java - How to fix IntelliJ IDEA's SDK after it got "corrupted" that leads to "{class} cannot be found"?

asked Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

Due to a separate issue in intellij (adding python module corrupts scala/java project), I need to revive/fix the scala/java SDK.

As can be seen in first screenshot even basic java classes e.g.

IllegalArgumentException

can not be found

But the SDK is already present/not missing (as shown in second screenshot). I have already done

File | Invalidate caches.

That did not help.

So .. how to reset / clean INtellij SDK's after it got confused/corrupted?

I am using 13.1.5 ultimate.

enter image description here

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