How to force SBT to use Java 8?

Question

How can I force SBT to compile to Java 8 class files. I added scalacOptions += \"-target:jvm-1.8\" but it gives the following error message:

[error] \'jvm-1         


        

Answer 1

Support in scalac for jvm-1.8 was added in 2.11.4.

Scala version (2.11.2) does not support -target:jvm-1.8 option.

$ scala -version
Scala code runner version 2.11.2 -- Copyright 2002-2013, LAMP/EPFL

$ scala -target
Usage: -target:
 where  choices are jvm-1.5, jvm-1.6, jvm-1.7 (default: jvm-1.6)

bad option: '-target'

Usage: scala  [ ]
   or  scala -help

All options to scalac (see scalac -help) are also allowed.