gradle exclude group from compile

Question

I am getting this duplicate error when building my app:

addJar(...facebookadapter-4.0.3.jar): entry
duplicate entry: com/facebook/ads/AbstractAdListener.class

The reason I am getting this is that my app compiles Facebook modules one belongs to an adapter and one to its original SDK:

compile ('com.ironsource.adapters:facebookadapter:4.0.3@jar') compile 'com.facebook.android:audience-network-sdk:4.27.0' compile 'com.google.ads.mediation:facebook:4.27.0.0'

So as a solution, I am trying to exclude this group from the module which contains the adapter jar compile statement:

compile ('com.ironsource.adapters:facebookadapter:4.0.3@jar') {
    exclude (group: 'com/facebook/ads')
}

But, when I build my app again it fails to state the same reason from the same adapter

Any idea why the classes are not being excluded?

Solution

Looks like the exclude block syntax is incorrect. Try

compile ('com.ironsource.adapters:facebookadapter:4.0.3@jar') {
  exclude group: 'com.facebook.ads'
}

Update

So it looks like the facebookadapter contains this class inside. You can not exclude a class from a jar file, exclusion only works on per-dependency level.

If you absolutely need to have this adapter, you can try to exclude facebook ads transitive dependency from all the other dependencies.

configurations {
    all*.exclude group: 'com.facebook.ads'
}

Comments

[Nikita Skvortsov]

use gradlew :app:dependencyInsight --configuration compile --dependency com.facebook.ads to check where the dependency comes from

[Michael A]

That was my first try, both syntaxes give the same result

[Nikita Skvortsov]

oh, so the class is inside the jar. That makes problem tricker, please see my update

[Michael A]

Thanks, can you please elaborate on this line "You can not exclude a class from a jar file, exclusion only works on per-dependency level"

[Nikita Skvortsov]

Each dependecy declaration in Gradle defines a subtree:not only the actual library (a single jar file), but all the dependencies of this library as well (transitive dependencies, multiple jar files). The exclude directive allows you to exclude some of transitive dependencies (exclude several jar files). In case of com.ironsource.adapters:facebookadapter:4.0.3@jar the com/facebook/ads/AbstractAdListener.class is a part of library, not a transitive dependency, you can not exclude it this way