java - Play 框架从 2.1 更新到 2.2 : SimpleResult not working - compile error

Question

我们正在将项目从 Play Framework 2.1 升级到 2.2。然而，新的结果结构并没有发挥作用。我已在此 Global.java 文件中的“call”函数中将返回类型 Result 更改为 SimpleResult:

public class Global extends GlobalSettings {

@Override
  public void onStart(Application app) {
    Logger.info("Global On Start event called");
    Logger.info("Admin Application has started");
    // get schedule duration from Application.conf
    Long scheduleDuration = Play.application().configuration().getLong("schedule-duration");
    Logger.debug("Scheduler duration is :"+ scheduleDuration) ;
    Logger.debug("Calling Schedule Service");
    Cancellable response1 = ScheduleService.scheduleIt(scheduleDuration);

    // get schedule duration for Worker Task Expiration Scheduler from application.conf
    Long workerTaskExpirationDuration = Play.application().configuration().getLong("worker-task-scheduler-interval");
    Cancellable response2 = TaskExpirationScheduleService.schedule(workerTaskExpirationDuration);
    /******************fix for CEA-3440*************************************/
    Long workerEmailDuration = Play.application().configuration().getLong("worker-email-scheduler-interval");
    Cancellable response3 = WorkerEmailScheduleService.schedule(workerEmailDuration);
     /******************fix for CEA-3440*************************************/
  }  

  @Override
  public void onStop(Application app) {
    Logger.info("Global On Stop event called");
    Logger.info("Application shutdown started..Stopping Sync Service Actor.");
    ActorRef syncActor = Akka.system().actorFor("/user/SyncServiceActor");
    Akka.system().stop(syncActor);
    Logger.info("Application shutdown started..Stopping Worker Task Expiration Actor.");
    ActorRef taskExpirationActor = Akka.system().actorFor("/user/WorkerTaskExpireActor");
    Akka.system().stop(taskExpirationActor);
     /******************fix for CEA-3440*************************************/
    Logger.info("Application shutdown started..Stopping Worker Email Actor.");
    ActorRef workerTaskExpirationDuration = Akka.system().actorFor("/user/WorkerTaskExpirationDuration");
    Akka.system().stop(workerTaskExpirationDuration);
     /******************fix for CEA-3440*************************************/
    // shut down system
    Akka.system().shutdown();
    Logger.info("Actor stopped and Akka System shutdown successfully..");
  }  




// For CORS
  private class ActionWrapper extends Action.Simple {
  public ActionWrapper(Action<?> action) {
  this.delegate = action;
  }

  @Override
  public Promise<SimpleResult> call(Http.Context ctx) throws java.lang.Throwable {
       Http.Response response = ctx.response();
       response.setHeader("Access-Control-Allow-Origin", "*");
       response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE"); 
       response.setHeader("Allow", "*"); 
       response.setHeader("Access-Control-Max-Age", "3600"); 
       response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Referer, User-Agent"); 
       response.setHeader("Access-Control-Allow-Credentials", "true"); 
       Promise<SimpleResult> result = (Promise<SimpleResult>) this.delegate.call(ctx);
       return result;
  }
  }

  @Override
  public Action<?> onRequest(Http.Request request, java.lang.reflect.Method actionMethod) {

  return new ActionWrapper(super.onRequest(request, actionMethod));
  }

}

在浏览器上编译时会出现以下错误:

我尝试通过查看类似的 StackOverflow 问题来解决此问题，但无法解决该问题。我对 Play 比较陌生，因此请详细说明您的解决方案。

此外，我使用 Eclipse 作为 IDE，但出现以下错误:

The return type is incompatible with Action.call(Http.Context)

谢谢。

Answer 1

只需将 SimpleResult 替换为 Result 即可？

这是一个操作示例

public F.Promise<Result> call( Http.Context context ) throws Throwable {

    if ( !authorized ) {
        return F.Promise.promise(() -> unauthorized());
    }

    // execute the action
    return delegate.call( context );
}

这是我的 Global.java

@Override
public F.Promise<Result> onError(Http.RequestHeader requestHeader, Throwable throwable) {
    if(Play.isDev()){
        return super.onError(requestHeader, throwable);
    }
    Logger.error("Error : ", throwable);
    return F.Promise.pure(Controller.ok(views.html.error.render(requestHeader.uri())));
}

您应该阅读https://www.playframework.com/documentation/2.2.0/Migration22#New-results-structure-in-Java