Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0)

Question

When I use implementation \'com.google.firebase:firebase-inappmessaging-display:17.2.0\' in my app/build.gradle, I get this error:

Answer 1

I just came across this when building my Flutter project. Not quite sure why it reared its ugly head, but here I am.

So, if any Flutter devs come across this, @Ray Li's answer worked for me. The build.gradle file that you want to edit is the one in the android/app folder (ie. NOT the one in the android folder).

Just add the implementation 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava' to the dependencies section at the end of the file, as follows:

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
}