build.gradle

apply plugin: 'java'
apply plugin: 'eclipse'

repositories {
    mavenCentral()
}

dependencies {
    compile 'com.fasterxml.jackson.core:jackson-databind:2.3.3'
    compile 'com.netflix.rxjava:rxjava-string:0.18.3'

}

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'de.undercouch:gradle-download-task:1.0'
    }
}

apply plugin: 'download-task'
import de.undercouch.gradle.tasks.download.Download

task getSrcs

// see.
//    http://hg.openjdk.java.net/jdk6/jdk6/hotspot/tags
//    http://hg.openjdk.java.net/jdk7u/jdk7u/hotspot/tags
//    http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/tags

task downloadjava6(type: Download) {
	src "http://hg.openjdk.java.net/jdk6/jdk6/hotspot/archive/tip.zip"
	dest new File(buildDir, "jdk6tip.zip")
}
task downloadjava7(type: Download) {
	src "http://hg.openjdk.java.net/jdk7u/jdk7u/hotspot/archive/tip.zip"
	dest new File(buildDir, "jdk7tip.zip")
}
task downloadjava8(type: Download) {
	src "http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/archive/tip.zip"
	dest new File(buildDir, "jdk8tip.zip")
}

["java6", "java7", "java8"].each { ver ->
	def dep = tasks["download$ver"]
	task "extract$ver"(dependsOn: dep, type: Copy) {
		from zipTree(dep.dest)
		def n = dep.dest.name
		into new File("$projectDir/$ver",  n.substring(0, n.lastIndexOf('.')))
	}
	getSrcs.dependsOn "extract$ver"
}

task analyzeOptions(type: JavaExec) {
	main = "jvmoptions.OptionAnalyzer"
	classpath = sourceSets.main.runtimeClasspath
}
analyzeOptions.shouldRunAfter getSrcs

defaultTasks 'getSrcs', 'analyzeOptions'

sourceCompatibility = targetCompatibility = 1.8

eclipse {
	classpath {
		containers = [
			'org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8'
		]
	}
}