objectify-appengine - 嵌入式类 - 不是受支持的属性类型

Question

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:

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

我的代码与Wiki中的代码相同.控制器中的部分:

    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:

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
}

班级一级:

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

Class LevelTwo:

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

所以这是我尝试的基本例子.关于什么缺失的任何想法？

Answer 1

你正在使用错误的@Embedded注释EntityWithEmbedded.

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