[appengine-java] One - Many Child Persistence help

[DeliveryNinja]

I've been trying to tweak this to get it working for a while now and
I've had no luck at all.

First off I create two classes

@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
public class ServerContent implements Serializable {


        private static final long serialVersionUID = 7230645578648036546L;

        @PrimaryKey
        @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key id;

        @Persistent
        private int rating = 0;

        @Persistent
        private Text widgetContent;

        @Persistent
        private String user;

        @Persistent
        private Date date;

        @Persistent
        private String title;

        @Persistent(mappedBy = "parentKey")
        @Element(dependent = "true")
        private List<ServerComment> comments = new
ArrayList<ServerComment>();


And the second class


@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
public class ServerComment implements Serializable {

        private static final long serialVersionUID = 7577060064503658111L;

        @PrimaryKey
        @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key id;

        @Persistent
        private ServerContent parentKey;

        @Persistent
        private Text content;

        @Persistent
        private Date date;

        @Persistent
        private String user;

        @Persistent
        private boolean approved;

        @Persistent
        private int rating;


I have a method which will create a comment on some content. The Web
page updates correctly but the call to save ServerContent never works.
I get a silent failure in by AsyncCallback and it throws a
com.google.gwt.user.client.rpc.SerializationException with the details
null and stacktrace null.

I have saved the parent class with an empty set of ServerComment
When I add new ServerComments to by ServerContent class and then try
and save the parent, the error is thrown. I've been trying to get
around this for over a day now! any help is much appreciated thanks!

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