How do I resolve this error please "Kotlin: [Internal Error] java.lang.ExceptionInInitializerError"

Question

fun main() {
    fun convert(x: Double, converter: (Double) -> Double) : Double{
        val result = converter(x)
        println("$x is converted to $result")
        return result
    }
    fun convertFive(converter: (Int) -> Double) : Double {
        val result = converter(5)
        println("5 is converted to $result")
        return result
    }

    convert(20.0) { it * 1.8 + 32}
    convertFive { it * 1.8 + 32 }
}

// i got this error when i updated my intelliJ Idea and ran this //

Kotlin: [Internal Error] java.lang.ExceptionInInitializerError

Can you kindly post the rest of the error? It may be that you need to update your Java, Kotlin, or gradle versions — Luke Needham
– Luke Needham, Commented Mar 26, 2021 at 10:20
There is no problem with the code in the question. (It compiles and runs fine in my IntelliJ.) It must be a problem with your set-up. — gidds
– gidds, Commented Mar 26, 2021 at 11:06
This is the new error it's showing "Kotlin: [Internal Error] java.lang.NOClassDefFoundError: Could not initialize class com.intellij,pom.java.LanguageLevel" — Hyelngtil Isaac
– Hyelngtil Isaac, Commented Mar 26, 2021 at 12:12

Alexey Belkov · Accepted Answer · 2021-03-26 15:48:02Z

25

The problem is that the current version of the Kotlin compiler (1.4.31, 1.5-M1) doesn't work on JDK 16. Please use JDK < 16 for now. Related issue: https://youtrack.jetbrains.com/issue/KT-45566.

answered Mar 26, 2021 at 15:48

Alexey Belkov

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2 Comments

AlaaEddin Albarghoth Over a year ago

It didn't work for me I tried many versions !!

JonZarate Over a year ago

I think Kotlin 1.5.10 works with JDK 16 now, try updating Kotlin

duyvu1311 · Accepted Answer · 2021-04-03 01:44:16Z

6

Try File > Invalidate Caches/Restart...

answered Apr 3, 2021 at 1:44

duyvu1311

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1 Comment

Westside Tony Over a year ago

Even if you do the steps in described in the accepted answer, this was a necessary step. In my case as the issue persisted up to the point I did what was suggested here.

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