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Call of Java mutator method on immutable Kotlin collection

Reports Java mutator methods calls (like fill, reverse, shuffle, sort) on an immutable Kotlin collection.

This can lead to UnsupportedOperationException at runtime.


import java.util.Collections fun test() { val immutableList = listOf(1, 2) Collections.reverse(immutableList) }

To fix the problem make the list mutable.

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Kotlin, @snapshot@

Last modified: 13 July 2023