I am working on a web based application in which i have been using Spring with
Hibernate. While updating one of my tables, i take such a CGLib error.
Do you recognize such an error message?
Note: I have a foreign key in this table and i provide a reference to parent
class for this foreign key in my pojo.

javax.servlet.ServletException: exception setting property value with CGLIB (set
hibernate.cglib.use_reflection_optimizer=false for more info) getter of
gui.model.hibernate.AarPrefixTable.?; nested exception is
net.sf.hibernate.PropertyAccessException: exception setting property value with
CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) getter
of gui.model.hibernate.AarPrefixTable.?

You probably have primitive type of property, but in the database it has value NULL. So what should the value be then?
Change property to object wrapper.