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Hibernate Table per concrete class is throwing org.hibernate.NonUniqueObjectException:

 
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I have an abstract class and two concrete class which extend these abstract class. I have mapped all the three in a employee.hbm.xml file. It is throwing the following error. My db is mysql

Exception in thread "main" org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [temp.ContractEmployee#0]

.
Could someone kindly look into it.

Abstract Class


Extended Class 1

Extended Class 2


MainClass

employee.hbm.xml file



 
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Eclipse IDE Spring Java
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your primary key is "assigned"?
Where are you setting your primary key?
 
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