Please, first of all check this cases(most of all 3 and 4, may be you need to
use int instead of long):
A problem occurred accessing a property of an instance of a persistent class by
reflection, or via CGLIB. There are a number of possible underlying causes,
including
* failure of a security check
* an exception occurring inside the getter or setter method
* a nullable database column was mapped to a primitive-type property
* the Hibernate type was not castable to the property type (or vice-versa)
http://www.hibernate.org/hib_docs/v3/api/org/hibernate/PropertyAccessException.html
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