this is one to many
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Province {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private String name;
@Persistent(mappedBy = "province")
private List<Town> towns;
**** Town.java ****
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Town {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Province province;
}
On Aug 6, 5:45 am, Premier <[email protected]> wrote:
> Hello,
> i'm tring Java on GAE and usingJDOto map my beans. I attended
> athttp://code.google.com/appengine/docs/java/datastore/relationships.ht...
> to set beans relationships, but, always occurs follow error
>
> Error in meta-data for com.bean.Town.id: Cannot have a java.lang.Long
> primary key and be a child object (owning field is
> com.bean.Province.town).
>
> My beans are
>
> **** Province.java ****
> @PersistenceCapable(identityType = IdentityType.APPLICATION)
> public class Province {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Long id;
>
> @Persistent
> private String name;
>
> @Persistent(mappedBy = "province")
> private Town town;
>
> **** Town.java ****
> @PersistenceCapable(identityType = IdentityType.APPLICATION)
> public class Town {
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Long id;
>
> @Persistent
> private Province province;
>
> Example in link uses class like mine.
>
> How i can solve?
> how i can map relationships?
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