shadowJar task with minimize() doesn't use gradle toolchain.

[VasilisManol]

Expected and Results

call shadowJar task with minimize() without errors.

Related environent and versions

Gradle 8.6
shadow 8.3.5

Installed JDKs
openjdk 8 - default
openjdk 21

Reproduction steps

• Use jdk 8 as default
• Install jdk 21
• Create a gradle project with build.gradle.kts:

plugins {
    id("java")
    id("com.gradleup.shadow") version ("8.3.5")
}

java {
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(21))
    }
}

configure<JavaPluginExtension> {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_21
}

repositories {
    mavenCentral()
    mavenLocal()
}

dependencies {
....
}

tasks.named<com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar>("shadowJar") {
    exclude("META-INF", "META-INF/**")
    minimize()
    archiveClassifier.set("")
    isZip64 = true
}

tasks {
    build {
        dependsOn(shadowJar)
    }
}

• Build e.g. ./gradlew build
  Then the following error occurs:

  Execution failed for task ':shadowJar'.
> org/vafer/jdependency/Clazzpath 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

If minimize() is commented out it builds as expected.

Anything else?

This error looks related with #814 but maybe not exactly the same. When switching to jdk21 as default jdk, minimize() doesn't give any error.