Hibernate: Nullable columns and primitive fields do not mix

A null in the database cannot be assigned to an int, and the failure happens at load time.

Code

@Entity
class Order {
    int quantity;        // column is nullable -> exception on load
    Integer discount;    // correct for a nullable column
}

Output

org.hibernate.PropertyAccessException:
Could not set field value [null] value by reflection : [Order.quantity]

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Published 2026-08-11