This release focusses on bug fixes and minor enhancements. No deprecations have occurred.

• ReferenceMap - No longer extends AbstractMap, only an issue if you previously cast to AbstractMap
• FixedSizeSortedMap - No longer extends AbstractSortedMapDecorator, only an issue if you previously cast to AbstractSortedMapDecorator

• MultiKeyMap - A map that allows multiple keys to be used to map the value
• SingletonMap - fully featured singleton Map implementation
• TransformedPredicate - A predicate where the input object is transformed [26946]
• ObjectGraphIterator - An iterator that can iterate over a graph of objects
• MapBackedSet - Set created by decorating a map
• ReferenceIdentityMap - Similar to ReferenceMap, but matching keys and values by identity [26503]
• AbstractReferenceMap - New base class for reference maps [26503]
• AbstractInputCheckedMapDecorator - New base class for map decorators that validate or alter input

• ReferenceMap - Changed to extend AbstractReferenceMap, thus gaining a mapIterator() and subclassability [26503]
• Fast3Map - Add clone() method
• MultiKey - Add getKey(index) and size() methods and make constructor public
• MultiHashMap - Add five methods to improve the API
• AbstractHashedMap,AbstractLinkedMap - Add methods to access entry methods when protected scope blocks
• Functors - Add get methods to retrieve internal state [27515]
• Functors - Add additional getInstance() methods for consistency [27856,27857]
• CollectionUtils - get(Object,int) method now supports primitive arrays
• CollectionUtils - cardinality() now works faster for Set and Bag instances [28629]
• CollectionUtils - Add size(Object) method to find the size of various collection-like objects [27909]
• SingletonIterator - make remove() functionality optional
• AbstractLinkedList/NodeCachingLinkedList - added getValue() and setValue() to Node, and made everything use them
• LRUMap - The addMapping() method now uses isFull() to determine whether it is full
• LRUMap - Add boolean flag, scanUntilRemovable, giving the removeLRU() method more power [28887]

Made Serializable

• Fast3Map [27946]
• FixedSizeMap/SortedMap [18815]
• LazyMap/SortedMap [18815]
• ReferenceMap [18815]
• ListOrderedMap [18815]
• PredicatedMap/SortedMap [18815]
• TransformedMap/SortedMap [18815]
• TypedMap/SortedMap [18815]
• UnmodifiableMap/SortedMap/OrderedMap [18815]
• TiedMapEntry

• Map/BidiMap implementations only checked key and not value in entry set contains(Object) and remove(Object)
• AbstractHashedMap subclasses failed to clone() correctly [27159]
• ExtendedProperties - Close input stream in constructor [27737]
• Flat3Map - Handle infinite loops in toString
• LRUMap - The removeLRU() method was passed the wrong LinkEntry [28433]
• EnumIterator/MapUtils - Changed enum references to enable JDK 1.5 compliance
• UnmodifiableSortedBag - Fix to ensure unmodifiable

• Bag - Indicate that no changes are likely to the interface despite its problems
• TreeBidiMap - Add javadoc about requiring Comparable entries [26470]
• MultiKey - Add extra explanatations, examples and warnings
• MultiMap,MultiHashMap - Add extra documentation to clarify the interface and implementation
• XxxUtils - Clarify the internal workings of the predicated decorator classes [28115]
• BidiMap - Clarify 1 to 1 nature of the map
• AbstractHashedMap - Fix isEqualValue() javadoc to refer to value not key
• LRUMap - Added extra javadoc about method implementations
• BoundedCollection/UnmodifiableBoundedCollection - reword to avoid misunderstandings
• Closure/Predicate/Transformer/Factory - Additional javadoc with links
• ClosureUtils/PredicateUtils/TransformerUtils/FactoryUtils - Additional links to implementations