I created a new plugin project: With: JDK: 25 Oracle OpenJDK 25 and: Add sample code And dependencies: XML Java Kotlin I then pressed [Create] I got: Gradle ‘SimpleSimulaPlugin’ build scripts found, I pressed [Load Gradle Project] I got: Found invalide Gradle JVM configuration JDK 25 isn’t …

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. The plan is to update runtime to 25 in 2026.1 versions starting with EAP

Incompatible Gradle and Kotlin comes with IntelliJ IDEA 2025.3.1

IntelliJ Platform

yuriy.artamonov (Yuriy Artamonov) December 28, 2025, 9:44am 4

EAP 2026.1 starts approximately in the middle of January 2026

Topic		Replies	Views
Kotlin: Unknown JVM target version: 25 IntelliJ Platform plugin-development	1	434	December 28, 2025
Kotlin plugin compiled with later Kotlin version in 261.21525.39-EAP-SNAPSHOT IntelliJ Platform plugin-development	3	53	February 23, 2026
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Incompatible Gradle and Kotlin comes with IntelliJ IDEA 2025.3.1

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