Cwa-app-android: ClassNotFoundException ExposureSummary on microG since 1.9.1

[Diapolo]

Technical details

• Device name: Fairphone 2
• Android version: Android 10 / LineageOS for microG (lineage-17.1-20201203-microG-FP2.zip)
• App version: 1.9.1
• ENF version: 204713000
• microG version: v0.2.15.204713

Describe the bug

I initially got the error URSACHE: 9002 - ClassNotFoundException today after upgrading from 1.7.1 to 1.9.1 right after opening CWA the first time during Prüfung läuft.... I didn't bother, but saw that my last update state in the app was stuck at yesterday 16:24 or something.

Today I tried to reset the app and got the same error at the same step Prüfung läuft.... After a few minutes I get the expected screen after a reset.

Detailed screenshots

Steps to reproduce the issue

1. Reset the app and activate Risikoermittlung
2. Daten werden herungergeladen... is working
3. Error shows up in the Prüfung läuft... step

Additional information

Exposure notification details (microG) is showing me that I got key updates right after resetting.
Also see: microg/GmsCore#1325

Expected behaviour

A working app like I had with 1.7.1 ;).

[thomasaugsten]

Please open an issue in the microG repo it looks like the implementation is missing an Class

[Diapolo]

This was fixed by https://github.com/microg/GmsCore/commit/714367b3aa6aa3bcc8b7bd087a9ff01d53f5476a.

[nidico]

I can confirm this issue does not occur with CWA 1.9.1 on microg GmsCore v0.2.16.204713 (released today).