objectify-appengine - 嵌入式类 - 不是受支持的属性类型 [英] objectify-appengine - Embedded class - not a supported property type

问题描述

我正在谷歌应用引擎上尝试objectify（版本2.2.3）嵌入式类示例（wiki）。我收到此错误：

I am trying out the objectify(version 2.2.3) embedded classes example (wiki) on google app engine. I am getting this error:

java.lang.IllegalArgumentException: one: com.mypkg.LevelOne is not a supported property type.
    at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedSingleValue(DataTypeUtils.java:184)

代码I与Wiki中的相同。控制器中的部分：

The code I have is the same as the one in Wiki. The section in the controller:

    EntityWithEmbedded ent = new EntityWithEmbedded();
    ent.one = new LevelOne();
    ent.one.foo = "Foo Value";
    ent.one.two = new LevelTwo();
    ent.one.two.bar = "Bar Value";

EntityWithEmbedded类：

The EntityWithEmbedded class:

import javax.jdo.annotations.Embedded;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class EntityWithEmbedded {
    @Id public Long id;
    @Embedded public LevelOne one;
    //getter & setters here
}

Class levelOne：

Class levelOne:

import javax.persistence.Embedded;
public class LevelOne {
    public String foo;
    public @Embedded LevelTwo two;
    //getter & setters here
}

Class LevelTwo：

Class LevelTwo:

public class LevelTwo {
    public String bar;
        //getter & setters here
}

所以这是我尝试的基本示例。关于什么缺失的任何想法？

So it is the basic example that I am trying out. Any ideas on what is missing?

推荐答案

你使用了错误的 @Embedded c注释 EntityWithEmbedded 。

You're using the wrong @Embedded annotation in EntityWithEmbedded.

使用 javax.persistence.Embedded 而不是 javax.jdo.annotations.Embedded

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