Hi Aashu,
It looks that your application is having hibernate hence add the
hibernate-x.x.x.jar where
x is the version of hibernate in your server classpath and check if that solves your issue.
Also if you are using shared library then checking out the below link would be surely helpfull.
Topic: Classloading: Making Hibernate work on WebLogic
http://middlewaremagic.com/weblogic/?p=5861