使用属性访问器方法时的EclipseLink实体映射问题 [英] EclipseLink entity mapping problem when using property accessor methods

问题描述

鉴于下面的类，没有人知道为什么JPA的EclipseLink实现无法将它们映射到数据库实体吗?返回以下错误:

Given the class below does anyone know why EclipseLink implementation of JPA fails to map them to database entities? The following error is returned:

实体类[class com.my.entity.Y]没有指定主键.它应该定义@ Id，@ EmbeddedId或@IdClass.如果您使用这些注释中的任何一个定义了PK，请确保您在实体类层次结构中没有混合的访问类型(带有字段和属性的注释).

@Entity
@Access(AccessType.PROPERTY)
public interface Y {

    void setId(Long id);

    @Id
    Long getId();
}

@Entity
public class Z implements Y {

    long id;

    @Override
    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public Long getId() {
        return id;
    }
}

非常感谢

推荐答案

感谢与

Thanks to the person who linked to this question - it helped me come up with a solution to the issue as follows:

    @Entity
    public interface Y {

        void setId(Long id);

        @Id
        Long getId();
    }

   // introduce intermediate abstract class which implements Y

    @Entity
    public abstract class X implements Y {

    }

    // make Z extends X

    @Entity
    public class Z  extends X {

        // use targetEntity = X.class where required
        // leaving this class still free to use interface Y

        long id;

        @Override
        public void setId(Long id) {
            this.id = id;
        }

        @Override
        public Long getId() {
            return id;
        }
    }

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