder from project structure and start Studio again

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

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