lucene/gradle/validation/check-environment.gradle

// This checks that we're running the desired version of Gradle and
// that the JVM is supported.

import org.gradle.util.GradleVersion

configure(rootProject) {
  ext {
    expectedGradleVersion = '6.0.1'
    minJavaVersion = JavaVersion.VERSION_11
  }

  wrapper {
    distributionType = Wrapper.DistributionType.ALL
    gradleVersion = expectedGradleVersion
  }

  def currentJavaVersion = JavaVersion.current()
  if (currentJavaVersion < minJavaVersion) {
    throw new GradleException("At least Java ${minJavaVersion} is required, you are running Java ${currentJavaVersion} "
      + "[${System.getProperty('java.vm.name')} ${System.getProperty('java.vm.version')}]")
  }

  // If we're regenerating the wrapper, skip the check.
  if (!gradle.startParameter.taskNames.contains("wrapper")) {
    def currentGradleVersion = GradleVersion.current()
    if (currentGradleVersion != GradleVersion.version(expectedGradleVersion)) {
      throw new GradleException("Gradle ${expectedGradleVersion} is required (hint: use the gradlew script): this gradle is ${currentGradleVersion}")
    }
  }
}