Gradle Groovy DSL — первая сборка — build.gradle — разбор по блокам

plugins {
    id 'java'
    id 'application'
}

group = 'com.example'
version = '1.0.0'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.apache.groovy:groovy:4.0.21'
    testImplementation 'org.junit.jupiter:junit-jupiter:5.10.2'
}

application {
    mainClass = 'com.example.App'
}

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
    }
}

tasks.named('test') {
    useJUnitPlatform()
}