Getting error java.lang.NoClassDefFoundError: Failed resolution of: Lorg/slf4j/LoggerFactory; at io.getunleash.UnleashClient.<clinit>(UnleashClient.kt:82)

[daniel-waiguru]

Describe the bug

I am getting this error on release build java.lang.NoClassDefFoundError: Failed resolution of: Lorg/slf4j/LoggerFactory; at io.getunleash.UnleashClient.(UnleashClient.kt:82) while trying to instantiate unleash client

Steps to reproduce the bug

1. Add unleash dependency
2. Add proguard rules
3. Create unleash client on app startup
4. Launch release build app
5. App crashes with the error above issue seem to be Logger used in UnleashClient

Expected behavior

Unleash client should be created with app crash

Logs, error output, etc.

java.lang.NoClassDefFoundError: Failed resolution of: Lorg/slf4j/LoggerFactory;
                                                                                                    at io.getunleash.UnleashClient.<clinit>(UnleashClient.kt:82)

Screenshots

No response

Additional context

No response

Unleash version

1.0.0

Subscription type

Enterprise

Hosting type

Hosted by Unleash

SDK information (language and version)

Mobile SDK version 1.0.0

[chriswk]

Hi I think you need to add org.slf4j.* to your proguard inclusion rules. We're working on a new version of the Android SDK which should fix most of these issues (Use logging from the android skeleton).

[daniel-waiguru]

This doesn't seem to solve the issue, is this logger library opensource? I would like to see their proguard rules

[gastonfournier]

We've launched a new SDK https://github.com/Unleash/unleash-android which does not use SLF4J and leans on native Android logging.

This is a migration guide: https://github.com/Unleash/unleash-android/blob/main/docs/MigrationGuide.md