I could be wrong. But I think the kotlin compiler ...

# gradle

[jlleitschuh]

I could be wrong. But I think the kotlin compiler always produces JDK 6 bytecode.

Run ./gradlew -version that will tell you what version of Java gradle is running.

I think the only case where the kotlin compiler wont produce JDK 6 bytecode is when you enable the compiler flag to support generating JDK 8 compliant default methods on interfaces.
@h0tk3y Am I correct or totally wrong?