Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in .../build/app/outputs/mapping/.../.txt.

Hi Adnan Ayoub,
Please check the below answer Which has clear detail provided by Michele Ariis. It may be helpful.
-Open the R8 report.

You can find it at: app/build/outputs/mapping/<flavorRelease>/missing_rules.txt.

Inside, you’ll see a detailed list of missing classes or suggested -keep / -dontwarn rules.

Fix the issue using one (ideally both) of these methods:

Add the missing libraries in your build.gradle file (e.g., Conscrypt, SLF4J, etc.).

Copy the recommended rules from the report into your proguard-rules.pro (or consumer-rules.pro if you're publishing a library).

Then, rebuild the project using ./gradlew clean assembleRelease or your Azure DevOps pipeline.

If new missing classes are detected, the report will be regenerated. Repeat this process until the build passes.

Avoid shortcuts.

Options like -ignorewarnings or android.r8.failOnMissingClasses=false only work with AGP ≤ 7.x and reduce security.

if you have any further concerns or queries, please feel free to reach out to us.

@Alekhya Vaddepally Thanks, we follow the same step, still APK size becomes too large and App crashes while using the ACS.

*com.bea.xml.stream.MXParserFactory not found
*

Hi Adnan Ayoub
The issue you are facing - the Provider com.bea.xml.stream.MXParserFactory not found - the way Azure Communication Services (ACS) SDK XML handles XML parsing internal handle, especially related using Stax (Streaming API for XML). This framework depends on a parser implementation, which is present on the runtime, usually loaded using Java's services Loder mechanisms.

In the build released with R8 enabled (isminifyenabled = True and isshrinkresources = True, some essential classes are removed during code shrinking and adaptation - even if they are used indirectly (through reflection or conferencing files).

Include the required parser dependence Add the following to your build.gradle to provide the required XML Parser

implementation 'org.glassfish:beaxml:1.2.0'

This ensures the com.bea.xml.stream.MXParserFactory class is available at runtime, which the ACS SDK expects.

Update your proguard-rules.pro with the following rules to prevent R8 from removing the required classes and configurations

# Keep the required parser class
-keep class com.bea.xml.stream.MXParserFactory { *; }
# Retain ServiceLoader metadata used by XMLInputFactory
-keepresourcexmlelements META-INF/services/*

After implementing these changes, do using a clean build

./gradlew clean assembleRelease

Then verify the release builds to ensure stability and functionality of ACS components (chat, calling, etc.).

If you are watching an increase in APK size after adding parser dependence:

Continue using isShrinkResources and isminifyenabled (already configured correctly).

Analysis APK using Android Studio> Build> analyze APK to pinpoint and trim unused resources.

Consider using Android App Bundles (AAB) or on-demand module when ACS functionality is optional.

Hi Adnan Ayoub
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.