assertThrows(NoSuchElementException.class, () -> assertNull(navigableMap.lastKey()));
  }

  @CollectionSize.Require(ONE)
  public void testSingletonMapFirst() {
    assertEquals(a.getKey(), navigableMap.firstKey());
  }

  @CollectionSize.Require(ONE)
  public void testSingletonMapLast() {
    assertEquals(a.getKey(), navigableMap.lastKey());
  }

  @CollectionSize.Require(SEVERAL)
  public void testFirst() {

    #                                                                             Lasta Di
    #                                                                             ========
    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o dbfluteDiXmlNamespace: (NotRequired - Default 'dbflute')
    #  The namespace of DBFlute DI configuration for Lasta Di.
    #
    # @LastaDiOnly
    #; dbfluteDiXmlNamespace = dbflute

    return navigableKeySet();
  }

  @Override
  public @Nullable Entry<K, V> lastEntry() {
    return delegate.lastEntry();
  }

  @Override
  public K lastKey() {
    return delegate.lastKey();
  }

  @Override
  public @Nullable Entry<K, V> lowerEntry(K key) {
    return delegate.lowerEntry(checkValid(key));
  }

  @Override
  public @Nullable K lowerKey(K key) {

<a href="fess-crawler-es/" title="fess-crawler-es/">fess-crawler-es/</a>                                                 -         -      
<a href="fess-crawler-lasta/" title="fess-crawler-lasta/">fess-crawler-lasta/</a>                                              -         -      
<a href="fess-crawler-parent/" title="fess-crawler-parent/">fess-crawler-parent/</a>                                             -         -      

- [Deutsch (German)](docs/de/README.md)
- [한국어 (Korean)](docs/ko/README.md)

## Powered By

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): DI Container
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute"): Web Framework
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job"): Job Scheduler
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler"): Web Crawler

Nous accueillons les pull requests pour votre langue.

## Alimenté par

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di") : Conteneur DI
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute") : Framework Web
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job") : Planificateur de tâches
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler") : Crawler Web

Aceitamos pull requests para o seu idioma.

## Desenvolvido por

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): Contêiner DI
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute"): Framework Web
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job"): Agendador de Tarefas
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler"): Rastreador Web

Wir begrüßen Pull-Requests für Ihre Sprache.

## Unterstützt von

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): DI-Container
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute"): Web-Framework
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job"): Job-Scheduler
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler"): Web-Crawler

我们欢迎您的语言的 Pull Request。

## 技术支持

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): DI 容器
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute"): Web 框架
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job"): 任务调度器
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler"): Web 爬虫

귀하의 언어로 된 풀 리퀘스트를 환영합니다.

## 제공된 기술

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): DI 컨테이너
* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute"): 웹 프레임워크
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job"): 작업 스케줄러
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler"): 웹 크롤러