private final Map<TransferResourceIdentifier, TransferResourceAndSize> transfers = new LinkedHashMap<>();
    private final FileSizeFormat format = new FileSizeFormat(); // use in a synchronized fashion
    private final StringBuilder buffer = new StringBuilder(128); // use in a synchronized fashion

    private final boolean printResourceNames;
    private int lastLength;

    public ConsoleMavenTransferListener(

            bus.handleSubscriberException(e.getCause(), context(event));
          }
        });
  }

  /**
   * Invokes the subscriber method. This method can be overridden to make the invocation
   * synchronized.
   */
  @VisibleForTesting
  void invokeSubscriberMethod(Object event) throws InvocationTargetException {
    try {
      method.invoke(target, checkNotNull(event));
    } catch (IllegalArgumentException e) {

     *
     * @param factory The URL stream handler factory.
     */
    public static void setURLStreamHandlerFactory(
            URLStreamHandlerFactory factory) {
        synchronized (PROTOCOL_HANDLERS) {
            if (Handler.factory != null) {
                throw new IllegalStateException(
                        "URLStreamHandlerFactory already set.");
            }

   */
  public static TesterRequirements getTesterRequirements(Class<?> testerClass)
      throws ConflictingRequirementsException {
    synchronized (classTesterRequirementsCache) {
      TesterRequirements requirements = classTesterRequirementsCache.get(testerClass);
      if (requirements == null) {
        requirements = buildTesterRequirements(testerClass);

   */
  public static TesterRequirements getTesterRequirements(Class<?> testerClass)
      throws ConflictingRequirementsException {
    synchronized (classTesterRequirementsCache) {
      TesterRequirements requirements = classTesterRequirementsCache.get(testerClass);
      if (requirements == null) {
        requirements = buildTesterRequirements(testerClass);

import org.apache.logging.log4j.Logger;

public class IngestFactory {
    private static final Logger logger = LogManager.getLogger(IngestFactory.class);

    private Ingester[] ingesters = {};

    public synchronized void add(final Ingester ingester) {
        if (logger.isDebugEnabled()) {
            logger.debug("Loaded {}", ingester.getClass().getSimpleName());
        }

        final int idx = sessionId.indexOf('-');
        if (idx >= 0) {
            return sessionId.substring(0, idx);
        }
        return sessionId;
    }

    public synchronized void store(final String sessionId, final boolean create) {
        CrawlingInfo crawlingInfo = create ? null : getCrawlingInfoService().getLast(sessionId);
        if (crawlingInfo == null) {

     * 
     * @param host
     * @param tc
     * @return resolved name, null if not found
     */
    public synchronized NbtAddress getByName ( String host, CIFSContext tc ) {
        return getByName(new Name(tc.getConfig(), host, 0x20, null), tc);
    }


    synchronized NbtAddress getByName ( Name name, CIFSContext tc ) {
        NbtAddress result = null;

        try {

            throw this.e;
        }
    }


    synchronized void write ( byte[] buffer, int len, SmbFileOutputStream d ) {
        this.b = buffer;
        this.n = len;
        this.out = d;
        this.ready = false;
        notify();
    }


    @Override
    public void run () {
        synchronized ( this ) {
            try {
                for ( ;; ) {

    Multimap<K, V> multimap = synchronizedMultimap(HashMultimap.<K, V>create());
    Collection<V> values = multimap.get(key); // Needn't be in synchronized block
    synchronized (multimap) { // Synchronizing on multimap, not values!
      Iterator<V> i = values.iterator(); // Must be in synchronized block
      while (i.hasNext()) {
        foo(i.next());
      }
    }
  }

  private static void foo(Object unused) {}