Thanks for the response and confirmation.. and just an FYI.. i have fully explored the Apache Olingo OData framework.. it seems to be the only remaining actively developed Java based OData framework.. and it ONLY supports Version 2.0 and Version 4.0.
Version 3.0 support was completely abandoned mid-way and never got beyond an incomplete beta level for OData 3.0 support.
Also to save others time: Odata Version 3.0 and 4.0 spec is NOT compatible with version 2.0
and even 3.0 and 4.0 have breaking changes between them.