I've just upgraded to latest IDEA and Kotlin plugin v 1.4.20 and I m getting "Cannot access class java.io.File" or "Cannot access class java.net.URI" in the build scripts across the whole project. Has anyone experienced that?

Check in the IDE settings that there are no old or incorrect JDK entries. Afterwards clear IDE cache & restart

can you be a bit more specific please what do you mean by "old JDK entries"? we are using JDK 1.8 in our project

File > Project Structure > Project > Project SDK > Edit

Mhh looks good 😕 Then the only idea I’ve left is clearing IDE caches & restart

When I switch to JDK 14 in the Gradle settings, then the problems are gone, but our project doesn't compile with JDK14 coz we depend on some old Xml bind stuff 🙄

Maybe it’s an issue with Open JDK? 🤔

hm, I did clean cache and restart plus reimport of the gradle project.. it took some time but I m back where I was

Yeah that issue pops up often with IDE/Kotlin updates

Alright, thanks a lot mate, I upgraded the OpenJDK from 252 to 273 and it works now

Hmm, I have the same problem with jdk15. I'll try to invalidate the cache..