How to use MWBuiltInArray which was return as Object by JavaBuilder in a API call

Hi,

   I have some legacy functions in Matlab which I can not modify. I can only use JavaBuilter wrapper functions from java to use those. It returns as Object[]

Object[] result = wrapperObj.callSomeFunction(1,param1, param2, param3);

If matlab function is returning a vector then I can fetch the values. If it is returning struct then I can typecast it to MWStructArray but it is somethingelse (I guess matlab object) then I am not able to use matlab object. Casting it to MWStructArray gives below exception

com.mathworks.toolbox.javabuilder.MWBuiltinArray cannot be cast to com.mathworks.toolbox.javabuilder.MWStructArray

In which java class I should cast it ?

Thanks, Rahul