NoClassDefFoundError on Android 5 and 6 after upgrading to v2

[guillaume-tgl]

After upgrading TelemetryDeck to v2.x, I started getting crashes on Android 5 and 6 devices with the following stacktrace:

java.lang.NoClassDefFoundError: io.ktor.util.collections.ConcurrentMap$$ExternalSyntheticLambda0
         at io.ktor.util.collections.ConcurrentMap.computeIfAbsent(ConcurrentMapJvm.kt:19)
         at io.ktor.client.engine.cio.CIOEngine.selectEndpoint(CIOEngine.kt:118)
         at io.ktor.client.engine.cio.CIOEngine.execute(CIOEngine.kt:76)
         at io.ktor.client.engine.HttpClientEngine$executeWithinCallContext$2.invokeSuspend(HttpClientEngine.kt:99)
         at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)

It looks like this is due to the upgrade to Ktor CIO v2, which requires Java desugaring for Android 6 and before: https://ktor.io/docs/client-engines.html#minimal-version

An explanation on how to configure desugaring should be added to the README.
One solution to avoid using desugaring would be to use OkHttp instead of CIO, as it's compatible with Android 5+.

[kkostov]

Hi @guillaume-tgl, that's a very good catch! I created a PR that switches over to OkHttp to make it easier to use on Android 5 and 6 targets.