java.lang.ClassCastException: This exception has no message.

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java.lang.ClassCastException:
at net.sf.hibernate.type.ByteType.set(ByteType.java:30)
at net.sf.hibernate.type.NullableType.nullSafeSet(NullableType.java:48)
at net.sf.hibernate.type.NullableType.nullSafeSet(NullableType.java:35)
at net.sf.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:47)
at net.sf.hibernate.persister.EntityPersister.dehydrate(EntityPersister.java:393)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:507)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:432)

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