Hi Sireesha,
i guess this cud be a prob,
Comment the following tag in *.cfg.xml(hibernate.cfg.xml)
<!-- Drop and re-create the database schema on startup
<property name="hbm2ddl.auto">create</property>
-->
while u execute ur program , Create means each and every time all the tables are dropped and re create again...so just comment while u execute ur application second time onwards.
Thanks
Saravanan
Mindtree-Chennai
sarava20@gmail.com