Solved it myself. I'll write it here for reference. I'll assume
you've successfully written a Datastored object in JDO and sent some other
object through RPC before.
First, make sure to follow the weakest links. In my case, RPC/GWT couldn't
handle the URL-class objects and JDO/GAE couldn't handle the Date-class
objects. So change them into some equivalent for storing. I used string and
long, respectively. Like so:
@Persistent public String linkUrl; @Persistent public long releaseDate;
Second, this relates to the first: make sure your (Primary) Key object is
serializable for RPC. I used a long instead of the Key-class. Like so:
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long key;
Third, if you want to keep it somewhere shared then you can use the /shared
package. Make sure to add it to your *.gwt.xml-file. When you do that the
implicitly defined <source path="client"/> will dissapear so you have to
explicitly define it yourself. Like so:
<source path='client'/>
<source path='shared'/>
Fourth, the JDO annotation @PersistanceCapable needs to set identityType to
Application and detachable to true. Not sure why the Application part is
needed, maybe someone can elaborate? I did it like this:
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable="true")
public class GameData
Fifth, ties with the fourth and is the obvious implementation of
IsSerializable for RPC. Like so:
public class GameData implements IsSerializable {
For your copy-paste convenience this is my whole file:
package net.seriema.calendar.game.shared;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
import javax.jdo.annotations.IdentityType;
import com.google.gwt.user.client.rpc.IsSerializable;
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable="true")
public class GameData implements IsSerializable {
@SuppressWarnings("unused")
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long key;
@Persistent public String title;
@Persistent public String linkUrl;
@Persistent public long releaseDate;
}
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