assertThat(longAdder.sum()).isEqualTo(Long.MAX_VALUE);
    longAdder.add(1);
    // silently overflows; is this a bug?
    // See https://github.com/google/guava/issues/3503
    assertThat(longAdder.sum()).isEqualTo(-9223372036854775808L);
  }

    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer depth;

    /**
     * Maximum number of pages/documents to access during crawling.
     */
    @Min(value = 0)
    @Max(value = 9223372036854775807L)
    @ValidateTypeFailure
    public Long maxAccessCount;

    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer depth;

    /** The maximum number of documents to access during crawling (0 means unlimited). */
    @Min(value = 0)
    @Max(value = 9223372036854775807L)
    @ValidateTypeFailure
    public Long maxAccessCount;

    /** The number of threads to use for crawling (required, 1 to 2147483647). */
    @Required
    @Min(value = 1)
    @Max(value = 2147483647)

    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer depth;

    /**
     * The maximum number of URLs to access during crawling.
     */
    @Min(value = 0)
    @Max(value = 9223372036854775807L)
    @ValidateTypeFailure
    public Long maxAccessCount;

    /**
     * The user agent string to use during crawling.
     */
    @Required
    @Size(max = 200)
    public String userAgent;