ThreadDumpParser emits module `null.<Class>` for default-package classes, breaking ProGuard symbolication of ANR events

[eygraber]

Integration

sentry-android

Build System

Gradle

AGP Version

9.3.1

Proguard

Enabled

Other Error Monitoring Solution

Firebase Crashlytics

Version

8.53.0

Steps to Reproduce

1. Build a release app minified by R8 with default settings, so most classes are repackaged into the default (root) package (e.g. class sf2 with no package).
2. Upload the ProGuard mapping; confirm the event association works (the event's debug_meta contains the mapping's proguard UUID).
3. Enable ANR reporting via AnrV2Integration (AppExitInfo).
4. Trigger an ANR so the OS records a thread dump, then relaunch the app so the SDK parses the dump and sends the ANR event.

Expected Result

Frames for default-package classes carry module = "sf2", matching the mapping's key, so server-side ProGuard symbolication deobfuscates them.

Actual Result

Frames carry the literal string module = "null.sf2", symbolication looks up null.sf2 in a mapping keyed by sf2, misses, and every app frame in the event stays obfuscated even though the correct mapping is uploaded and referenced. Culprits render as e.g. null.mz3 in K.

[linear-code]

JAVA-696