buildSrc/src/main/java/com/uber/okbuck/core/manager/DependencyManager.java [227:271]:
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  private void validateDependencies(
      Map<VersionlessDependency, Collection<OExternalDependency>> dependencyMap) {
    if (externalDependenciesExtension.versionlessEnabled()) {
      Joiner.MapJoiner mapJoiner = Joiner.on(",\n").withKeyValueSeparator("=");

      Map<String, Set<String>> extraDependencies =
          dependencyMap
              .entrySet()
              .stream()
              .filter(entry -> entry.getValue().size() > 1)
              .filter(entry -> !externalDependenciesExtension.isVersioned(entry.getKey()))
              .map(Map.Entry::getValue)
              .flatMap(Collection::stream)
              .collect(
                  Collectors.groupingBy(
                      dependency -> dependency.getVersionless().mavenCoords(),
                      Collectors.mapping(OExternalDependency::getVersion, Collectors.toSet())));

      if (extraDependencies.size() > 0) {
        throw new IllegalStateException(
            "Multiple versions found for external dependencies: \n"
                + mapJoiner.join(extraDependencies));
      }

      Map<String, Set<String>> singleDependencies =
          dependencyMap
              .values()
              .stream()
              .filter(externalDependencies -> externalDependencies.size() == 1)
              .flatMap(Collection::stream)
              .filter(
                  dependency ->
                      externalDependenciesExtension.isVersioned(dependency.getVersionless()))
              .collect(
                  Collectors.groupingBy(
                      dependency -> dependency.getVersionless().mavenCoords(),
                      Collectors.mapping(OExternalDependency::getVersion, Collectors.toSet())));

      if (singleDependencies.size() > 0) {
        throw new IllegalStateException(
            "Single version found for external dependencies, please remove them from external dependency extension: \n"
                + mapJoiner.join(singleDependencies));
      }
    }
  }
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plugin/src/main/java/com/uber/okbuck/core/manager/DependencyManager.java [227:271]:
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  private void validateDependencies(
      Map<VersionlessDependency, Collection<OExternalDependency>> dependencyMap) {
    if (externalDependenciesExtension.versionlessEnabled()) {
      Joiner.MapJoiner mapJoiner = Joiner.on(",\n").withKeyValueSeparator("=");

      Map<String, Set<String>> extraDependencies =
          dependencyMap
              .entrySet()
              .stream()
              .filter(entry -> entry.getValue().size() > 1)
              .filter(entry -> !externalDependenciesExtension.isVersioned(entry.getKey()))
              .map(Map.Entry::getValue)
              .flatMap(Collection::stream)
              .collect(
                  Collectors.groupingBy(
                      dependency -> dependency.getVersionless().mavenCoords(),
                      Collectors.mapping(OExternalDependency::getVersion, Collectors.toSet())));

      if (extraDependencies.size() > 0) {
        throw new IllegalStateException(
            "Multiple versions found for external dependencies: \n"
                + mapJoiner.join(extraDependencies));
      }

      Map<String, Set<String>> singleDependencies =
          dependencyMap
              .values()
              .stream()
              .filter(externalDependencies -> externalDependencies.size() == 1)
              .flatMap(Collection::stream)
              .filter(
                  dependency ->
                      externalDependenciesExtension.isVersioned(dependency.getVersionless()))
              .collect(
                  Collectors.groupingBy(
                      dependency -> dependency.getVersionless().mavenCoords(),
                      Collectors.mapping(OExternalDependency::getVersion, Collectors.toSet())));

      if (singleDependencies.size() > 0) {
        throw new IllegalStateException(
            "Single version found for external dependencies, please remove them from external dependency extension: \n"
                + mapJoiner.join(singleDependencies));
      }
    }
  }
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