Retrolambda build fail

build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'me.tatarka:gradle-retrolambda:2.1.0'
    }
}

apply plugin: 'com.android.application'
apply plugin: 'retrolambda'

android {
    compileSdkVersion 19
    buildToolsVersion "20.0.0"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "com.cypressworks.retrolambdafailure"
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile 'com.google.android.gms:play-services:+'
    compile 'com.android.support:support-v4:19.1.0'
}

MarkerMapFragment.java

package com.cypressworks.retrolambdafailure;

import com.google.android.gms.maps.SupportMapFragment;

public class MarkerMapFragment extends SupportMapFragment {
    Runnable r = () -> {
    };
}