Reg. Scripted Data Source ClassPath

Hi,
In which directory should I put my classes for scripted data source. I have tried
classes directory as given in the tutorials but no luck. I am using 2.3.2.

Error that I keep getting are :
There are errors evaluating script "__bm_open()" TypeError[JavaPackage Test.SimpleClass] is not a
function , it is ...  NativeJavaPackage.

Thanks ,
Shivam