build.gradle

buildscript {
    repositories { jcenter() }
    dependencies { classpath 'com.github.jengelman.gradle.plugins:shadow:0.8' }
}

allprojects {
    version = '1.0'
}

subprojects {
    apply plugin: 'java'
    apply plugin: 'shadow'

    sourceCompatibility = 1.7

    repositories { mavenCentral() }

    shadow {
        artifactAttached = false
    }
}

Core_build.gradle

dependencies {
    compile 'com.google.guava:guava:15.0'
}

shadow {
    artifactSet {
        include 'com.google.guava:guava'
    }

    relocation {
        pattern = 'com.google.common'
        shadedPattern = 'com.example.util.com.google.common'
    }
}

ProjectPackage_build.gradle

dependencies {
    compile project(':Core')
}