JVM compatibility error in buildSrc

[aSemy]

Hi, I've just updated to v6.1.1 and I'm getting an error

./gradlew version -q

FAILURE: Build failed with an exception.

* What went wrong:
java.lang.UnsupportedClassVersionError: me/qoomon/gradle/gitversioning/GitVersioningPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
> me/qoomon/gradle/gitversioning/GitVersioningPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

I see this changed in this commit: 4a7d963

I've set the plugin in my buildSrc/build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
  idea
  `kotlin-dsl`
  kotlin("jvm") version "1.6.21"
}


dependencies {
  // ...

  implementation("me.qoomon:gradle-git-versioning-plugin:6.1.1")
}


tasks.withType<KotlinCompile>().configureEach {

  kotlinOptions {
    jvmTarget = "11"
    apiVersion = "1.6"
    languageVersion = "1.6"
  }
}

kotlin {
  jvmToolchain {
    (this as JavaToolchainSpec).languageVersion.set(
        JavaLanguageVersion.of("11")
    )
  }

  kotlinDslPluginOptions {
    jvmTarget.set("11")
  }
}

I've set similar options for the subprojects that have the Kotlin JVM plugin.

I'm not quite sure what's wrong. I've tried a few options.

I think perhaps the best thing to do is for Git Versioning Plugin to set its JVM target to 1.8, so while the plugin requires and is written with 11, it produces class files that are compatible with 1.8.

sourceCompatibility = JavaVersion.VERSION_11
targetCompatibility = JavaVersion.VERSION_1_8

I'll keep investigating. I'm making this ticket in case there's something I've missed.

Update: it looks like this issue gradle/gradle#18935. Even though I specify 11 in buildSrc/build.gradle.kts it isn't acknowledged, because Gradle uses an embedded version of Kotlin that's bugged. It might be fixed in Gradle 7.5?

[qoomon]

Thanks for reporting.

[qoomon]

Version 6+ of gradle-git-versioning-plugin needs java 11 to work probably. You can check java version by java -version before you run gradle ...

[aSemy]

I'm using IntelliJ, and the SDK is set to JDK11

The same is true for Gradle

I think because the Gradle Git Versioning plugin has targetCompatibility = JavaVersion.VERSION_11 it's producing bytecode that is only compatible with Java 11+. I'm using buildSrc and the kotlin-dsl plugin, which has a maximum source compatibility of Java 8 - and I can't change that.

I think setting targetCompatibility = JavaVersion.VERSION_1_8 would fix it.

[qoomon]

I could try to change my target compatibility to 1.8

[qoomon]

please try version 6.1.2 I've changed target compatibility to 1.8

[aSemy]

Yes it's working now, thanks very much!