我有3个类别的关系：
会员1-n追踪器
链接1-n跟踪器
具有一对多的双向关系
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Member {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent(mappedBy = "member")
private List<Tracker> trackers;
}
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Link {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent(mappedBy = "link")
private List<Tracker> trackers;
}
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Tracker {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Member member;
@Persistent
private Link link;
}
我创建一个新的跟踪器：
member = new Member();
member.name = "blah";
link = new Link();
link.url = "http://blahblah.blah";
tracker = new Tracker();
tracker.setMember(member);
tracker.setLink(link);
pm.makePersistent(tracker);//error
它抛出
The class "The class "zodpob.model.Tracker" is not persistable. This
means that it either hasnt been enhanced, or that the enhanced version
of the file is not in the CLASSPATH (or is hidden by an unenhanced
version), or the Meta-Data/annotations for the class are not found."
is not persistable. This means that it either hasnt been enhanced, or
that the enhanced version of the file is not in the CLASSPATH (or is
hidden by an unenhanced version), or the Meta-Data for the class is
not found.
“增强”是什么意思？
如果我坚持一个没有关系的课程，那就很好
最佳答案
确保您使用的是DataNucleus插件。
这是他们的网站...
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...这里是如何将其安装到Eclipse IDE ...
link text
...这是与JDO一起使用的案例。
link text
希望对您有所帮助，并祝您好运。