I am writing a simple plugin for the Simula language. The compiler produces an executable .jar and I want to execute it using JDK 25. I tried to run my plugin, I got: error: simula/plugin/extensions/lang/SimulaFileType has been compiled by a more recent version of the Java Runtime (class file ver…

See reply here [image] Incompatible Gradle and Kotlin comes with IntelliJ IDEA 2025.3.1 IntelliJ Platform Hi, JetBrains IDEs 2025.3 still use JBR 21 runtime and you will not be able to use JDK 25 classes and bytecode target for plugins until we switch to 25. …

Kotlin: Unknown JVM target version: 25

IntelliJ Platform

yuriy.artamonov (Yuriy Artamonov) December 28, 2025, 2:45pm 2

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Kotlin: Unknown JVM target version: 25

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