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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under target folder in intellij java project created, have few java source files in package. beside each file 'j' icon has red circle line through it.

what mean? how fix it?

you need specify source dir

file> project structure > modules

click directory , click sources button

it's weird because it's done automatically. maybe it's better if recreate project again.


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