synchronized (mutex) {
        Collection<V> collection = super.get(key);
        return (collection == null) ? null : typePreservingCollection(collection, mutex);
      }
    }

    @Override
    public Set<Map.Entry<K, Collection<V>>> entrySet() {
      synchronized (mutex) {
        if (asMapEntrySet == null) {
          asMapEntrySet = new SynchronizedAsMapEntries<>(delegate().entrySet(), mutex);
        }

    waiter1.join();
    waiter2.awaitWaiting(); // should still be blocked

    LockSupport.unpark(waiter2); // spurious wakeup
    waiter2.awaitWaiting(); // should eventually re-park

    future.set(null);
    waiter2.join();
  }

  public void testRemoveWaiter_polling() throws Exception {
    final AbstractFuture<String> future = new AbstractFuture<String>() {};
    WaiterThread waiter = new WaiterThread(future);

            if (uploadFile == null) {
                throwValidationError(messages -> messages.addErrorsDesignFileNameIsNotFound("designFileName"), this::asListHtml);
                return null;
            }
        } else {
            throwValidationError(messages -> messages.addErrorsDesignFileIsUnsupportedType("designFileName"), this::asListHtml);
            return null;
        }

    for (Listener listener : listeners) {
      listener.execute();
    }
    listeners = null;
  }

  protected void afterDone() {}

  @Override
  protected final Throwable tryInternalFastPathGetFailure() {
    if (this instanceof Trusted) {
      return state == State.FAILURE ? throwable : null;
    }
    return null;
  }

  final void maybePropagateCancellationTo(@Nullable Future<?> related) {

                List<@Nullable String> list = newArrayList();
                for (String element : elements) {
                  list.add((element == null) ? null : "q" + element);
                }
                return Collections2.transform(
                    list, from -> isNullOrEmpty(from) ? null : from.substring(1));
              }
            })
        .named("Collections2.transform")
        .withFeatures(

     *            be <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void injectManagement(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

     *            <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void injectManagement(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

            return null
        }

        if (!changed(member)) {
            return null
        }

        Optional<CtClass> oldClass = member.oldClass
        Optional<CtClass> newClass = member.newClass
        if (!oldClass.isPresent() || !newClass.isPresent()) {
            // breaking change would be reported
            return null
        }

 */
public class ClickLogBhv extends BsClickLogBhv {
    private static final Logger logger = LogManager.getLogger(ClickLogBhv.class);

    private String indexName = null;

    @Override
    protected String asEsIndex() {
        if (indexName == null) {
            final String name = ComponentUtil.getFessConfig().getIndexLogIndex();
            indexName = super.asEsIndex().replaceFirst(Pattern.quote("fess_log"), name);
        }

        builder.startObject();
        if (sessionId != null) {
            builder.field(SESSION_ID, sessionId);
        }
        if (filterType != null) {
            builder.field(FILTER_TYPE, filterType);
        }
        if (url != null) {
            builder.field(URL, url);
        }
        builder.endObject();
        return builder;
    }