* @param columnKey column key that the value should be associated with
   * @param value value to be associated with the specified keys
   * @return the value previously associated with the keys, or {@code null} if no mapping existed
   *     for the keys
   */
  @CanIgnoreReturnValue
  @Nullable V put(
      @ParametricNullness R rowKey, @ParametricNullness C columnKey, @ParametricNullness V value);

  /**

   * @param columnKey column key that the value should be associated with
   * @param value value to be associated with the specified keys
   * @return the value previously associated with the keys, or {@code null} if no mapping existed
   *     for the keys
   */
  @CanIgnoreReturnValue
  @Nullable V put(
      @ParametricNullness R rowKey, @ParametricNullness C columnKey, @ParametricNullness V value);

  /**

            // We extract multi release jar classes ( if these exist ) going from 9 - the first to support them, to the
            // current `targetCompatibility` version.
            // Each extract will overwrite the top level classes that existed before it, the result is that we end up
            // with a single version of the class in `jarExpandDir`.

        try {
            String result = SystemUtil.getSearchEngineHttpAddress();
            assertNull(result);
        } finally {
            // Restore original value if it existed
            if (originalValue != null) {
                System.setProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS, originalValue);
            }
        }
    }

    @Test

        for (final UrlQueue<String> urlQueue : urlQueueList) {
            if (!exists(sessionId, urlQueue.getUrl()) && !dataService.exists(sessionId, urlQueue.getUrl())) {
                urlQueue.setSessionId(sessionId);
                targetList.add(urlQueue);
            } else if (logger.isDebugEnabled()) {
                logger.debug("Existed URL: Session ID: {}, UrlQueue: {}", sessionId, urlQueue);
            }
        }

			}

			if typ&os.ModeDir != 0 {
				h := hashPath(entName)
				_, exists := f.oldCache.Cache[h.Key()]
				if h == thisHash {
					return nil
				}
				this := cachedFolder{name: entName, parent: &thisHash, objectHealProbDiv: folder.objectHealProbDiv}
				delete(abandonedChildren, h.Key()) // h.Key() already accounted for.
				if exists {
					existingFolders = append(existingFolders, this)

	Prefix  string    `msg:"pr,omitempty"` // Prefix as given by request.
	File    string    `msg:"fl"`           // File name as given in request.
	Exists  bool      `msg:"ex"`           // Returns whether the file existed on disk.
	Error   string    `msg:"er,omitempty"` // Returns any error when reading.
	Data    []byte    `msg:"d"`            // Contains all data of file.

   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon
   * construction of the iterator, and may (but is not guaranteed to) reflect any modifications
   * subsequent to construction.
   *
   * @return an iterator over the elements in this queue in proper sequence
   */

   * in any particular order. The returned {@code Iterator} is a "weakly consistent" iterator that
   * will never throw {@link ConcurrentModificationException}, and guarantees to traverse elements
   * as they existed upon construction of the iterator, and may (but is not guaranteed to) reflect
   * any modifications subsequent to construction.
   *
   * @return an iterator over the elements in this queue
   */

   * Iterator} is a "weakly consistent" iterator that will never throw {@link
   * ConcurrentModificationException}, and guarantees to traverse elements as they existed upon
   * construction of the iterator, and may (but is not guaranteed to) reflect any modifications
   * subsequent to construction.
   *
   * @return an iterator over the elements in this queue in proper sequence
   */