Error with multi-dimensional array FFI

[rahulmutt]

{-# LANGUAGE MultiParamTypeClasses #-}

import Java
import Control.Monad

data JIntIntArray = JIntIntArray @int[][]
  deriving Class

instance JArray JIntArray JIntIntArray

foreign import java unsafe "@static eta.test.Utils.getIntIntArray" getIntIntArray
  :: Java a JIntIntArray

main :: IO ()
main = do
  ints <- java $ do
    iiarr <- getIntIntArray
    iarrs <- iiarr <.> arrayToList 
    forM iarrs $ \iarr -> iarr <.> arrayToList
  print ints

The code above crashed with:

Exception in thread "main" java.lang.ClassFormatError: Invalid method signature in method main.Main.DJIntIntArray(Leta/runtime/stg/StgContext;[Lint[];)Leta/runtime/stg/Closure;
	at eta.main.main(Unknown Source)