doInBackground error

[altbeacon]

doInBackground error

[davidgyoung]

It looks like you have code that somehow modifies the BeaconParser array after the service is started, which does not look to me like it is possible with the latest code. Can you tell me the version of the library you are using?

[logo17]

Thank you for your attention. I'm using the "android-beacon-library-2.0.aar" version. I downloaded it from "http://altbeacon.github.io/android-beacon-library/download.html".

[mturki]

i have approximatively the same. And i use last 2.0 version (without any modification) :

java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
at java.util.HashMap$KeyIterator.next(HashMap.java:833)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator.org.altbeacon.beacon.distance.DistanceCalculator findCalculatorForModel(org.altbeacon.beacon.distance.AndroidModel)(Unknown Source)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator.access$600(Unknown Source)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator$1.void onComplete(java.lang.String,java.lang.Exception,int)(Unknown Source)
at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.java.lang.Void doInBackground(java.lang.Void[])(Unknown Source)
java.lang.Object doInBackground(java.lang.Object[])
at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.java.lang.Void doInBackground(java.lang.Void[])(Unknown Source)
java.lang.Object doInBackground(java.lang.Object[])
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
... 4 more

[davidgyoung]

The core issue is that the library fails to block updates of the beaconParsers after the service has started. This needs to be fixed.

As a temporary workaround, make sure you make an calls to:

beaconManager.getBeaconParsers().add(new BeaconParser().
           setBeaconLayout(...));

before the BeaconService is started. If using the RegionBootstrap class, put this line before it is constructed. If calling beaconManager.bind(this), put this line before that call.

[gelldur]

@mturki here is fix for it: #245

[ryot]

This crash has been reoccurring in 2.9.2, see the recently added comments on PR #245

[TonyTangAndroid]

I have run into this crash on 2.12.2. Here is the stack trace

java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:353)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1441)
at java.util.HashMap$KeyIterator.next(HashMap.java:1465)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator.findCalculatorForModel(ModelSpecificDistanceCalculator.java:123)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator.findCalculatorForModelWithLock(ModelSpecificDistanceCalculator.java:105)
at org.altbeacon.beacon.distance.ModelSpecificDistanceCalculator$1.onComplete(ModelSpecificDistanceCalculator.java:251)
at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.doInBackground(ModelSpecificDistanceUpdater.java:30)
at org.altbeacon.beacon.distance.ModelSpecificDistanceUpdater.doInBackground(ModelSpecificDistanceUpdater.java:16)
at android.os.AsyncTask$2.call(AsyncTask.java:333)

[davidgyoung]

@TonyTangAndroid, do you know the OS version on which you have seen this crash?

[TonyTangAndroid]

Android 8.0 Google Pixel.
Sorry that I was too quick to paste the stack trace and forgot to provide this critical information.

[davidgyoung]

Fixed in #584