* the {@code Cache} user, only logged via a {@link Logger}.
   *
   * @return the cache builder reference that should be used instead of {@code this} for any
   *     remaining configuration and cache building
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalStateException if a removal listener was already set
   */

   * the {@code Cache} user, only logged via a {@link Logger}.
   *
   * @return the cache builder reference that should be used instead of {@code this} for any
   *     remaining configuration and cache building
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalStateException if a removal listener was already set
   */