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

            return false;
        } else if (nextNode != null) {
            return true;
        } else {
            if (currentNode instanceof OMNode && ((OMNode)currentNode).getParent() != currentParent) {
                throw new ConcurrentModificationException("The current node has been removed using a method other than Iterator#remove()");
            }
            nextNode = getNextNode(currentNode);
            noMoreNodes = nextNode == null;
            return !noMoreNodes;
        }

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            return false;
        } else if (nextNode != null) {
            return true;
        } else {
            if (currentNode.getParent() != currentParent) {
                throw new ConcurrentModificationException("The current node has been removed using a method other than Iterator#remove()");
            }
            nextNode = getNextNode(currentNode);
            noMoreNodes = nextNode == null;
            return !noMoreNodes;
        }

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     * will leave the underlying data structure in a confused
     * state.
     */
    public void remove() {
        if ( _expectedSize != _hash.size() ) {
            throw new ConcurrentModificationException();
        }


        // Disable auto compaction during the remove. This is a workaround for bug 1642768.
        try {
            _hash.tempDisableAutoCompaction();

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     *          collection's size has been modified since the iterator was
     *          created.
     */
    protected final int nextIndex() {
        if ( _expectedSize != _hash.size() ) {
            throw new ConcurrentModificationException();
        }


        Object[] set = _object_hash._set;
        int i = _index;
        while ( i-- > 0 && ( set[i] == TObjectHash.FREE || set[i] == TObjectHash.REMOVED ) ) {

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     *          if the underlying collection's
     *          size has been modified since the iterator was created.
     */
    protected final int nextIndex() {
        if ( _expectedSize != _hash.size() ) {
            throw new ConcurrentModificationException();
        }


        byte[] states = _hash._states;
        int i = _index;
        while ( i-- > 0 && ( states[i] != TPrimitiveHash.FULL ) ) {

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     * will leave the underlying data structure in a confused
     * state.
     */
    public void remove() {
        if (_expectedSize != _hash.size()) {
            throw new ConcurrentModificationException();
        }


        // Disable auto compaction during the remove. This is a workaround for bug 1642768.
        try {
            _hash.tempDisableAutoCompaction();

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                // For either of these conditions to exist, the backing set
                // would have to have been concurrently modified, since we
                // wouldn't normally iterate over a key that isn't mapped to a
                // value
                if (values == null || values.size() == 0)
                    throw new ConcurrentModificationException(
                        "Expected at least one value mapped to " + getKey());
                values.remove(getValue());
                values.add(value);
                return super.setValue(value);
            }

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      try {
        lastRet = false;
        BiomeInfoSet.this.remove(--cursor);
        expectedModCount = modCount;
      } catch (IndexOutOfBoundsException e) {
        throw new ConcurrentModificationException();
      }
    }

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      }
    }


    protected final void checkForComodification() {
      if (BiomeInfoSet.this.modCount != expectedModCount)
        throw new ConcurrentModificationException();
    }

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    }


    @Override
    public void incrementSize(long expected) {
        if (size + 1 != expected)
            throw new ConcurrentModificationException("size: " + (size + 1) + ", expected: " + expected + ", Have you updated the chronicle without thread safety?");
        assert size == 0 || getIndexData(size) > 0 : "Failed to set the index at " + size + " was 0.";


        size++;
        appendingThread = null;
    }

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