Exponea not initialized because of missing Gson Proguard/R8 rules

[LudoFarkas]

Hi.

After enabling R8 full mode with the update of our development tools, Exponea does not initialize on start of our release app. This is due to missing Gson Proguard/R8 rules. See log:

Exponea Safe Mode wrapper caught unhandled error java.lang.ExceptionInInitializerError at com.exponea.sdk.ExponeaComponent.(SourceFile:62) at com.exponea.sdk.Exponea.initializeSdk(SourceFile:10) at com.exponea.sdk.Exponea.init(SourceFile:18) at xg.c.invokeSuspend(SourceFile:157) at xg.c.invoke(SourceFile:11) at rh.n.invokeSuspend(SourceFile:47) at rh.n.invoke(SourceFile:13) at kotlinx.coroutines.flow.j.c(SourceFile:81) at lf.l.invokeSuspend(SourceFile:47) at lf.l.invoke(SourceFile:13) at ys.c.h0(SourceFile:5) at nb.r0.A(SourceFile:10) at lf.m.i(SourceFile:7) at lf.g.a(SourceFile:6) at lf.d.invokeSuspend(SourceFile:33) at ve.a.resumeWith(SourceFile:9) at kotlinx.coroutines.k0.run(SourceFile:109) at kotlinx.coroutines.internal.e.run(SourceFile:12) at kotlinx.coroutines.scheduling.k.run(SourceFile:3) at kotlinx.coroutines.scheduling.b.run(SourceFile:80) Caused by: java.lang.RuntimeException: Missing type parameter. at com.google.gson.reflect.a.getSuperclassTypeParameter(SourceFile:27) at com.google.gson.reflect.a.(SourceFile:2)

We do not use Gson in our app, thus have no rules configured. Since the rules are transient, we believe they should be configured within Exponea.

This is our temporary fix:

-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken -keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

Exponea version: 3.6.1

[adam1929]

Thank you @LudoFarkas for reporting. Proguard rules can be applied only on application side. As I investigate this, GSON provides some changes due to R8 recently, maybe it will fix somethings. Thank you