just use java 1.8 with Android Studio 3.0+ and set following works for me:
it seems need the latest build tools
classpath 'com.android.tools.build:gradle:3.0.0'
and
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
...
//jackOptions { // DEPRECATED
//enabled true
//}
}
dexOptions {
incremental true
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}