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kotlinlang

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I'm using Gradle 8.12, and when I try to use `HexFormat` inside `buildSrc`, I get the following error.
Not sure how to actually fix it.

Something is setting `apiLevel = 1.8`, are you using `kotlin-dsl` maybe?

I would just use the regular `org.jetbrains.kotlin.jvm` plugin with sam-with-receiver plugin if you really need it

I think `kotlin-dsl` is what I use to declare plugins. For example, without it I cannot specify

```gradlePlugin {
  plugins {
    register("projectModule") {
      ...
    }

    register("projectDocs") {
      ...
    }
  }
}```


&gt; This is my usual suspect
suspect is confirmed
<https://github.com/gradle/gradle/blob/a3cacb207fec727859be9354c1937da2e59004c1/platforms/core-configuration/kotlin-dsl-plugins/src/main/kotlin/org/gradle/kotlin/dsl/plugins/dsl/KotlinDslCompilerPlugins.kt#L64|https://github.com/gradle/gradle/blob/a3cacb207fec727859be9354c1937da2e59004c1/pla[…]n/org/gradle/kotlin/dsl/plugins/dsl/KotlinDslCompilerPlugins.kt>

For declaring plugins, you just need `java-gradle-plugin`

Damn, why such a low version. But thanks for finding out!

`kotlin-dsl` is doing wayyyy too many things

No idea why they set a language version that is not the same as the embedded version

Maybe it's for compatibility reasons but it's not Gradle's decision to make

Especially in `buildSrc` you control the build classpath so :shrug:

After removing kotlin-dsl, I discovered its functions ended up EVERYWHERE in my Gradle files

If you want the syntaxic sugar for Kotlin (`tasks.findByType<Foo>(), val task by registering` , etc...), you can add `gradleKotlinDsl()` as a dependency

<https://cookbook.gradle.org/plugin-development/kotlin-plugins/#difference-with-buildgradlekts-scripts>

Thank you!

Btw, I found this
&gt; While it is supported to override the target language version when using the `kotlin-dsl` plugin to write build logic
Here <https://github.com/gradle/gradle/pull/33041>

However, it's not entirely clear what that means.

You can do some magic to override the `kotlin-dsl` defaults

<https://handstandsam.com/2022/04/13/using-the-kotlin-dsl-gradle-plugin-forces-kotlin-1-4-compatibility/>

This is a bit old now but I believe the concepts are similar

But really I would just use `org.jetbrains.kotlin.jvm`

I'm trying that route, but jvm + sam-with-receiver results in a gazillion errors

YESSS I DID IT!
I basically had to reproduce EXACTLY the kotlin-dsl setup, minus the Kotlin version obviously.

Lesson learnt, never blindly trust what is too easy to import and use, especially if for Gradle.

That was one of the fastest solved `buildSrc` issues :smile: