Fatal Exception: java.lang.RuntimeException java.lang.Throwable: A WebView method was called on thread 'mqt_native_modules'.

[Bej-Technologies]

I am getting the following error from AppNexus:

Fatal Exception: java.lang.RuntimeException
java.lang.Throwable: A WebView method was called on thread 'mqt_native_modules'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {94ff67b} called on Looper (mqt_native_modules, tid 197) {3c0cc80}, FYI main Looper is Looper (main, tid 2) {94ff67b})

It happens when the user backgrounds the app. We have AppNexus implemented as a Native Module in React Native and I believe there is some request in AppNexus that gets run when the app is backgrounded on a thread that it's not allowed to which causes the crash. I am having a hard time finding the source of the issue though, what we use is MultiAdRequestListener to fetch the ads. Anyone has any idea of where the issue could be?

[yrajshekhar]

Hi @Bej-Technologies , Please provide following details for us to look into it .

1. Full Stacktrace
2. Appnexus SDK version that you are using.
3. Android Version

[Bej-Technologies]

Hi @yrajshekhar!

Stacktrace:

Fatal Exception: java.lang.RuntimeException: java.lang.Throwable: A WebView method was called on thread 'mqt_native_modules'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {4bbf924} called on Looper (mqt_native_modules, tid 263) {5da52b}, FYI main Looper is Looper (main, tid 2) {4bbf924})
       at android.webkit.WebView.checkThread(WebView.java:2615)
       at android.webkit.WebView.loadUrl(WebView.java:742)
       at com.iab.omid.library.appnexus.b.e.a(:30)
       at com.iab.omid.library.appnexus.b.e.a(:30)
       at com.iab.omid.library.appnexus.b.e.a(:12)
       at com.iab.omid.library.appnexus.publisher.AdSessionStatePublisher.a(:8)
       at com.iab.omid.library.appnexus.b.f.a(:30)
       at com.iab.omid.library.appnexus.a.d.d(:4)
       at com.iab.omid.library.appnexus.a.d.onChange(:15)
       at android.database.ContentObserver.onChange(ContentObserver.java:153)
       at android.database.ContentObserver.onChange(ContentObserver.java:169)
       at android.database.ContentObserver.onChange(ContentObserver.java:187)
       at android.database.ContentObserver.onChange(ContentObserver.java:202)
       at android.database.ContentObserver.lambda$dispatchChange$0$ContentObserver(ContentObserver.java:282)
       at android.database.ContentObserver$$ExternalSyntheticLambda0.run(:10)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run(MessageQueueThreadImpl.java:226)
       at java.lang.Thread.run(Thread.java:920)

AppNexus SDK version: com.appnexus.opensdk:appnexus-sdk:[7,8)

Android versions are very spread out, see attached screenshot.

[yrajshekhar]

Hi @Bej-Technologies, We are unable to replicate on our end. Please share the replication steps along with sample application to replicate the issue.

[Bej-Technologies]

@yrajshekhar I managed to reproduce it now, it crashes when I press the volume up/down button. Any ideas why that can be?

[Bej-Technologies]

I'm also trying to fork the library to edit it myself but the build seems to fail? https://jitpack.io/com/github/appnexus/mobile-sdk-android/7.21/build.log

[Bej-Technologies]

Ping @yrajshekhar

[Bej-Technologies]

I did some downgrading to see if I could get rid of the issue with older versions of your library and it seems like on version 7.13.1 it starts working. But version 7.14 and up I experience this issue

[avohraa]

I am getting the following error from AppNexus:

Fatal Exception: java.lang.RuntimeException
java.lang.Throwable: A WebView method was called on thread 'mqt_native_modules'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {94ff67b} called on Looper (mqt_native_modules, tid 197) {3c0cc80}, FYI main Looper is Looper (main, tid 2) {94ff67b})

It happens when the user backgrounds the app. We have AppNexus implemented as a Native Module in React Native and I believe there is some request in AppNexus that gets run when the app is backgrounded on a thread that it's not allowed to which causes the crash. I am having a hard time finding the source of the issue though, what we use is MultiAdRequestListener to fetch the ads. Anyone has any idea of where the issue could be?

@Bej-Technologies Going back to initial issue raised here, could you confirm that this issue arises only for MultiAdRequest. Maybe try using just BannerAdView / NativeAdRequest and see if you are able to replicate the issue with it as well. This will help us narrow down the issue to a certain implementation.

Also, we have upgraded the OMID, can you test your implementation with the latest SDK version, and let us know if the issue is still there.

[avohraa]

@Bej-Technologies were you able to test the above-mentioned scenarios? We are waiting for your response on it, to proceed further on our investigation.

[avohraa]

We are closing this issue due to inactivity. In case the issue persists, please feel free to reach out Xandr support.