# Incompatible Gradle and Kotlin comes with IntelliJ IDEA 2025.3.1

**URL:** <https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411>\
**Category:** IntelliJ Platform\
**Created:** [December 28, 2025, 8:43am UTC](https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411 "2025-12-28T08:43:23Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![o.myhre](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/o.myhre/32/2240_2.png) [@o.myhre](https://platform.jetbrains.com/u/o.myhre)\
**Post date:** [December 28, 2025, 8:43am UTC](https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411/1 "2025-12-28T08:43:23Z")

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**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 compatible with Gradle 9.0.0. Please fix JAVA\_HOME environment variable.

**After quite a while I got: A seemingly ok project.**

I then pressed: [Run IDE with Plugin]  
I got a lot of errors:

- Project JDK is not defined
- Kotlin: Unknown JVM target version: 25  
Supported versions: 1.8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
- Incompatible Gradle JVM
- The autoGenerated: MyMessageBundle is full of errors:
  - e: file:///C:/GitHub/WorkSpaces/Intellij/SimpleSimulaPlugin/src/main/kotlin/org/simula/simplesimulaplugin/MyMessageBundle.kt:14:22 This annotation is not applicable to target ‘type usage’. Applicable targets: field, local variable, value parameter, expression

**I use:**  
IntelliJ IDEA 2025.3.1  
Build #IU-253.29346.138, built on December 18, 2025  
Source revision: 9478cb03fae44  
Runtime version: 21.0.9+1-b1163.86 amd64 (JCEF 137.0.17)  
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.  
Toolkit: sun.awt.windows.WToolkit  
Windows 11.0  
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation  
Memory: 2048M  
Cores: 16  
Registry:  
ide.experimental.ui=true  
Non-Bundled Plugins:  
org.jetbrains.completion.full.line (253.29346.138)  
intellij.webp (253.28294.218)  
Subversion (253.29346.170)  
DevKit (253.29346.50)  
com.intellij.spring (253.29346.157)  
com.jetbrains.restClient (253.29346.170)  
intellij.jupyter (253.29346.138)  
org.jetbrains.plugins.kotlin.jupyter (253.29346.138)  
org.jetbrains.idea.maven (253.29346.138)  
com.intellij.mcpServer (253.29346.142)  
Kotlin: 253.29346.138-IJ

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<div class="post-metadata">

**Author:** ![yuriy.artamonov](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/yuriy.artamonov/32/48_2.png) [@yuriy.artamonov](https://platform.jetbrains.com/u/yuriy.artamonov)\
**Post date:** [December 28, 2025, 9:40am UTC](https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411/2 "2025-12-28T09:40:23Z")

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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

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<div class="post-metadata">

**Author:** ![o.myhre](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/o.myhre/32/2240_2.png) [@o.myhre](https://platform.jetbrains.com/u/o.myhre)\
**Post date:** [December 28, 2025, 9:43am UTC](https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411/3 "2025-12-28T09:43:20Z")

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```auto
Any idea when that will be?

```

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<div class="post-metadata">

**Author:** ![yuriy.artamonov](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/yuriy.artamonov/32/48_2.png) [@yuriy.artamonov](https://platform.jetbrains.com/u/yuriy.artamonov)\
**Post date:** [December 28, 2025, 9:44am UTC](https://platform.jetbrains.com/t/incompatible-gradle-and-kotlin-comes-with-intellij-idea-2025-3-1/3411/4 "2025-12-28T09:44:37Z")

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EAP 2026.1 starts approximately in the middle of January 2026