I am new to hibernate and was trying out few things and was wondering how locks can be implemented using hibernate...
Say if i have two threads trying to update the data (same row in database) using different sessions...and if one of the thread updates the data in that row after other threads gets the data...how do i make sure other thread knows about the changes?

-Kanth

Read this entire chapter:

http://www.hibernate.org/hib_docs/refer ... tions.html

If it doesn't sink in, read it again :) You can't explain this topic in a short forum response.