[Demonstration 1]

[Buggy Method]
@Override
public final T persistOrMerge(T entity) {
    LOG.debug("Start method persistOrMerge( {} )", entity);
    prePersistOrMerge(entity);
    if (isNew(entity)) {
        LOG.debug("Entity : {} does not exist in the database", entity);
        getSession().persist(entity);
        LOG.debug("Entity : {} has been persisted", entity);
    } else {
        LOG.debug("Entity : {} already exists in the database", entity);
        entity = (T) getSession().merge(entity);
        LOG.debug("Entity : {} has been merged", entity);
    }
    getSession().flush();
    LOG.debug("Changes have been flushed");
    getSession().refresh(entity);
    LOG.debug("Entity : {} has been refreshed", entity);
    return entity;
}

[Buggy Hunk]
if ( isNew( entity ) ) {

[Patch]
if ( entity.getId() == null ) {

[Demonstration 2]

[Buggy Method]
static String loadTitlePref(Context context, int appWidgetId, String suffix) {
    SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
    String titleValue = prefs.getString(PREF_PREFIX_KEY + appWidgetId + suffix, null);
    if (titleValue != null) {
        return titleValue;
    } else {
        return context.getString(R.string.appwidget_text);
    }
}

[Buggy Hunk]
String titleValue = prefs.getString(PREF_PREFIX_KEY + appWidgetId + suffix, null);

[Patch]
String titleValue = prefs.getString(PREF_PREFIX_KEY + appWidgetId + "" + suffix, null);

[Demonstration 3]

[Buggy Method]
private RemoteViews updateWidgetListView(Context context, int appWidgetId, boolean isSuccess) {
    Log.d("UpdateWidgetListView", Integer.toString(appWidgetId));
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.bab_widget_provider);
    Intent remoteIntent = new Intent(context, WidgetRemoteService.class);
    remoteIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    remoteIntent.setData(Uri.fromParts("content", String.valueOf(appWidgetId + randomNumber), null));
    int hour = CalendarUtil.getCurrentHour();
    String time;
    if (hour >= 0 && hour <= 9) {
        time = "아침";
    } else if (hour >= 10 && hour <= 15) {
        time = "점심";
    } else {
        time = "저녁";
    }
    if (isSuccess) {
        remoteViews.setRemoteAdapter(R.id.widget_list_view, remoteIntent);
        remoteViews.setEmptyView(R.id.widget_list_view, R.id.widget_empty_view);
        remoteViews.setTextViewText(R.id.dateViewWidget, SharedPreferenceUtil.loadValueOfString(context, SharedPreferenceUtil.PREF_APP_NAME, SharedPreferenceUtil.PREF_KEY_JSON).substring(5) + " " + time);
    } else {
        remoteViews.setEmptyView(R.id.widget_list_view, R.id.widget_download_fail_view);
        remoteViews.setTextViewText(R.id.dateViewWidget, CalendarUtil.getCurrentDate() + time);
    }
    Intent refreshIntent = new Intent(context, BabWidgetProvider.class);
    refreshIntent.setAction(WIDGET_REFRESH);
    refreshIntent.setData(Uri.fromParts("content", String.valueOf(appWidgetId + randomNumber), null));
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, refreshIntent, 0);
    remoteViews.setOnClickPendingIntent(R.id.dateViewWidget, pendingIntent);
    return remoteViews;
}

[Buggy Hunk]
remoteViews.setTextViewText(R.id.dateViewWidget, CalendarUtil.getCurrentDate() + time);

[Patch]
remoteViews.setTextViewText(R.id.dateViewWidget, CalendarUtil.getCurrentDate().substring(5) + " " + time);