我有 RPC 服务，它返回一个 GameEvent 类型的对象，该对象从 Event（抽象）扩展。当我在客户端获取对象时，从 Event (eventId、copyEventId、gameTimeGMT) 继承的所有属性都设置为，null而在服务器端，这些属性具有值。
public class GameEvent extends Event implements IsSerializable {
private String homeTeam;
private String awayTeam;
public GameEvent() {
}
}
// Annotation are from the twig-persist framework which should not
// impact the serialization process.
public abstract class Event implements IsSerializable {
@Key
protected String eventId;
@Index
protected String copyEventId;
protected Date gameTimeGMT;
protected Event() {
}
}
更新：我使用 gwt-platform 框架（MVP 实现）。这是对服务客户端的调用。result.getGE()返回 GameEvent 对象，但带有属性null。
dispatcher.execute(
new GetFormattedEventAction(
id),
new AsyncCallback<GetFormattedEventResult>() {
@Override
public void onFailure(Throwable caught) {
caught.printStackTrace();
}
@Override
public void onSuccess(
GetFormattedEventResult result) {
FormattedGameEvent formattedGameEvent = new FormattedGameEvent(
result.getGE());
}
});
动作处理程序：
public class GetFormattedEventActionHandler implements
ActionHandler<GetFormattedEventAction, GetFormattedEventResult> {
@Override
public GetFormattedEventResult execute(GetFormattedEventAction action,
ExecutionContext context) throws ActionException {
GameEvent gameEvent = null;
QueryResultIterator<GameEvent> rs = datastore.find().type(
GameEvent.class).addFilter("copyEventId", FilterOperator.EQUAL,
action.getEventId()).returnResultsNow();
if (rs.hasNext()) {
gameEvent = rs.next();
}
return new GetFormattedEventResult(gameEvent);
}
}
结果：
public class GetFormattedEventResult implements Result {
private GameEvent e;
@SuppressWarnings("unused")
private GetFormattedEventResult() {
}
public GetFormattedEventResult(GameEvent gameEvent) {
e = gameEvent;
}
public GameEvent getGE() {
return e;
}
}