code: @Beta
    @GwtIncompatible("To be supported")
    public static CacheBuilder<Object, Object> from(String spec) {
      return from(CacheBuilderSpec.parse(spec));
    }
docs: Constructs a new {@code CacheBuilder} instance with the settings specified in {@code spec}.
  This is especially useful for command-line configuration of a {@code CacheBuilder}.
  
  @param spec a String in the format specified by {@link CacheBuilderSpec}
  @since 12.0