I have an answer to this question ... the return value must be sent to MWCellArray, and later the getCell function must be used to get the cell value that will be the MWArray object.
MWArray - .
::
Object[] o = <matlab function called>
MWCellArray x = (MWCellArray)o[0];
MWArray arr = x.getCell(new int[]{1,1});
arr String. , arr.toString() ..:)