java-custom-runtime/build.gradle at master · mike-neck/java-custom-runtime · GitHub

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plugins {
    id 'java'
}

ext {
    modDir = file("$buildDir/mod")
    java11 = System.getenv('JAVA_HOME')
}

repositories {
    jcenter()
}

dependencies {
    testImplementation 'junit:junit:4.12'
}

jar {
    //noinspection GroovyAssignabilityCheck
    manifest {
        attributes('Main-Class': 'com.example.App')
    }
}

task prepareModDir {
    doLast {
        if (!modDir.exists()) {
            modDir.mkdirs()
        }
    }
}

task showJavaVersion(type: Exec) {
    commandLine "$java11/bin/java", '-version'
}

task modJar(type: Exec, dependsOn: [compileJava, 'prepareModDir']) {
    commandLine "$java11/bin/jar", '-c', '-f', "$modDir/${project.name}.jar", '--main-class', 'com.example.App', '-C', compileJava.destinationDir, '.'
}