Utility Gradle task to find where duplicate classes come from (for Gradle 4.1+)

find_in_dependencies.gradle

// H/t to https://github.com/ethankhall/scripts/blob/master/gradle/find-file.gradle for the idea;
// this re-written version actually works in modern Gradle and Android Gradle plugins.

task findInDependencies {
  doLast {
    println()

    def resolvableConfigs = project.getConfigurations()
        .stream()
        .filter { it.isCanBeResolved() }

    resolvableConfigs.each { config ->
      config.resolve()
          .stream()
          .filter {
        //noinspection GroovyPointlessBoolean
        zipTree(it)
            .filter { it.name.startsWith 'Nonnegative' }        // TODO replace `Nonnegative` with what you are looking for
            .each { println "    Match: $it.path" }
            .toList()
            .isEmpty() == false
      }
      .each {
        println "Found in `$config.name: $it.name`\n"
      }
    }
  }
}

Thanks, I have incorporated it in the main gist