Reported in https://github.com/google/guava/issues/3086#issuecomment-378523615

Needs a fix like https://github.com/google/guava/commit/8f22dbc8ea0c1abdf044846057f6df8201ee9961
}
  
  @SuppressWarnings("unchecked")
  <K1 extends K, V1 extends V> RemovalListener<K1, V1> getRemovalListener() {
    return (RemovalListener<K1, V1>)
        MoreObjects.firstNonNull(removalListener, NullListener.INSTANCE);
  }
  /**
   * Enable the accumulation of {@link CacheStats} during the operation of the cache. Without this
   * {@link Cache#stats} will return zero for all statistics. Note that recording stats requires
   * bookkeeping to be performed with each operation, and thus imposes a performance penalty on
   * cache operation.
   *
   * @return this {@code CacheBuilder} instance (for chaining)
   * @since 12.0 (previously, stats collection was automatic)
   */
  public CacheBuilder<K, V> recordStats() {
    statsCounterSupplier = CACHE_STATS_COUNTER;
    return this;
  }
  boolean isRecordingStats() {
    return statsCounterSupplier == CACHE_STATS_COUNTER;
  }
  Supplier<? extends StatsCounter> getStatsCounterSupplier() {
    return statsCounterSupplier;
  }
  /**
   * Builds a cache, which either returns an already-loaded value for a given key or atomically
   * computes or retrieves it using the supplied {@code CacheLoader}. If another thread is currently
   * loading the value for this key, simply waits for that thread to finish and returns its loaded