still not working... :(
following are my classes...
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Block implements Serializable {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long block_id;
@Persistent
private String block_description;
@Persistent(defaultFetchGroup = "true")
private BlockModule block_module;
....
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public abstract class BlockModule implements Serializable{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
protected Key key;
protected abstract String getTitle(HttpServletRequest req);
protected abstract String getContent(HttpServletRequest req);
}
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class MyBlock extends BlockModule{
@Persistent
private String block_title;
@Persistent
private String block_content;
...
i am putting *MyBlock*'s instance in *Block*'s instance ...
On Sat, Sep 26, 2009 at 2:05 AM, objectuser <[email protected]> wrote:
>
> Put the myContactInfo property in the default fetch group (search for
> defaultFetchGroup in this group).
>
> On Sep 25, 2:32 pm, Prashant <[email protected]> wrote:
> > Hi,
> >
> > I created a relationship similar to the one given
> > here<
> http://code.google.com/appengine/docs/java/datastore/dataclasses.html...>.
> > Suppose fetched an *Employee*** entity from datastore, now, how to get *
> > Employee*'s *ContactInfo* entity?
> >
> > I tries using *employee.myContactInfo* but it gives nullPointerException.
> >
> > Thanks.
> >
>
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