Kotlin: Unresolved reference: java

Question

I surprised, because i was able to checkout and run a Kotlin project from Github without this error, and now get get this Java-Error

I using

kotlinc-jvm 1.3.60 (JRE 11.0.4+10-b520.11),
IDEA 2019.3,
Kernel: 5.3.15-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.2.0 Desktop: Xfce 4.14.1 Distro: Manjaro Linux

i tried hit Alt+Enter. IDE manual says: "Alt+Enter: Show intention actions and quick-fixes."

This is my File-Name:

/home/me/IdeaProjects/KeyEvent-Reader-Demo/src/Test.kt

Do you have JDK configured for project/module in "Project Structure"? — y.bedrov
– y.bedrov, Commented Dec 13, 2019 at 11:05
hmm. i see no misconfiguration here: imgur.com/JJ3be9q.png , imgur.com/SNJ4yuJ.png — SL5net
– SL5net, Commented Dec 13, 2019 at 11:15
Looks like classpath for JDK 11 is empty. Please try to recreate JDK item in IDE. — y.bedrov
– y.bedrov, Commented Dec 16, 2019 at 9:14

andras · Accepted Answer · 2023-07-16 17:34:27Z

10

I had the same problem, the @y.bedrov's suggestion helps me.

The issue is that the Classpath is empty (under Project Structure -> Platform Settings -> SDKs -> <choose active SDK> -> Classpath)

To fix this, you can recreate the SDK:

Project Structure -> Platform SDKs -> <choose active SDK> -> "-"
Project Structure -> Platform SDKs -> "+" -> <choose target SDK location>

andras

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answered Mar 2, 2020 at 10:06

PavelPraulov

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1 Comment

This suprisingly worked. FYI, I did this with a JDK11 openjdk build on windows.

chujudzvin · Accepted Answer · 2022-08-04 15:47:06Z

This was definitely some IntelliJ peoblem for me. I could solve the issue by stupidly deleting the "problematic" class and creating it again:

What generally people also suggest when having similar problem (but didn't help in my case):

Restart IDE (File -> Invalidate caches... )
Check Platform SDKs as mentioned in another answer here
IntelliJ -> PReferances -> Build, Execution, Deployment -> Make sure that Kotlin Compiler and Java Compiler match in versions.