Examples of java.util.ConcurrentModificationException

java.util.ConcurrentModificationException
This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
For example, it is not generally permissible for one thread to modify a Collection while another thread is iterating over it. In general, the results of the iteration are undefined under these circumstances. Some Iterator implementations (including those of all the general purpose collection implementations provided by the JRE) may choose to throw this exception if this behavior is detected. Iterators that do this are known as fail-fast iterators, as they fail quickly and cleanly, rather that risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that this exception does not always indicate that an object has been concurrently modified by a different thread. If a single thread issues a sequence of method invocations that violates the contract of an object, the object may throw this exception. For example, if a thread modifies a collection directly while it is iterating over the collection with a fail-fast iterator, the iterator will throw this exception.
Note that fail-fast behavior cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast operations throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: ConcurrentModificationException should be used only to detect bugs. @author Josh Bloch @version 1.20, 03/30/06 @see Collection @see Iterator @see ListIterator @see Vector @see LinkedList @see HashSet @see Hashtable @see TreeMap @see AbstractList @since 1.2

                throw new ClassCastException(
                    "Attempted to use an invalid value type " +
                    " with a map with values of type " + valueType.getName());
            }
            if (keys.length != values.length) {
                throw new ConcurrentModificationException();
            }
            for (int i=0; i<keys.length; i++) {
                map.put(keys[i], values[i]);
            }
        }

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  public void execute(HgStatusHandler statusHandler) throws HgCallbackTargetException, HgException, IOException, CancelledException {
    if (statusHandler == null) {
      throw new IllegalArgumentException();
    }
    if (mediator.busy()) {
      throw new ConcurrentModificationException();
    }
    HgStatusCollector sc = new HgStatusCollector(repo); // TODO from CommandContext
//    PathPool pathHelper = new PathPool(repo.getPathHelper()); // TODO from CommandContext
    try {
      // XXX if I need a rough estimation (for ProgressMonitor) of number of work units,

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  public void execute(HgChangesetHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
    if (handler == null) {
      throw new IllegalArgumentException();
    }
    if (csetTransform != null) {
      throw new ConcurrentModificationException();
    }
    final ProgressSupport progressHelper = getProgressSupport(handler);
    try {
      if (repo.getChangelog().getRevisionCount() == 0) {
        return;

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  public void execute(final HgChangesetTreeHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
    if (handler == null) {
      throw new IllegalArgumentException();
    }
    if (csetTransform != null) {
      throw new ConcurrentModificationException();
    }
    if (file == null) {
      throw new IllegalArgumentException("History tree is supported for files only (at least now), please specify file");
    }
    final int firstCset = startRev;

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  public void execute(HgManifestHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
    if (handler == null) {
      throw new IllegalArgumentException();
    }
    if (visitor != null) {
      throw new ConcurrentModificationException();
    }
    try {
      visitor = handler;
      mediator.start(getCancelSupport(handler, true));
      repo.getManifest().walk(startRev, endRev, mediator);

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            Element<E> element = null;
            try {
                element = nextElement.get();
            } catch (ObjectNotFoundException onfe) {
                throw new ConcurrentModificationException(
                        "next element was removed from the deque: " + 
                        nextElement);
            }


            currentRemoved = false;

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    if (n >= hitDocs.size()) {
      getMoreDocs(n);
    }


    if (n >= length) {
      throw new ConcurrentModificationException("Not a valid hit number: " + n);
    }
    
    return (HitDoc) hitDocs.elementAt(n);
  }

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         * @exception NoSuchElementException if there is no element left in the map
         */
        public int key()
            throws ConcurrentModificationException, NoSuchElementException {
            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }
            if (current < 0) {
                throw new NoSuchElementException();
            }
            return keys[current];

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         * @exception NoSuchElementException if there is no element left in the map
         */
        public double value()
            throws ConcurrentModificationException, NoSuchElementException {
            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }
            if (current < 0) {
                throw new NoSuchElementException();
            }
            return values[current];

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         */
        public void advance()
            throws ConcurrentModificationException, NoSuchElementException {


            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }


            // advance on step
            current = next;

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