我正在嘗試拉動對象類型的Popularity字段Number。Room需要此對象的類型轉換器，我在下面進行了集成：public class NumberConverter {@TypeConverterpublic static Number toNumber(Integer integer){    return integer == null ? null : toNumber(integer); }@TypeConverterpublic static Integer toInt(Number number){    return number == null ? null : number.intValue();  }}加載應用程序時，我立即收到引用以下行的StackOverFlow錯誤：        return number == null ? null : number.intValue();注意：我還Executors用于異步處理讀寫：public class AppExecutors{//for Singleton Instantiationprivate static final Object LOCK = new Object();private static AppExecutors sInstance;private final Executor diskIO;private final Executor mainThread;private final Executor networkIO;public AppExecutors(Executor diskIO, Executor mainThread, Executor networkIO) {    this.diskIO = diskIO;    this.mainThread = mainThread;    this.networkIO = networkIO;}public static AppExecutors getsInstance(){    if (sInstance == null){        synchronized (LOCK){            sInstance = new AppExecutors(Executors.newSingleThreadExecutor(),                    Executors.newFixedThreadPool(3),                    new MainThreadExecutor());        }    }    return sInstance;};public Executor diskIO(){return diskIO;};public Executor mainThread(){return mainThread;}public Executor netWorkIO(){return networkIO;}private static class MainThreadExecutor implements Executor{    private android.os.Handler mainThreadHandler = new android.os.Handler(Looper.getMainLooper());    @Override    public void execute(@NonNull Runnable runnable) {        mainThreadHandler.post(runnable);    }   }}