JSON Reader AssertionError when doInBackground (Android 7, 8)

Hi guys, in latest Lottie Android version (2.5.0) we are having several crashes at doInBackground() method. This crash is only happening on Android 7 and 8 versions.

Here is our animation preloading code:

class LottieAnimations {

    companion object {

        @JvmStatic
        var willyWaiting: LottieAnimation? = null
        var specialBonusCollectCoins: LottieAnimation? = null
        var specialBonusCollectGems: LottieAnimation? = null

        @JvmStatic
        fun load(context: Context) {
            fromAssetFileName(context, "animation/waiting_lottie/data.json") {
                it?.let { willyWaiting = LottieAnimation(it, "animation/waiting_lottie/images") }
            }

            fromAssetFileName(context, "animation/special_bonus_collect_coins/data.json") {
                it?.let { specialBonusCollectCoins = LottieAnimation(it, "animation/special_bonus_collect_coins/images") }
            }

            fromAssetFileName(context, "animation/special_bonus_collect_gems/data.json") {
                it?.let { specialBonusCollectGems = LottieAnimation(it, "animation/special_bonus_collect_gems/images") }
            }
        }
    }

}

Here is the StackTrace:

OS Version: 8.0.0 Device: Xperia X RAM Free: 38.5% Disk Free: 60.8%

#0. Crashed: AsyncTask #4 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)

–

Fatal Exception: 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.lang.AssertionError at android.util.JsonReader.peek(JsonReader.java:363) at android.util.JsonReader.expect(JsonReader.java:308) at android.util.JsonReader.beginObject(JsonReader.java:293) at com.airbnb.lottie.parser.LottieCompositionParser.parse(SourceFile:42) at com.airbnb.lottie.LottieComposition$Factory.fromJsonSync(SourceFile:269) at com.airbnb.lottie.parser.AsyncCompositionLoader.doInBackground(SourceFile:22) at com.airbnb.lottie.parser.AsyncCompositionLoader.doInBackground(SourceFile:12) at android.os.AsyncTask$2.call(AsyncTask.java:333) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at java.lang.Thread.run(Thread.java:764)

#0. Crashed: AsyncTask #4 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)

#1. pool-2-thread-1 at java.lang.Object.wait(Object.java) at java.lang.Thread.parkFor$(Thread.java:2135) at sun.misc.Unsafe.park(Unsafe.java:358) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:230) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2101) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1132) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1087) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at java.lang.Thread.run(Thread.java:764)

#2. httpThread at android.os.MessageQueue.nativePollOnce(MessageQueue.java) at android.os.MessageQueue.next(MessageQueue.java:375) at android.os.Looper.loop(Looper.java:225) at android.os.HandlerThread.run(HandlerThread.java:65)

#3. ConnectivityThread at android.os.MessageQueue.nativePollOnce(MessageQueue.java) at android.os.MessageQueue.next(MessageQueue.java:375) at android.os.Looper.loop(Looper.java:225) at android.os.HandlerThread.run(HandlerThread.java:65)

#4. pool-3-thread-1 at java.lang.Object.wait(Object.java) at java.lang.Thread.parkFor$(Thread.java:2135) at sun.misc.Unsafe.park(Unsafe.java:358) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:190) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2059) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1120) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1087) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at java.lang.Thread.run(Thread.java:764)

Any ideas?

Tnx in advance

[TobiasReich]

We are having the same issues (Lottie 2.5.5) - only Android 8. So hope to find a fix soon.

Caused by java.lang.AssertionError
       at android.util.JsonReader.peek(JsonReader.java:363)
       at android.util.JsonReader.expect(JsonReader.java:308)
       at android.util.JsonReader.beginObject(JsonReader.java:293)
       at com.airbnb.lottie.parser.LottieCompositionParser.parse(LottieCompositionParser.java:42)
       at com.airbnb.lottie.LottieComposition$Factory.fromJsonSync(LottieComposition.java:276)
       at com.airbnb.lottie.parser.AsyncCompositionLoader.doInBackground(AsyncCompositionLoader.java:22)
       at com.airbnb.lottie.parser.AsyncCompositionLoader.doInBackground(AsyncCompositionLoader.java:12)
       at android.os.AsyncTask$2.call(AsyncTask.java:333)
       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
       at java.lang.Thread.run(Thread.java:764)

I’m aware this is probably an Android issue (not Lottie) but perhaps you could add an option of wrapping this in a try-catch block or something so not the whole app crashes when this happens?!

[awenger]

We don’t use lottie-android, but see a similar crash in our app:

Fatal Exception: java.lang.AssertionError
       at android.util.JsonReader.peek(JsonReader.java:363)
       ...

So far we only observed crashes on devices with 8.0.0 and 8.1.0. I currently assume it is a bug in JsonReader, so I opened a bug report here: https://issuetracker.google.com/issues/79920590