带有Gae的Spring Data JPA错误 [英] error on spring data jpa with gae

问题描述

我使用Google App Engine和Spring Data JPA.

I use Google App Engine and 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

尝试将具有键"Feed(6614661952700416)"的子项分配给父项 键为新闻(no-id-yet)".父键是不可变的.嵌套的 异常是javax.persistence.PersistenceException:尝试分配 密钥为"Feed(6614661952700416)"的孩子带密钥的父级 新闻(还没有)".父键是不可变的

Attempt to assign child with key "Feed(6614661952700416)" to parent with key "News(no-id-yet)". Parent keys are immutable; nested exception is javax.persistence.PersistenceException: Attempt to assign child with key "Feed(6614661952700416)" to parent with key "News(no-id-yet)". Parent keys are immutable

如何解决此问题?

推荐答案

似乎您是在为新闻分配提要，并试图保留它，但是仍然没有保留父级的需要.

Seems you are assigning a feed to a news and trying to persist it but the parent need still haven't been persisted.

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