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Android API get attribute as list or null

I'm creating an API that return Vaccination Info of people. The code below is that I'm getting list of vaccination IDs. If people injected 1 or more, the API working fine, I get a list as expected. Vice versa, if they haven't injected, the data on server is null. In that case, when I make an API call I will get the error that vaccinationInfoList is null, but it's still have the size 1. I tried as below to locate the error but it's cannot catch any exception.
try {
Response<List<Vaccination_info>> res = call.execute();
Log.v("RES" , String.valueOf(res));
if (res.body() != null){
try {
vaccinationInfoList = res.body();
}
catch (Exception n){
Log.v("ExceptionN" , String.valueOf(n));
}
} else {
Log.v("NULL" , "NULL");
}
} catch (IOException e) {
e.printStackTrace();
}
Log.v("VACC", String.valueOf(vaccinationInfoList.size()));
Can someone recommend me a solution or a different aproach? Thanks so much

If you have access and can change api response so change response from null to empty array list []
If not You can use com.google.gson.JsonElement

How to you implements mongoTemplate.findDistinct()?

Im trying to use the findDistinct function from mongoTemplate but i always retrieve an empty result list.
Can you help me out to spot the problem ? Or maybe you have a simpliest way to do it
NB:
I do have data in my collection
(on a basic find, i fetch more than 300 results in the list but all of this result are the same excepting on one key, i want all the distinct object from their NAME value for instance )
I tryied this :
List<DiffusionListImpl> list = new ArrayList<>();
try{
query = new Query(Criteria.where("CUSTOMERNUMBER").is(1));
list = mongoTemplate.findDistinct(query, KeyWhereIWantTheDistinct, collectionName,
KlassResultModel.class);
} catch (MongoException e) {
logger.error("MongoException: " + e);
} catch (Exception e) {
logger.error("Error: " + e);
}
return list;

My bad, i misread the documentation.
But i find it akward to have this kind of comportement of this function.
I have to make a call to the DB to fetch a list of distinct value and then make another Call of the same DB to retrieve the object.
Is there any way to do it in one call? (Performance issue)

It can be done in one DB call, use below code.
final List<DiffusionListImpl> result =
IteratorUtils.toList(this.mongoTemplate.getCollection("collectionName")
.distinct("fieldName", query.getQueryObject(), DiffusionListImpl.class)
.iterator());
for IteratorUtils you can use apache
import org.apache.commons.collections4.IteratorUtils;

Android ListView still contains one item after removing everything

I have a ListView in Android that contains Orders. When you click on a specific order you can choose whether to remove it or not. When the list contains >1 items, the removed item does not appear on the ListView anymore. However, when the list size is 1 and you remove the only order left, the order does get removed from the list but not from the ListView. So you can still see it on the screen, but if you try to open it an error message is shown "Can't open this order.".
When you return to the Home screen and reopen the ListView, the order is properly removed, and an empty list is shown. However, I'm not sure why this is happening. Here is some sample code:
method {
VerkoopOrder orderToBeSaved = CurrentOrder;
UUID CurrentID = CurrentOrder.getId();
orderToBeSaved.setId(null);
String Result = OrderHelper.SaveOrder(orderToBeSaved, APIKey);
JSONObject json = new JSONObject(Result);
String res = json.getString("nummer");
if (Result != null) {
Messager.showMessage(getString(R.string.Saved), getString(R.string.OrderSavedAs) + " " + res, true, this);
DeleteCurrentOrder(APIKey, CurrentID);
UnsavedOrdersActivity.UnsavedOrderAdapter.notifyDataSetChanged();
}
}
public void DeleteCurrentOrder(String APIKey, UUID OrderId) {
try {
OrderScanPreference orderScanPreference = OrderScanPreference.GetCurrentSavedPreference(this, getString(R.string.OrderScanUserPreference));
String finalAPIKey = APIKey;
try {
for (UnsavedOrderPreference unsavedOrderPreference : orderScanPreference.unsavedOrderPreferences) {
if (unsavedOrderPreference.APIAdministrationToken.equals(finalAPIKey)) {
unsavedOrderPreference.UnsavedOrders.removeIf(r -> r.getId().equals(OrderId)); //Order gets removed from the list!
}
}
orderScanPreference.Save(this, getString(R.string.OrderScanUserPreference));
} catch (Throwable throwable) {
//TODO
}
} catch (Exception ex) {
Log.d("Exception: ", ex.toString());
//TODO
}
}
This code was written by a colleague but he left the company a few weeks ago, so I have to finish his project. Let me know if you require more information.

I placed a check to see if the list is empty or not. If it is, it reassigns the Adapter to the ListView so the list gets cleared completely.
Not a great fix, so I won't accept this as the answer yet. Only if there are no better answers soon I'll accept this.

Getting All YouTube Video Ids/Urls From Video Manager

I'm using Selenium to log into my Google account and to visit YouTube.
Now on the video manager I would like to get all of my video ids. I tried copying the CSSSelector or XPath which the developer tools in Chrome give me but each of them contain the video id which makes them impossible to use like this:
List<WebElement> allVideoUrls = driver.findElements(By.cssSelector("my-selector-which-gives-all-videos-on-page"));
Note that I have to be logged in to be able to "see" unlisted or private videos as well so that's required.
So far I have a bad implementation which sometimes fails to work for some reason. I firstly get all the links on the page and only return the ones which are for editing a video. To avoid a StaleElementReferenceException I'm retrieving all links again inside the loop.
public void getVideoInformation()
{
// Visit video manager
driver.get("https://www.youtube.com/my_videos?o=U");
// Wait until video list has loaded
new WebDriverWait(driver, 10).until(ExpectedConditions
.visibilityOfElementLocated(By
.cssSelector("#vm-playlist-video-list-ol")));
// Return all links on page
List<WebElement> allLinks = driver.findElements(By.tagName("a"));
HashSet<String> videoLinks = new HashSet<>();
for (int linksIndex = 0; linksIndex < allLinks.size(); linksIndex++)
{
String link = driver.findElements(By.tagName("a")).get(linksIndex)
.getAttribute("href");
try
{
if (link.contains("edit"))
{
System.out.println(link);
// No duplicates
videoLinks.add(link);
}
} catch (Exception error)
{
error.printStackTrace();
}
}
// ...
}
I'm fine with the fact that I need to load every other page as well to get all the videos but please help me to find an efficient/reliable way of getting the video ids.

Get an array of user photos using FQL

I'm to get a list of the users photos (one's they've been tagged in) using FQL.
Basically I've go an array object like so: _imageAddressArray.
I can retrieve the users' photos using graphApi so I know it works, problem with graphAPi is that it's too slow (+15 seconds min for 100 photos).
So far I've got:
//New Stuff
FQL fql = new FQL(facebook);
String FQLResult = null;
try
{
_userGallery = graphApi.getPhotosMy(_noOfPhotos);
FQLResult = fql.fqlQuery("SELECT object_id, src_small FROM photo");
}
catch (EasyFacebookError e)
{
e.printStackTrace();
}
System.out.println("FQL Result" + FQLResult);
This returns the error: 601, any ideas anyone?
Of course ideally FQLResult will be a string[] (string array)

You're getting an error because you don't have a WHERE clause in your FQL statement that references one of the indexed columns -- shown with a "*" here
To get the photos using FQL that your user has been tagged in, try this:
SELECT object_id, src_small FROM photo WHERE object_id IN
(SELECT object_id FROM photo_tag WHERE subject = me())