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

                } else {
                    prev = e;
                }
            }


            throw new ConcurrentModificationException();
        }

View Full Code Here

        public Entry next() {
            final byte[] k = this.i.next();
            assert k != null;
            if (k == null) return null;
            this.c = (int) Table.this.index.get(k);
            if (this.c < 0) throw new ConcurrentModificationException(); // this should only happen if the table was modified during the iteration
            final byte[] b = new byte[Table.this.rowdef.objectsize];
            final Row.Entry cacherow;
            if (Table.this.table == null || (cacherow = Table.this.table.get(this.c, false)) == null) {
                // read from file
                try {

View Full Code Here

            _expectedModCount++;
        }


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

View Full Code Here

            }
        }


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

View Full Code Here

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

View Full Code Here


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

View Full Code Here

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

View Full Code Here

        else
          e = null;
        if (e == null || e.entry == null || e.getKey() == fenceKey)
          throw new NoSuchElementException();
        if (m.modCount != expectedModCount)
          throw new ConcurrentModificationException();
        next.assign(OMVRBTree.next(e));
        lastReturned = e;
        return e;
      }

View Full Code Here

        else
          e = null;
        if (e == null || e.entry == null || e.getKey() == fenceKey)
          throw new NoSuchElementException();
        if (m.modCount != expectedModCount)
          throw new ConcurrentModificationException();
        next.assign(OMVRBTree.previous(e));
        lastReturned = e;
        return e;
      }

View Full Code Here


      final void removeAscending() {
        if (lastReturned == null)
          throw new IllegalStateException();
        if (m.modCount != expectedModCount)
          throw new ConcurrentModificationException();
        // deleted entries are replaced by their successors
        if (lastReturned.entry.getLeft() != null && lastReturned.entry.getRight() != null)
          next = lastReturned;
        m.deleteEntry(lastReturned.entry);
        lastReturned = null;

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of java.util.ConcurrentModificationException

cofh.lib.world.biome.BiomeInfoSet$Itr

com.alibaba.fastjson.util.AnticollisionHashMap$HashIterator

com.blazebit.collection.TrieMap$TrieIterator

com.esotericsoftware.kryo.Kryo

com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection

com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator

com.google.common.collect.AbstractMapBasedMultiset$MapBasedMultisetIterator

com.google.common.collect.MinMaxPriorityQueue$QueueIterator

com.google.common.collect.TreeMultiset

com.google.gwt.dev.util.collect.HashSet$SetIterator

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.