OpenJPA：找不到 AttributeOverride 的超类属性

Question

当尝试使用 AttributeOverride 注释映射继承的属性时，OpenJPA 会抛出错误，指出它无法在超类中找到该属性。我不确定如何以正确的方式映射它。

错误

嵌入属性“Order.mailingAddress”声明了“addressLine”的映射覆盖，但这不是嵌入类型中的持久属性。

代码

@Embeddable
public class Address{
    private String addressLine;
    private String city;
    private String state;
    private String zip;

    //getters and setters
}

@Embeddable
public class ExtendedAddress extends Address{
    private String additionalAddressLine;

    //getters and setters
}

@Entity
public class Order {
    @Id
    private id;

    @OneToOne
    private Customer customer;

    @Embedded
    @AttributeOverrides(value={
            @AttributeOverride(name="addressLine", 
                 column=@Column(name="mailingAddressLine")),
            @AttributeOverride(name="additionalAddressLine", 
                  column=@Column(name="mailingAddressLine2")),
            @AttributeOverride(name="city", 
                  column=@Column(name="mailingAddressCity")),
            @AttributeOverride(name="state", 
                  column=@Column(name="mailingAddressState")),
            @AttributeOverride(name="zip", 
                  column=@Column(name="mailingAddressZip")),
    })
    private ExtendedAddress mailingAddress;

    @Embedded
    @AttributeOverrides(value={
            @AttributeOverride(name="addressLine", 
                 column=@Column(name="billingAddressLine")),
            @AttributeOverride(name="city", 
                  column=@Column(name="billingAddressCity")),
            @AttributeOverride(name="state", 
                  column=@Column(name="billingAddressState")),
            @AttributeOverride(name="zip", 
                  column=@Column(name="billingAddressZip")),
    })
    private Address billingAddress;

    //getters and setters
    //hashcode
    //equals
}

SQL

CREATE TABLE Orders (
  id INT PRIMARY KEY GENERATED ALWAYS,
  mailingAddressLine VARCHAR(45) DEFAULT NULL,
  mailingAddressLine2 VARCHAR(45) DEFAULT NULL,
  mailingAddressCity VARCHAR(45) DEFAULT NULL,
  mailingAddressState CHAR(2) DEFAULT NULL,
  mailingAddressZip CHAR(9) DEFAULT NULL,
  billingAddressLine VARCHAR(45) DEFAULT NULL,
  billingAddressCity VARCHAR(45) DEFAULT NULL,
  billingAddressState CHAR(2) DEFAULT NULL,
  billingAddressZip CHAR(9) DEFAULT NULL
)

Answer 1

将 Embeddables 中的访问级别（地址和扩展地址）从私有更改为受保护或默认。