scala, jsr 223 & compiling

Question

I successfully set up small test app using scala via jsr 223 apis (scala 2.8.1 and sling JSR 223 implementation). However, when checked if ScriptEngine implements javax.script.Compilable, i got that is is not.

final ScriptEngine eng = new ScriptEngineManager().getEngineByName("scala");
System.out.println(eng instanceof Compilable);

Are there any other scala jsr 223 impl that supports script compiling? Thanks.