无法在Java Playframework中创建调度程序？

Question

我是Playframework的新手。我正在尝试创建一个调度程序。我在创建它时遇到了问题。在这里，我分享了我的一部分代码。请帮我解决这个问题。我正在得到nullpointerexception。

Service.Java

public class AdminServices extends Service {
public ActorSystem actorSystem;
public ExecutionContext executionContext;

public class adminTaskScheduler {

}

public static AdminServices instance;
// private ActorSystem actorSystem;
// private ExecutionContext executionContext;

AdminServices() {
}

public static AdminServices getInstance() {
    if (instance == null) {
        instance = new AdminServices();
    }
    return instance;
}

// @Inject
// public AdminServices(ActorSystem actorSystem, ExecutionContext
// executionContext) {
// this.actorSystem = actorSystem;
// this.executionContext = executionContext;
//
// this.initialize();
// }
//
// private void initialize() {
// this.actorSystem.scheduler().schedule(Duration.create(10,
// TimeUnit.SECONDS),
// Duration.create(1, TimeUnit.DAYS), // delay
// () -> this.adminTaskScheduler(null, null), this.executionContext);
//
// }

public ServiceResult adminTaskScheduler( Integer userId) {
    System.out.println("This is imp");
    List<CourseCompletedDetailsDTO> pendingCourseDetailsList = new ArrayList<>();
    //List<AppUserModel> appUserModelList = new ArrayList<>();
    CourseCompletedDetailsDTO courseCompletedDetailsDTO = new CourseCompletedDetailsDTO();
    // List<CourseCompletedDetailsDTO> courseCompletedDetailsList = new
    // ArrayList<>();
//  for (AppUserModel appUserModel : appUserModelList)
    //  userId = appUserModel.getId();
    try {
        AppUserModel employeeModel = AppUserServicesDAO.getInstance().getUserForUserId(userId);
        System.out.println("user Id" + employeeModel);
        if (employeeModel != null) {
            // EmployeeProfileReturnValue profile = new
            // EmployeeProfileReturnValue();
            CourseModel courseModel = new CourseModel();
            EmployeeProfileReturnValue.EmployeeProfileDTO pDTO = new EmployeeProfileReturnValue.EmployeeProfileDTO();
            pDTO.setPendingCourses(pendingCourseDetailsList);

            pDTO.setName(employeeModel.getUserName());
            courseCompletedDetailsDTO.setCourseCode(courseModel.getCourseCode());
            courseCompletedDetailsDTO.setCourseId(courseModel.getId());
            courseCompletedDetailsDTO.setCourseName(courseModel.getCourseName());
            pDTO.setDesignation(employeeModel.getDesignation());
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    //return appUserModelList;
    return createServiceResult(SERVICE_SUCCESS);
    //return null;

}

@Inject
public AdminServices(ActorSystem actorSystem, ExecutionContext executionContext, Integer Id) {
    // String sessionToken ;
    // Integer userId;
    this.actorSystem = actorSystem;
    this.executionContext = executionContext;
    // instance = new AdminServices();
    this.initialize(Id);
}

public ServiceResult initialize(Integer Id) {
    System.out.println("Service initialize method called");

    try {

        this.actorSystem.scheduler().schedule(Duration.create(5, TimeUnit.SECONDS),
                 Duration.create(1, TimeUnit.MINUTES), // delay
                () -> adminTaskScheduler(3), this.executionContext);
        System.out.println("This is scheduler class");

    } catch (Exception e) {
        e.printStackTrace();
        return createServiceResult(FAILURE_STATUS);
    }
    return createServiceResult(SERVICE_SUCCESS);
}
}

我的DAO.Java

public AppUserModel getUserForUserId(Integer inUserId) {
    return Ebean.find(AppUserModel.class).where().eq("id", inUserId).and().eq("isDeleted", 0).findUnique();
}

和MyCommand.java，我试图从其中发送ID并启动调度程序。

public int execute() {
    try {

        promiseResult = CompletableFuture.supplyAsync(() -> {
            System.out.println("This is Command class");
            ServiceResult serviceResult = AdminServices.getInstance().initialize(3);
            //System.out.println("User Id" + appUserModel.getId());
            ResponseData responseData = prepareJsonReponse(serviceResult);
            result = responseData.getResult();
            statusCode = responseData.getStatus();
            return result;
        });
        /*
         * promiseResult.handle((result, error) -> { if (error != null) {
         * return prepareJsonReponse(SERVER_ERROR_STCODE); } else { return
         * CompletableFuture.completedFuture(result); } });
         */
        /*
         * .thenApply(result -> { return result; }).;
         */
        if (promiseResult != null)
            return STATUS_OK;

    } catch (Exception e) {
        statusCode = SERVER_ERROR_STCODE;
        e.printStackTrace();
        return STATUS_INTERNAL_SERVER_ERROR;
    }
    return STATUS_BAD_REQUEST;
}

上面是我用来创建基于调度程序的员工ID的代码。