Thanks for the quick response.
You are right, it it the Roo version compatibility. I got it working with Roo 1.1.4.
So right now I am unblocked and am able to have a single web application with Neo4J as the data-store.
Thought this might help others like me who took the latest Roo version (V 2.0) and found the same issue.
Will look forward to your update on the fix so that it works with Roo 2.0 as well.