build.gradle

apply plugin: 'groovy'
apply plugin: 'java'

// set the dependencies for running the groovy script
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.codehaus.groovy:groovy-all:2.0.5'
        classpath 'org.apache.knox:gateway-shell:0.8.0'
    }
}

// set the dependencies for compiling the groovy script and mapreduce classes
repositories {
    mavenCentral()
}

dependencies {
    compile 'org.codehaus.groovy:groovy-all:2.0.5'
    compile 'org.apache.knox:gateway-shell:0.8.0'
    // compile MapReduce class
    compile(group: 'org.apache.hadoop', name: 'hadoop-common', version:'2.2.0') { }
    compile(group: 'org.apache.hadoop', name: 'hadoop-mapreduce-client-core', version:'2.2.0') { }
}

// tell gradle the groovy script is in the same folder as the build.gradle file
sourceSets {
    main {
        groovy {
            srcDirs = ['.']
        }
        // uncomment to enable http debugging
        // run './gradlew clean' after commenting/uncommenting
        resources {
        //   srcDirs = ['resources']
        }
    }
}

// MapReduce classes
jar {
    archiveName = 'hadoop-examples.jar'
    destinationDir = file('samples')
}

// task to run the groovy script
task('OozieMapReduce', dependsOn:'jar', type: JavaExec) {

    Properties props = new Properties()
    props.load(new FileInputStream("$projectDir/../../connection.properties"))

    environment 'gateway', props.gateway
    environment 'username', props.username
    environment 'password', props.password

    main = 'Example'
    classpath = sourceSets.main.runtimeClasspath
}

task('Example') {
    dependsOn OozieMapReduce
}