Hibernate: @Convert maps a type the database does not have

@Converter(autoApply = true)
class MoneyConverter implements AttributeConverter<Money, BigDecimal> {
    public BigDecimal convertToDatabaseColumn(Money m) { return m == null ? null : m.amount(); }
    public Money convertToEntityAttribute(BigDecimal d) { return d == null ? null : new Money(d); }
}

@Entity
class Order {
    Money total;      // stored as decimal(19,2)
}

autoApply = true applies it to every Money field in the model,
so no entity needs to mention the converter at all.