Cannot access class 'com.google.common.util.concurrent.ListenableFuture'. Check your module classpath for missing or conflicting dependencies

[mueller-ma]

[REQUIRED] Issue description

I'm using work manager 2.4.0 and exoplayer 2.11.8 in an app: https://github.com/openhab/openhab-android/blob/master/mobile/build.gradle
When I want to bump the exoplayer version to 2.12.0 the build fails: Cannot access class 'com.google.common.util.concurrent.ListenableFuture'. Check your module classpath for missing or conflicting dependencies at WorkManager#getWorkInfosForUniqueWork().

[REQUIRED] Reproduction steps

Bump version from 2.11.8 to 2.12.0

[REQUIRED] Link to test content

openhab/openhab-android#2204

[REQUIRED] A full bug report captured from the device

This is a build issue

[REQUIRED] Version of ExoPlayer being used

2.12.0

[REQUIRED] Device(s) and version(s) of Android being used

This is a build issue

[icbaker]

Ah sorry for this - there's a bit more detail about what's going on here in a blog by Gradle: https://blog.gradle.org/guava

There are a couple of options for you to fix this:

1. Add a dep from your module on Guava (this is how we resolved the same error in the exo-workmanager extension: 1f12542)
2. Use the missing-metadata-guava Gradle plugin described in the blog in your module.

The 3rd option is for ExoPlayer to export Guava as an api dependency from all our modules, but we don't really want to do this (see 'benefits' of implementation deps: https://docs.gradle.org/current/userguide/java_library_plugin.html#sec:java_library_separation).

[mueller-ma]

I added the plugin from the blog post to the app. Thanks for this hint.