Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object #142

beinghassandar1 · 2024-09-20T11:44:48Z

Hey guys, we are getting this crash on Android 13.

Can you guys please tell us why growth book is trying to deserialize <!DOCTYPE html><html lang="pt" from the backend instead of the actual json for features?

Lib Versions:

lib-growthbook = "1.1.61"
lib-growthbook-dispatcher = "1.0.0"
lib-growthbook = { module = "io.growthbook.sdk:GrowthBook", version.ref = "lib-growthbook" }
lib-growthbook-dispatcher = { module = "io.growthbook.sdk:NetworkDispatcherOkHttp", version.ref = "lib-growthbook-dispatcher" }

Initialization

  instance = GBSDKBuilder(
            apiKey = configHelper.getGrowthBookApiKey(),
            hostURL = configHelper.getGrowthBookUrl(),
            trackingCallback = { gbExperiment, gbExperimentResult ->
                Logging.d("$LOG_TAG - trackingCallback: Experiment Id: " + gbExperiment.key)
            },
            networkDispatcher = GBNetworkDispatcherOkHttp(httpClient),
            attributes = attributesMap,
        ).setRefreshHandler { isRefreshed, error ->
        }.setFeatureUsageCallback(featureUsageCallback = { featureKey, gbFeatureResult ->
        }).initialize()

Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object '{', but had '<' instead at path: $
JSON input: <!DOCTYPE html><html lang="pt".....
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:24)
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:32)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail(AbstractJsonLexer.kt:598)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$default(AbstractJsonLexer.kt:596)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json(AbstractJsonLexer.kt:233)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json$default(AbstractJsonLexer.kt:228)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.unexpectedToken(AbstractJsonLexer.kt:225)
       at kotlinx.serialization.json.internal.StringJsonLexer.consumeNextToken(StringJsonLexer.kt:74)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.beginStructure(StreamingJsonDecoder.kt:102)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
       at kotlinx.serialization.json.Json.decodeFromString(Json.kt:107)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:42)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:40)
       at com.sdk.growthbook.network.GBNetworkDispatcherOkHttp$consumeGETRequest$1$1.onResponse(GBNetworkDispatcherOkHttp.kt:61)
       at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
       at java.lang.Thread.run(Thread.java:1012)

Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException
Expected start of the object '{', but had 'EOF' instead at path: $ JSON input:
kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException (JsonExceptions.kt:24)
kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException (JsonExceptions.kt:32)
kotlinx.serialization.json.internal.AbstractJsonLexer.fail (AbstractJsonLexer.kt:598)
kotlinx.serialization.json.internal.AbstractJsonLexer.fail$default (AbstractJsonLexer.kt:596)
kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json (AbstractJsonLexer.kt:233)
kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json$default (AbstractJsonLexer.kt:228)
kotlinx.serialization.json.internal.AbstractJsonLexer.unexpectedToken (AbstractJsonLexer.kt:225)
kotlinx.serialization.json.internal.StringJsonLexer.consumeNextToken (StringJsonLexer.kt:77)
kotlinx.serialization.json.internal.StreamingJsonDecoder.beginStructure (StreamingJsonDecoder.kt:102)
com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize (FeaturesDataModel.kt:10)
com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize (FeaturesDataModel.kt:10)
kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue (StreamingJsonDecoder.kt:69)
kotlinx.serialization.json.Json.decodeFromString (Json.kt:107)
com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke (FeaturesDataSource.kt:42)
com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke (FeaturesDataSource.kt:40)
com.sdk.growthbook.network.GBNetworkDispatcherOkHttp$consumeGETRequest$1$1.onResponse (GBNetworkDispatcherOkHttp.kt:61)
okhttp3.internal.connection.RealCall$AsyncCall.run (RealCall.kt:519)
java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1137)
java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:637)
java.lang.Thread.run (Thread.java:1015)

The text was updated successfully, but these errors were encountered:

madhuchavva · 2024-09-20T23:43:19Z

@beinghassandar1 Do you mind checking if you're using the right endpoint/config ?

On cloud, it should be set to https://cdn.growthbook.io/
If self hosting, it should be set to your API_HOST.

beinghassandar1 · 2024-09-21T11:45:23Z

We are using our self hosted api endpoint. 99% of the users get correct data... Few users are getting Json from the same endpoint.

vazarkevych · 2024-09-23T12:14:14Z

Hi, @beinghassandar1. We will check that and get back to you asap.

beinghassandar1 · 2024-09-23T12:32:57Z

Thank you. Just fyi, we are seeing more crash reports for other Android versions too. Like Android 9, 11, 12, 13, 14.
All of them are either of the 2 crashes in the message above.

vazarkevych · 2024-09-23T12:42:13Z

Thank you for the detailed information. It will help us fix that.

vazarkevych · 2024-09-23T12:46:07Z

We are using our self hosted api endpoint. 99% of the users get correct data... Few users are getting Json from the same endpoint.

But what actually highlights that 1 percent with not right information. Maybe some version or some properties?

beinghassandar1 · 2024-09-23T13:00:56Z

Hhmm, hard to say. They are all on the latest build as we have recently released the new version with Growthbook sdk implementation.

beinghassandar1 · 2024-09-25T08:39:43Z

We are also getting more reports now but the crash is always something to do with wrong json.

    Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object '{', but had '<' instead at path: $
JSON input: <!DOCTYPE html><html><noscript.....
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:24)
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:32)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail(AbstractJsonLexer.kt:598)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$default(AbstractJsonLexer.kt:596)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json(AbstractJsonLexer.kt:233)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json$default(AbstractJsonLexer.kt:228)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.unexpectedToken(AbstractJsonLexer.kt:225)
       at kotlinx.serialization.json.internal.StringJsonLexer.consumeNextToken(StringJsonLexer.kt:74)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.beginStructure(StreamingJsonDecoder.kt:102)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
       at kotlinx.serialization.json.Json.decodeFromString(Json.kt:107)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:42)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:40)
       at com.sdk.growthbook.network.GBNetworkDispatcherOkHttp$consumeGETRequest$1$1.onResponse(GBNetworkDispatcherOkHttp.kt:61)
       at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
       at java.lang.Thread.run(Thread.java:1012)

madhuchavva · 2024-09-26T17:31:47Z

@beinghassandar1 Is there a pattern you see on these crash errors? the 1% users are consistently getting this error? if it consistent, is there a way for you to replicate this error?

vazarkevych · 2024-09-30T12:46:51Z

Hi, @beinghassandar1 . After what steps did these users receive that, and what options did the user enable?

beinghassandar1 · 2024-10-01T07:19:48Z

Hey, When user logins and we initialize the sdk, we see a crash from there users.
Its not even 1% now. Its more than that. I saw 450+ crashes for 116 users. All are for the same reason. The json is not valid.

Also, I got a new crash log.

ourserver_url = the url of our own hosting server

    Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object '{', but had 'r' instead at path: $
JSON input: relay failed to <ourserver_url>:3100
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:24)
       at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:32)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail(AbstractJsonLexer.kt:598)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$default(AbstractJsonLexer.kt:596)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json(AbstractJsonLexer.kt:233)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$kotlinx_serialization_json$default(AbstractJsonLexer.kt:228)
       at kotlinx.serialization.json.internal.AbstractJsonLexer.unexpectedToken(AbstractJsonLexer.kt:225)
       at kotlinx.serialization.json.internal.StringJsonLexer.consumeNextToken(StringJsonLexer.kt:74)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.beginStructure(StreamingJsonDecoder.kt:102)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at com.sdk.growthbook.features.FeaturesDataModel$$serializer.deserialize(FeaturesDataModel.kt:10)
       at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
       at kotlinx.serialization.json.Json.decodeFromString(Json.kt:107)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:42)
       at com.sdk.growthbook.features.FeaturesDataSource$fetchFeatures$1.invoke(FeaturesDataSource.kt:40)
       at com.sdk.growthbook.network.GBNetworkDispatcherOkHttp$consumeGETRequest$1$1.onResponse(GBNetworkDispatcherOkHttp.kt:61)
       at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
       at java.lang.Thread.run(Thread.java:1012)

vazarkevych · 2024-10-03T09:10:14Z

Hi, @beinghassandar1. Thank you for information, we will check that.

vazarkevych pushed a commit that referenced this issue Nov 9, 2024

Issue #142

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Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object #142

Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object #142

beinghassandar1 commented Sep 20, 2024 •

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madhuchavva commented Sep 20, 2024

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vazarkevych commented Sep 23, 2024

beinghassandar1 commented Sep 23, 2024

vazarkevych commented Sep 23, 2024

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beinghassandar1 commented Sep 23, 2024

beinghassandar1 commented Sep 25, 2024

madhuchavva commented Sep 26, 2024

vazarkevych commented Sep 30, 2024

beinghassandar1 commented Oct 1, 2024 •

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vazarkevych commented Oct 3, 2024

Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object #142

Fatal Exception: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 0: Expected start of the object #142

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