Question

A few days ago the push notification for Android devices was working fine because I had around 1000 device tokens so far in my database, but today it’s not working because it’s reached to around 1500 device tokens. I’m getting java.io.IOException on the server side.

java.io.IOException: Server returned HTTP response code: 400 for URL: https://android.googleapis.com/gcm/send
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1491)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1485)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:234)
    at com.google.android.gcm.server.Sender.sendNoRetry(Sender.java:363)
    at com.google.android.gcm.server.Sender.send(Sender.java:261)
    at com.orange.server.ws.androidpns.androidPNHandler.run(androidPNHandler.java:58)
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: https://android.googleapis.com/gcm/send
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1436)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:379)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:318)
    at com.google.android.gcm.server.Sender.sendNoRetry(Sender.java:362)
    ... 2 more

I checked for one device token it worked fine but when there are to many device tokens (>800) in my database table I’m getting this above exception. Here is my server code for GCM.

Sender sender = new Sender("SENDER-ID");
AndroidPNSEntityHandler androidPNSEntityHandler = new AndroidPNSEntityHandler();
ArrayList<String> androidDeviceIds = androidPNSEntityHandler.getList();

/* I checked by adding only one device token to this arraylist like
this **androidDeviceIds.add("Android-Device-Token");**
It worked fine...
*/

if(androidDeviceIds.size() != 0)
{
    String title;
    if(!isOrangeCall)
        title = "title";
    else
        title = "oTitle";

    Message message = new Message.Builder()
                .collapseKey(pnsCollapseKey)
                .timeToLive(86400)
                .addData(title,msgTitle)
                .addData("content",msgContent)
                .build();
    try
    {
        MulticastResult result = sender.send(message, androidDeviceIds, 5);
        if (result.getResults() != null) 
        {
            int failureMsgs = result.getFailure();
            int canonicalRegId = result.getCanonicalIds();
            List<Result> multicastResults = result.getResults();
            Boolean flag =true;
            int total;
            if(failureMsgs != 0 || canonicalRegId != 0)
            {

                for(total = 0;flag;total++)
                {
                    if(canonicalRegId != 0)
                    {
                        String tempCanId = multicastResults.get(total).getCanonicalRegistrationId(); 
                        if( tempCanId != null)
                        {
                            if(androidPNSEntityHandler.deleteDuplicate(androidDeviceIds.get(total), tempCanId))
                                canonicalRegId--;
                        }
                    }
                    if(failureMsgs != 0)
                    {
                        if(multicastResults.get(total).getErrorCodeName().equals(Constants.ERROR_NOT_REGISTERED))
                        {
                            if(androidPNSEntityHandler.deleteUid(androidDeviceIds.get(total)));
                            failureMsgs--;
                        }
                    }
                    if(canonicalRegId == 0 && failureMsgs == 0)
                        flag = false;
                }

            }

        }

    }catch (java.lang.IllegalArgumentException e)
    {
        e.printStackTrace();
    }catch (InvalidRequestException e)
    {
        e.printStackTrace();
    }catch (java.io.IOException e)
    {
        e.printStackTrace();
    }catch (Exception e) 
    {
        e.printStackTrace();
    }
}

Please guide me in resolving this issue…

Answer 1

The docs make it quite clear that 1000 is the limit:

registration_ids

A string array with the list of devices (registration IDs) receiving
the message. It must contain at least 1 and at most 1000
registration IDs. To send a multicast message, you must use JSON. For
sending a single message to a single device, you could use a JSON
object with just 1 registration id, or plain text (see below).
Required.