build.gradle

plugins {
    id 'java'
    id 'idea'
    id 'maven-publish'
}

base {
    archivesName = id
    libsDirectory = new File("buildjars/");
}

java {
    withSourcesJar()
    sourceCompatibility = targetCompatibility = JavaVersion.VERSION_1_8
}

println("Gradle Java: ${JavaVersion.current()}")
println("Java: ${System.getProperty 'java.version'}, JVM: ${System.getProperty 'java.vm.version'} (${System.getProperty 'java.vendor'}), Arch: ${System.getProperty 'os.arch'}, Encoding: ${System.getProperty "file.encoding"}")

repositories {
    google()
    mavenCentral()
}

dependencies {
    compileOnly "org.apache.logging.log4j:log4j-api:$log4j_version"
    compileOnly "org.apache.logging.log4j:log4j-core:$log4jcore_version"
    compileOnly "org.apache.commons:commons-lang3:$commonslang3_version"
}

jar {
    duplicatesStrategy = DuplicatesStrategy.WARN

    manifest {
        attributes "Specification-Title"     : id
        attributes "Specification-Vendor"    : authors
        attributes "Specification-Version"   : version
        attributes "Implementation-Title"    : brandname
        attributes "Implementation-Version"  : version
        attributes "Implementation-Vendor"   : authors
        attributes "Implementation-Timestamp": new Date().format("yyyy-MM-dd'T'HH:mm:ssZ")
    }
}

publishing {
    tasks.publish {
        dependsOn(tasks.build)
    }
    publications {
        register('mavenJava', MavenPublication) {
            artifact jar
        }
    }
    repositories {
        maven {
            url "file://${project.projectDir}/publications"
        }
    }
}