Downgrade to Guava 11.0.2

    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <!-- We support versions as old as 11.0.2 (the version used by                                                                                                                                                                                                                                                                                                        
           Hadoop) but prefer more recent versions. -->
      <version>11.0.2</version>
    </dependency>