build.gradle

import groovy.json.JsonSlurper

buildscript {

    ant.get(src: 'http://libgdx.badlogicgames.com/libgdx-site/service/getVersions?release=false', dest: 'versions.json')
    def versionFile = file('versions.json')
    def json
    if (versionFile.exists()) {
        json = new JsonSlurper().parseText(versionFile.text)
    } else throw new GradleException("Unable to retrieve latest versions, please check your internet connection")

    ext {
        gdxVersion = json.libgdxSnapshot
        gwtVersion = json.gwtVersion
        gwtGradleVersion = json.gwtPluginVersion
    }

    repositories {
        jcenter()
        mavenCentral()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
    }

    dependencies {
        classpath "de.richsource.gradle.plugins:gwt-gradle-plugin:$gwtGradleVersion"
    }
}

project(":preview") {
    apply plugin: "java"
    apply plugin: "gwt"
    apply plugin: "war"
    webAppDirName = 'webapp'

    repositories {
        jcenter()
        mavenCentral()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
    }

    dependencies {
        compile "com.badlogicgames.gdx:gdx:$gdxVersion"
        compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion"
        compile "com.badlogicgames.gdx:gdx:$gdxVersion:sources"
        compile "com.badlogicgames.gdx:gdx-backend-gwt:$gdxVersion:sources"
    }
}