[英]error on spring data jpa with gae
我使用Google App Engine和Spring Data JPA。
@Entity
public class Feed {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key id;
private String name;
private String url;
private Date created;
public Feed() {
}
public Feed(String name, String url) {
this.name = name;
this.url = url;
this.created = new Date();
}
// Getter and Setter
}
@Entity
public class News {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key id;
@ManyToOne
private Feed feed;
private String title;
private Text content;
private String link;
private Date created;
public News(Feed feed, String title, String content, String link) {
this.feed = feed;
this.title = title;
this.content = new Text(content);
this.link = link;
this.created = new Date();
}
//Getter and Setter
}
错误消息是
尝试将键为“ Feed(6614661952700416)”的孩子分配给键为“ News(no-id-yet)”的父母。 父键是不可变的。 嵌套的异常是javax.persistence.PersistenceException:尝试将键为“ Feed(6614661952700416)”的项分配给键为“ News(no-id-yet)”的父项。 父键是不可变的
如何解决这个问题?
似乎您正在为新闻分配Feed,并尝试保留它,但是父级需求仍然没有保留。
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