title: Travis CI Build failing on Android app Unsupported major.minor version 52
body: <p>I'm trying to build using Travis CI on my Android project with this .travis.yml file</p>
  
  <pre><code>language: android
  android:
    components:
      - platform-tools
      - tools
      - build-tools-23.0.3
      - android-23
      - sys-img-armeabi-v7a-android-23
      - sys-img-x86-android-23    
  </code></pre>
  
  <p>Here is my app level build.gradle:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.3"
      defaultConfig {
          applicationId "com.myname.myproject"
          minSdkVersion 19
          targetSdkVersion 23
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
      debug{
          testCoverageEnabled = true
      }
  }} 
  
  dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  compile 'com.android.support:appcompat-v7:23.4.0'
  compile 'com.android.support:design:23.4.0'
  
  testCompile "org.robolectric:robolectric:3.1.2"
  testCompile 'org.khronos:opengl-api:gl1.1-android-2.1_r1'
  testCompile 'junit:junit:4.12'
  testCompile 'org.mockito:mockito-core:1.10.19'
  
  androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
      exclude group: 'com.android.support', module: 'support-annotations'
  })
  </code></pre>
  
  <p>}</p>
  
  <p>I am getting this failure message on Travis CI:</p>
  
  <pre><code>FAILURE: Build failed with an exception.
  * Where:
  Build file '/home/travis/build/myname/myproject/app/build.gradle' line: 1 
  * What went wrong:
  A problem occurred evaluating project ':app'.
  &gt; java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --    debug option to get more log output.
  BUILD FAILED
  </code></pre>
  
  <p>From the error, it seems that it has something to do with the Java version. I notice that Travis uses Java version 1.7.0_76.</p>
  
  <p>I have tried some of the solutions at <a href="https://stackoverflow.com/questions/35990995/com-android-dx-command-main-unsupported-major-minor-version-52-0">Unsupported major.minor version 52.0 in my app</a>. None of them have worked for me. For instance, this doesn't seem to work:</p>
  
  <pre><code>android {
  ...
  compileOptions {
      sourceCompatibility JavaVersion.VERSION_1_7
      targetCompatibility JavaVersion.VERSION_1_7
  }
  </code></pre>
  
  <p>}</p>
  
  <p><strong>UPDATE</strong>: I fixed this by adding <code>jdk: oraclejdk8</code> to the second line of my <code>.travis.yml</code> file after <code>language:android</code></p>