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


      final void removeDescending() {
        if (lastReturned == null)
          throw new IllegalStateException();
        if (m.modCount != expectedModCount)
          throw new ConcurrentModificationException();
        m.deleteEntry(lastReturned.entry);
        lastReturned = null;
        expectedModCount = m.modCount;
      }

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        protected HashEntry nextEntry()
        {
            if ( parent.modCount != expectedModCount )
            {
                throw new ConcurrentModificationException( );
            }
            HashEntry newCurrent = next;
            if ( newCurrent == null )
            {
                throw new NoSuchElementException( AbstractHashedMap.NO_NEXT_ENTRY );

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            {
                throw new IllegalStateException( AbstractHashedMap.REMOVE_INVALID );
            }
            if ( parent.modCount != expectedModCount )
            {
                throw new ConcurrentModificationException( );
            }
            parent.remove( last.getKey( ) );
            last = null;
            expectedModCount = parent.modCount;
        }

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        public long next(ByteBuffer result) {
            if(_indexesLeft <= 0) {
                throw new IllegalStateException();
            }
            if(_initialTotalIndexes!=_totalIndexes){
                throw new ConcurrentModificationException();
            }
            _offsetInChunk++;
            while(_offsetInChunk >= _totalIndexesWithinChunks[_chunkOffset]){
                _chunkOffset++;
                _offsetInChunk = 0;

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        public long next(ByteBuffer result) {
            if(_indexesLeft <= 0) {
                throw new IllegalStateException();
            }
            if(_initialTotalIndexes!=_totalIndexes){
                throw new ConcurrentModificationException();
            }
            _offsetInChunk--;
            while(_offsetInChunk < 0 ||_totalIndexesWithinChunks[_chunkOffset]<=0){
                _chunkOffset--;
                _offsetInChunk = _totalIndexesWithinChunks[_chunkOffset]-1;

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            _expectedModCount++;
        }


        protected void checkForComod() {
            if(_expectedModCount != _modCount) {
                throw new ConcurrentModificationException();
            }
        }

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            }
        }


        protected void checkForComod() {
            if(!_valid) {
                throw new ConcurrentModificationException();
            }
        }

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     *
     * @throws ConcurrentModificationException
     */
    protected void checkForComod() throws ConcurrentModificationException {
        if(_modCount != _list._modCount) {
            throw new ConcurrentModificationException();
        }
    }

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    public void app( Domain d, StageElement next, MatchOrBind s )
        {
        int i = size, initialChanges = changes;
        while (i > 0) 
            {
            if (changes > initialChanges) throw new ConcurrentModificationException();
            if (s.matches( elements[--i] )) next.run( d );
            }
        }

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            protected int i = size;
            protected final Triple [] e = elements;
            
            @Override public boolean hasNext()
                { 
                if (changes > initialChanges) throw new ConcurrentModificationException();
                return i > 0; 
                }
        
            @Override public Triple next()
                {
                if (changes > initialChanges) throw new ConcurrentModificationException();
                if (i == 0) noElements( "no elements left in ArrayBunch iteration" );
                return e[--i]; 
                }
            
            @Override public void remove()
                {
                if (changes > initialChanges) throw new ConcurrentModificationException();
//                System.err.println( ">> ArrayBunch.iterator::remove" );
//                System.err.println( "++  size currently " + size );
//                System.err.println( "++  container is " + container );
//                System.err.println( "++  selector currently " + i + " (triple " + e[i] + ")" );
                int last = --size;

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