I am new to GWT. I have written a piece of code which makes asynchronous calls to the server. The server side code is running fine as seen through the logs. But on the client side I am getting a failure message.
I am trying to load large amount of data from the server. It seems like the async call times out before the entire data is returned from the server. Is there a way I can increase the timeout of the call? or is there any other issue with my code?
public MapDataServiceFacadeAsync getMapDataServiceInstance()
{
if (mapDataService == null)
{
mapDataService = MapDataServiceFacade.Util.getInstance();
}
return mapDataService;
public void setTreeInstance(final String productName, final Object invObject, final boolean isToLoadTickets, final SearchItem search)
{
refreshSearch = search;
this.inventoryMapPanel = (InventoryMapPanel) invObject;
long startTime = System.currentTimeMillis();
getMapDataServiceInstance().getProductTree(userProfile, isToLoadTickets, search, new AsyncCallback()
{
public void onFailure(Throwable caught)
{
CommonMapUI.loadLabel(false);
Window.alert("Failed to Load Tree. Please try again");
}
public void onSuccess(Object result)
{
tmpData = (MapItem[]) ((HashMap) result).get("tree");
if (tmpData == null && Count < 3)
{
Count++;
setTreeInstance(productName, invObject, isToLoadTickets, search);
}
else
{
buildProductTree(result, invObject, isToLoadTickets);
}
}
});
}
It is always throwing the error "Failed to load Tree" if I try and retrieve large amount of data. It works fine if small amount of data is to be loaded.
Interface:
public interface MapDataServiceFacadeAsync {
public void getProductTree(CommonUserProfile user, boolean isToLoadTickets,SearchItem search, AsyncCallback asynCall);
Any help would be appreciated.
Related
I am using libgdx and robovm.
I get an error when I try to submit the score to the leaderboard on GameCenter on iOS. I am able to show the leaderboard. This is the error I get:
*** Terminating app due to uncaught exception 'GKInvalidArgumentException', reason: 'A GKScore must specify a leaderboard.'
libc++abi.dylib: terminating with uncaught exception of type NSException
It is similar to this SO-post, but it is objective-c so I dont understand the answer.
This is my code for showing the leaderboard (this works)
public void getLeaderboardGPGS() {
// If player is not authenticated, do nothing
if (!GKLocalPlayer.getLocalPlayer().isAuthenticated()) {
return;
}
GKGameCenterViewController gameCenterView = new GKGameCenterViewController();
gameCenterView.setGameCenterDelegate(new GKGameCenterControllerDelegateAdapter() {
#Override
public void didFinish (GKGameCenterViewController gameCenterViewController) {
dismissViewControllerAndNotifyListener(gameCenterViewController, GKGameCenterViewControllerState.Leaderboards);
}
});
gameCenterView.setViewState(GKGameCenterViewControllerState.Leaderboards);
gameCenterView.setLeaderboardIdentifier(identifier);
keyWindow.getRootViewController().presentViewController(gameCenterView, true, null);
}
This is my code for submiting the score (this does not work)
public void submitScoreGPGS(int score, MyLeaderBoardCallback callback) {
// If player is not authenticated, do nothing
if (!GKLocalPlayer.getLocalPlayer().isAuthenticated()) {
//listener.scoreReportFailed(buildUnauthenticatedPlayerError());
Gdx.app.log("Gamecenter","Notlogedin");
return;
}
GKScore scoreReporter = new GKScore(identifier);
scoreReporter.setValue(score);
scoreReporter.setLeaderboardIdentifier(identifier);
//scoreReporter.setShouldSetDefaultLeaderboard(true);
//scoreReporter.setContext(0);
NSArray<GKScore> scores = new NSArray<GKScore>(scoreReporter);
Gdx.app.log("Gamecenter","Report socre");
GKScore.reportScores(scores, new VoidBlock1<NSError>() {
#Override
public void invoke (NSError error) {
if (error != null) {
Gdx.app.log("Gamecenter","scorereportfailed");
} else {
Gdx.app.log("Gamecenter","scorereportcompleted");
}
}
});
}
Anyone knows what the problem might be? I have tried googleing but there is little information about "robovm and gamekit/gamecenter".
The variable that contained the leaderboard id was garbage collected for some reason. Had to hard-code the string at scoreReporter.setLeaderboardIdentifier("my hard coded id"); . Weird....
I am new to webservices and also REST. I am trying to send a message as a post request to a rest service using rest java client.I am trying to get response of previous requests also(everything in json format). So, am storing the message objects into an arraylist and sending the list as a reponse. But I am not able to get the previous messages. Please tell me if am doing anything wrong.
This is my message model class.
public class Messages {
private String id;
private String message;
public Messages() {
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
the following is my webservice to receive a message object and return a json array.
#Path("/json/messages")
public class JSONMessages {
public List<Messages> list = new ArrayList<Messages>();
List<Messages> getAllMessages(Messages m){
list.add(m);
return list;
}
#POST
#Path("/post")
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_JSON)
public Response MessageListInJSON(Messages msg) {
System.out.println("message saved");
if(!(msg.getId().equals("1"))){
String output ="Invalid User";
return Response.ok(output).build();
}
else{
return Response.ok(getAllMessages(msg)).build();
}
}
}
Finally, the following is my client side code
public class ClientPost {
public static void main(String[] args) {
try {
ClientConfig clientConfig = new DefaultClientConfig();
Client client = Client.create(clientConfig);
WebResource webResource = client
.resource("http://localhost:8050/lab.rest.webservices/rest/json/messages/post");
//for(int i=0;i<5;i++){
String input = "{\"id\":\"1\", \"message\":\"hey there!\"}";
ClientResponse response = webResource.accept("application/json").type("application/json")
.entity(input).post(ClientResponse.class);
if (response.getStatus() !=200 ) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatus());
}
System.out.println("Output from Server .... \n");
String output = response.getEntity(String.class);
System.out.println(output+"\n");
}
catch (Exception e) {
e.printStackTrace();
}
} }
Now, what I am expecting to see is the message I sent along with the previous responses stored in the array list(which were sent by running the client multiple times manually for now) but always am ending up with only the current message.
output:
Output from Server ....
[{"id":"1","message":"hey there!"}]
To be precise, what I want as output when i run my client several times(or put the try block in loop) is as follows which i am unable to get.
Output from Server ....
[{"id":"1","message":"hey there!"},{"id":"1","message":"hey there!"},{"id":"1","message":"hey there!"},{"id":"1","message":"hey there!"}] .
Resources in JAXRS aren't singletons. That means that for each request, the class JSONMessages is instantiated. So you lose the content of the attribute list. Changing it to static could fix your problem.
There is an annotation Singleton to change this behavior. In this case the resource will be managed as singleton and not in request scope. Here is a sample:
#Singleton
#Path("/json/messages")
public class JSONMessages {
(...)
}
Otherwise, be careful of concurrent accesses on your list. See this question for more details: java concurrent Array List access.
Hope it helps you,
Thierry
I am building an android application that shows autocomplete feature and fetches autocomplete predictions in google maps using - GeoDataApi.getAutocompletePredictions. I followed this tutorial - https://github.com/googlesamples/android-play-places/blob/master/PlaceComplete/Application/src/main/java/com/example/google/playservices/placecomplete/PlaceAutocompleteAdapter.java
But somehow this is not working fine for me.
My class is this -
public class GooglePlacesAutoCompleteAdapter extends ArrayAdapter implements Filterable {
private ArrayList<PlaceAutocomplete> mResultList;
GoogleApiClient mGoogleApiClient;
private LatLngBounds mBounds;
private AutocompleteFilter mPlaceFilter;
int radius = 500;
public GooglePlacesAutoCompleteAdapter(Context context, int textViewResourceId, GoogleApiClient googleApiClient,
Location lastLocation, AutocompleteFilter filter) {
super(context, textViewResourceId);
LatLng currentLatLng = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude());
mBounds = Utility.boundsWithCenterAndLatLngDistance(currentLatLng, 500, 500);
mGoogleApiClient = googleApiClient;
mPlaceFilter = filter;
}
#Override
public int getCount() {
return mResultList.size();
}
#Override
public PlaceAutocomplete getItem(int index) {
return mResultList.get(index);
}
#Override
public android.widget.Filter getFilter() {
Filter filter = new Filter() {
#Override
public FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
if (constraint != null && constraint.length() > 3 && constraint.length()%3 == 1) {
// Retrieve the autocomplete results.
mResultList = autocomplete(constraint.toString());
// Assign the data to the FilterResults
filterResults.values = mResultList;
filterResults.count = mResultList.size();
}
return filterResults;
}
#Override
public void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
return filter;
}
public ArrayList<PlaceAutocomplete> autocomplete(String input) {
if (mGoogleApiClient.isConnected()) {
// Submit the query to the autocomplete API and retrieve a PendingResult that will
// contain the results when the query completes.
PendingResult results = Places.GeoDataApi.getAutocompletePredictions(mGoogleApiClient, input.toString(),
mBounds, mPlaceFilter);
// This method should have been called off the main UI thread. Block and wait for at most 60s
// for a result from the API.
AutocompletePredictionBuffer autocompletePredictions = (AutocompletePredictionBuffer)results.await(60, TimeUnit.SECONDS);
// Confirm that the query completed successfully, otherwise return null
final Status status = autocompletePredictions.getStatus();
if (!status.isSuccess()) {
//Toast.makeText(getContext(), "Error contacting API: " + status.toString(),Toast.LENGTH_SHORT).show();
//Log.e(TAG, "Error getting autocomplete prediction API call: " + status.toString());
autocompletePredictions.release();
return null;
}
// Copy the results into our own data structure, because we can't hold onto the buffer.
// AutocompletePrediction objects encapsulate the API response (place ID and description).
Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
ArrayList resultList = new ArrayList<>(autocompletePredictions.getCount());
while (iterator.hasNext()) {
AutocompletePrediction prediction = iterator.next();
// Get the details of this prediction and copy it into a new PlaceAutocomplete object.
resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getDescription()));
}
// Release the buffer now that all data has been copied.
autocompletePredictions.release();
return resultList;
}
//Log.e(TAG, "Google API client is not connected for autocomplete query.");
return null;
}
class PlaceAutocomplete {
public CharSequence placeId;
public CharSequence description;
PlaceAutocomplete(CharSequence placeId, CharSequence description) {
this.placeId = placeId;
this.description = description;
}
#Override
public String toString() {
return description.toString();
}
}
}
The line on which GeoDataApi.getAutocompletePredictions is called, goes into an internal classes called - Filter.java, Log.java, handler.java and then Looper.java and loops there indefinetly on line 121 of Looper.java (I am sure studio sdk will show the code for Looper.java).
It is not even throwing an error, or going to the next line, it just does not work. Plus, I am not able to see the stack trace of an error.
This is the code snippet which is calling this -
if (mLastLocation != null) {
GooglePlacesAutoCompleteAdapter placesAdapter = new GooglePlacesAutoCompleteAdapter(this, R.layout.item_list, mGoogleApiClient, mLastLocation, null);
autoCompView.setAdapter(placesAdapter);
autoCompView.setOnItemClickListener(this);
}
Can someone please tell me what I am doing wrong here? Please any help will be greatly appreciated. I need to get this working as soon as I could.
PS - I am passing mPlaceFilter as null here.
Enable the Google Places API for Android in developers console
I have a list of theaters and I created a secondary tile from my application to navigate directly to specific theater. I pass the id of the theater in query string :
I load the theaters from a WCF service in the file "MainViewModel.cs"
In my home page, I have a list of theaters and I can navigate to a details page.
But when I want to navigate from the tile, I have an error...
The Tile :
ShellTile.Create(new Uri("/TheaterDetails.xaml?selectedItem=" + theater.idTheater, UriKind.Relative), tile, false);
My TheaterDetails page :
public partial class TheaterDetails : PhoneApplicationPage
{
theater theater = new theater();
public TheaterDetails()
{
InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (!App.ViewModel.IsDataLoaded)
{
App.ViewModel.LoadData();
}
if (DataContext == null)
{
string selectedIndex = "";
if (NavigationContext.QueryString.TryGetValue("selectedItem", out selectedIndex))
{
int index = int.Parse(selectedIndex);
theater = (from t in App.ViewModel.Theaters
where t.idTheater == index
select t).SingleOrDefault();
DataContext = theater;
....
....
....
The error :
https://dl.dropboxusercontent.com/u/9197067/error.png
Like if the data were not loaded...
Do you have an idea where the problem come from ?
The solution could be easy but I am a beginner... Maybe it's because I load the data asynchronously and the application doesn't wait until it's done...
Thanks
EDIT :
My LoadData() method :
public void LoadData()
{
client.GetTheatersCompleted += new EventHandler<ServiceReference1.GetTheatersCompletedEventArgs>(client_GetTheatersCompleted);
client.GetTheatersAsync();
// Other get methods...
this.IsDataLoaded = true;
}
private void client_GetTheatersCompleted(object sender, ServiceReference1.GetTheatersCompletedEventArgs e)
{
Theaters = e.Result;
}
You should check to see which variable is actually null. In this case it looks to be Theaters (otherwise the error would have thrown earlier).
Since Theaters is populated from a web call it is most likely being called asynchronously, in other words when you return from LoadData() the data is not yet there (it's still waiting for the web call to come back), and is waiting for the web service to return its values.
Possible solutions:
Make LoadData() an async function and then use await LoadData(). This might require a bit of rewriting / refactoring to fit into the async pattern (general introduction to async here, and specific to web calls on Windows Phone here)
A neat way of doing this that doesn't involve hacks (like looping until the data is there) is to raise a custom event when the data is actually populated and then do your Tile navigation processing in that event. There's a basic example here.
So the solution that I found, thanks to Servy in this post : Using async/await with void method
I managed to use async/await to load the data.
I replaced my LoadData() method by :
public static Task<ObservableCollection<theater>> WhenGetTheaters(ServiceClient client)
{
var tcs = new TaskCompletionSource<ObservableCollection<theater>>();
EventHandler<ServiceReference1.GetTheatersCompletedEventArgs> handler = null;
handler = (obj, args) =>
{
tcs.SetResult(args.Result);
client.GetTheatersCompleted -= handler;
};
client.GetTheatersCompleted += handler;
client.GetTheatersAsync();
return tcs.Task;
}
public async Task LoadData()
{
var theatersTask = WhenGetTheaters(client);
Theaters = await theatersTask;
IsDataLoaded = true;
}
And in my page :
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
if (!App.ViewModel.IsDataLoaded)
{
await App.ViewModel.LoadData();
}
I am trying to implement jsr-179 APi into Nokia Symbian phone for periodic location update using setLocationListener through J2me. In emulator it is working fine. While I installed Midlet on the device nokia 5230, it is given NullPointerException and the application is automatically terminating. What might be possible causes?
Below is my class, I am instantiating object for this class on a form in netbeans
class MovementTracker implements LocationListener {
LocationProvider provider;
Location lastValidLocation;
UpdateHandler handler;
boolean done;
public MovementTracker() throws LocationException
{
done = false;
handler = new UpdateHandler();
new Thread(handler).start();
//Defining Criteria for Location Provider
/*
Criteria cr = new Criteria();
cr.setHorizontalAccuracy(500);
*/
//you can place cr inside getInstance
provider = LocationProvider.getInstance(null);
//listener,interval,timeout,int maxAge
//Passing -1 selects default interval
// provider.setLocationListener(MovementTracker.this, -1, -1, -1);
provider.setLocationListener(MovementTracker.this, -1, 30000, 30000);
}
public void locationUpdated(LocationProvider provider, Location location)
{
handler.handleUpdate(location);
batteryLevel = System.getProperty("com.nokia.mid.batterylevel");
sn = System.getProperty("com.nokia.mid.networksignal");
localTime = System.currentTimeMillis();
Send_Location();
}
public void providerStateChanged(LocationProvider provider, int newState)
{
}
class UpdateHandler implements Runnable
{
private Location updatedLocation = null;
// The run method performs the actual processing of the location
public void run()
{
Location locationToBeHandled = null;
while (!done)
{
synchronized(this)
{
if (updatedLocation == null)
{
try
{
wait();
}
catch (Exception e)
{
// Handle interruption
}
}
locationToBeHandled = updatedLocation;
updatedLocation = null;
}
// The benefit of the MessageListener is here.
// This thread could via similar triggers be
// handling other kind of events as well in
// addition to just receiving the location updates.
if (locationToBeHandled != null)
processUpdate(locationToBeHandled);
}
try
{
Thread.sleep(10000); //Sleeps for 10 sec & then sends the data
}
catch (InterruptedException ex)
{
}
}
public synchronized void handleUpdate(Location update)
{
updatedLocation = update;
notify();
}
private void processUpdate(Location update)
{
latitude = update.getQualifiedCoordinates().getLatitude();
longitude = update.getQualifiedCoordinates().getLongitude();
altitude = update.getQualifiedCoordinates().getAltitude();
}
}
}
public MovementTracker() throws LocationException
...
I have not written any code for handling LocationException.
No code is very dangerous practice, just search the web for something like "java swallow exceptions".
It is quite possible that because of implementation specifics Nokia throws LocationException where emulator does not throw it. Since you don't handle exception this may indeed crash you midlet at Nokia - and you wouldn't know the reason for that because, again, you have written no code to handle it.
How can I catch that exception?
The simplest thing you can do is to display an Alert with exception message and exit the midlet after user reads and dismisses alert