from javax.ejb
EJBException
trhown by an EJB when application-specific method cannot be completed
NoSuchEntityException
entity bean does not exist.
CreateException
EJB can not be created
DuplicateKeyException
Entity EJB can not be created as object with same keya lready exists
RemoveException
EJB can not be removed
FinderException
Collection of one or more entity EJBs can not be found
ObjectNotFoundException
a Single EJB object can not be found.