IDEA suddenly stopped detecting the JDK
Answered
I've been working on Java projects on IDEA for a while. Yesterday it suddenly stopped detecting the installed JDK.
The errors show up like so: https://i.imgur.com/UEXb1fM.jpg
As you can see, the project settings are set properly and I have not changed anything at all: https://i.imgur.com/elTH9QT.jpg
As a final comment, I re-installed Netbeans to test if this was a problem with IDEA or the actual JDK (even though there were no changes to it) and it works fine there.
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Remove JDK configuration in IntelliJ IDEA and add it again.
Also try File | Invalidate Caches | Invalidate and Restart.
The 'Invalidate Caches' option worked. Thanks.