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Update release notes. 

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RELEASE-NOTES.txt
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Commons Collections Generics Package
Version X.X
Release Notes
Apache Commons Collections
Version 4.0
RELEASE NOTES
INTRODUCTION:
Commons collections is a project to develop and maintain collection classes
based on and inspired by the JDK collection framework.
This version uses the generics features of JDK1.5 and is not compatible with
This version uses the generics features of Java 5 and is not compatible with
earlier JDK versions.
The process of generifying an API is complex.
For commons-collections, we have chosen to break the API in various ways.
The aim behind this is to provide an API design that better suits generics.
We have also removed all deprecated classes and fixed oddities in the previous
API that we couldn't fix due to backwards compatability restrictions.
API that we couldn't fix due to backwards compatibility restrictions.
As such, this release should not be considered to be a simple, drop-in, replacement
for commons-collections. You will probably receive compile errors, and you will
certainly have generification warnings to solve. These release notes will try
to guide you in the process of upgrading, however you should remember that this
is a new API based on the original, so some concepts have changed.
As such, this release can not be considered to be a simple, drop-in, replacement
for commons-collections. To help with the migration to this new version, the
package has changed to "org.apache.commons.collections4", thus it is possible
to have both commons-collections versions in the classpath.
These release notes will try to guide you in the process of upgrading, however you
should remember that this is a new API based on the original, so some concepts
have changed.
Major changes since 3.2.1
-------------------------
- Use of generics for the API
- Removed deprecated classes / methods and features which are now supported by the JDK
- Replaced Buffer interface with java.util.Queue
Changes from commons-collections
--------------------------------
- Removed all deprecated classes and methods
Removed classes
---------------
- Removed FastArrayList
- use CopyOnWriteList
- Removed FastHashMap
- use ConcurrentHashMap, but beware null keys and values
- Removed FastTreeSet
- no direct replacement - use ConcurrentHashMap or synchronized TreeMap
- Removed Typed* containers such as TypedList and TypedMap
- use generics for type safety, or Collections.checked*()
- Switch Abstract*Decorator classes to expose decorated() protected method
instead of the decorated collection directly. Each class overrides decorated()
to add its type covariantly, thus getList()/getSet() etc. methods are removed
o [COLLECTIONS-458] Removed unused class "AbstractUntypedCollectionDecorator<E, D>"
o [COLLECTIONS-432] Removed "Buffer" interface and all its implementations and related classes.
Replaced by "java.util.Queue", see also section [New classes]
- PriorityBuffer: use either java.util.PriorityQueue or java.util.concurrent.PriorityBlockingQueue
- SynchronizedBuffer: use the corresponding *BlockingQueue classes in java.util.concurrent
- BoundedBuffer: use either ArrayBlockingBuffer(capacity) or LinkedBlockingBuffer(capacity) in java.util.concurrent
- UnboundedFifoBuffer: use either java.util.LinkedList or java.util.concurrent.LinkedBlockingBuffer
o [COLLECTIONS-351] Removed features now supported by the JDK
- FastArrayList: use java.util.concurrent.CopyOnWriteArrayList
- FastHashMap: use java.util.concurrent.ConcurrentHashMap, but beware of null keys and values
- FastTreeSet: no direct replacement, use ConcurrentHashMap or a synchronized TreeMap
- IdentityMap: use java.util.IdentityHashMap
- ExtendedProperties: use commons-configuration
- Synchronized[List,Set,SortedSet]: use java.util.Collections.synchronized*()
- Typed* decorators: use generics for type safety, or java.util.Collections.checked*()
- [List,Set,Map]Utils.EMPTY_*: use the corresponding fields in java.util.Collections
o [COLLECTIONS-229] Removed deprecated collection classes and methods
Feedback
--------
Open source works best when you give feedback:
http://jakarta.apache.org/commons/collections/
New classes
-----------
Please direct all bug reports to JIRA
http://issues.apache.org/jira/browse/COLLECTIONS
o [COLLECTIONS-432] CircularFifoQueue - analogous class to CircularFifoBuffer for the Queue interface
PredicatedQueue - analogous class to PredicatedBuffer
TransformedQueue - analogous class to TransformedBuffer
UnmodifiableQueue - analogous class to UnmodifiableBuffer
QueueUtils - analogous class to BufferUtils
o [COLLECTIONS-422] PermutationIterator - generates unordered permutations of a collection. Thanks to Benoit Corne.
o [COLLECTIONS-404] SequencesComparator - an implementation of Eugene Myers difference algorithm in package o.a.c.c.sequence. Thanks to Jordane Sarda.
o [COLLECTIONS-396] LazyIteratorChain - a variant of IteratorChain which supports lazy initialization. Thanks to Jeff Rodriguez.
o [COLLECTIONS-322] NodeListIterator - supports iteration over a org.w3c.dom.NodeList. Thanks to Thomas Vahrst.
o [COLLECTIONS-313] CatchAndRethrowClosure - re-throws any checked exception as unchecked "FunctorException". Thanks to David J. M. Karlsen.
o [COLLECTIONS-275] IndexedCollection - collection decorator which provides a map-like view on an existing collection. Thanks to Stephen Kestle.
o [COLLECTIONS-258] DualLinkedHashBidiMap - bidi map implementation using LinkedHashMap instances. Thanks to Nathan Blomquist.
o [COLLECTIONS-242] Equator - interface for testing object equality.
o [COLLECTIONS-241] PassiveExpiringMap - map decorator which passively expires entries. Thanks to Elifarley Callado Coelho.
o [COLLECTIONS-8 ] ComparatorPredicate - predicate to compare objects against a fixed instance. Thanks to Rune Peter Bjørnstad.
Or subscribe to the commons-user mailing list (prefix emails by [collections])
http://jakarta.apache.org/site/mail.html
The Commons-Collections-Generics Team
New methods in *Utils
---------------------
o [COLLECTIONS-456] ListUtils#longestCommonSubsequence(...) to get the longest common subsequence of arbitrary lists or CharSequences.
o [COLLECTIONS-450] CollectionUtils#forAllButLastDo(Collection, Closure) and forAllButLastDo(Iterator, Closure). Thanks to J. Moldawski.
o [COLLECTIONS-446] CollectionUtils#isEqualCollection(Collection, Collection, Equator). Thanks to Matt Lachman.
o [COLLECTIONS-436] *Utils#emptyIfNull(*) methods in classes CollectionUtils, ListUtils, SetUtils and MapUtils. Thanks to Arman Sharif.
o [COLLECTIONS-429] CollectionUtils#containsAll(Collection, Collection) with guaranteed runtime complexity of O(n + m)
+COLLECTIONS-434] and space complexity of O(n). This method may yield much better performance than Collection.containsAll(Collection)
depending on the use-case and type of collection used. Thanks to Adrian Nistor, Mert Guldur.
o [COLLECTIONS-422] CollectionUtils#permutations(Collection) to generate all permutations of a collection. Thanks to Benoit Corne.
o [COLLECTIONS-405] ListUtils#select() and ListUtils#selectRejected() methods. Thanks to Adam Dyga.
o [COLLECTIONS-393] ListUtils#partition() to split a List into consecutive sublists. Thanks to Chris Shayan.
o [COLLECTIONS-383] CollectionUtils#forAllDo(Iterator, Closure). Thanks to Adrian Cumiskey.
o [COLLECTIONS-375] ListUtils#defaultIfNull(List, List). Thanks to Ivan Hristov.
o [COLLECTIONS-361] CollectionUtils#filterInverse(Iterable, Predicate). Thanks to Jean-Noel Rouvignac.
o [COLLECTIONS-306] CollectionUtils#subtract(Iterable, Iterable, Predicate). Thanks to Chris Shayan.
o [COLLECTIONS-296] CollectionUtils#collate(...) to merge two sorted Collections using the standard O(n) merge algorithm. Thanks to Julius Davies.
o [COLLECTIONS-286] CollectionUtils#extractSingleton(Collection). Thanks to Geoffrey De Smet.
o [COLLECTIONS-263] MapUtils#populateMap(MultiMap, ...) to support also "MultiMap" instances as input. Thanks to John Hunsley.
o [COLLECTIONS-235] ListUtils#indexOf(List, Predicate). Thanks to Nathan Egge.
o [COLLECTIONS-194] MapUtils#populateMap(Map, Collection, Transformer, ...). Thanks to Dave Meikle.
New features
------------
o [COLLECTIONS-399] Added new method "get(int)" to "CircularFifoQueue". Thanks to Sebb.
o [COLLECTIONS-327] Added serialVersionUID fields for "CompositeCollection", "CompositeSet", "EmptyMapMutator", "EmptySetMutator". Thanks to sebb.
o [COLLECTIONS-293] Added support for using custom "Equator" objects in "EqualPredicate". Thanks to Stephen Kestle.
o [COLLECTIONS-289] Added method "CollatingIterator#getIteratorIndex()". Thanks to Fredrik Kjellberg.
o [COLLECTIONS-285] Added serialization support for "TreeBidiMap". Thanks to Christian Gruenberg.
o [COLLECTIONS-272] Added serialization support for "FixedOrderComparator" and "TransformingComparator". Thanks to Chaitanya Mutyala.
o [COLLECTIONS-260] Added constructor "TransformingComparator(Transformer)". Thanks to Stephen Kestle.
o [COLLECTIONS-237] Added method "MultiValueMap#iterator()" to return a flattened version of "entrySet().iterator()".
Clarified javadoc for "entrySet()" that the returned Entry objects are unflattened, i.e. the Entry object
for a given key contains all values mapped to this key. Thanks to Nils Kaiser, Alan Mehlo.
o [COLLECTIONS-226] Added method "ListOrderedMap#putAll(int, Map)". Thanks to Vasily Ivanov.
o [COLLECTIONS-213] Added support for resettable iterators in "IteratorIterable". Thanks to Dusan Chromy.
Changed classes / methods
-------------------------
o [COLLECTIONS-454] An iterator over a "Flat3Map#entrySet()" will now return independent Map.Entry objects that will
not change anymore when the iterator progresses.
o [COLLECTIONS-452] Change base package to "org.apache.commons.collections4".
o [COLLECTIONS-451] The constructors for all *Utils classes are now private to prevent instantiation.
o [COLLECTIONS-424] "CompositeSet" does not inherit from "CompositeCollection" anymore. The inner class "SetMutator"
has been updated accordingly. Thanks to Michael Pradel.
o [COLLECTIONS-382] Change maven coordinates to "org.apache.commons.commons-collections4". Thanks to Olivier Lamy.
o [COLLECTIONS-381] Move the project structure to a standard maven layout. Thanks to Olivier Lamy.
o [COLLECTIONS-372] TransformingComparator now supports different types for its input/output values.
o [COLLECTIONS-362] "CollectionUtils#filter(Iterable, Predicate)" will now return whether the collection has been modified.
Thanks to Jean-Noel Rouvignac.
o [COLLECTIONS-341] "NOPClosure" is now a final class. Thanks to Goran Hacek.
o [COLLECTIONS-324] Fields transformer and decorated in class "TransformingComparator" are now final. Thanks to sebb.
o [COLLECTIONS-307] "SetUniqueList#subList()" will now return an unmodifiable list as changes to it may invalidate the parent list.
Thanks to Christian Semrau, Thomas Vahrst.
o [COLLECTIONS-298] Calling "CollectionUtils#sizeIsEmpty(null)" will now return true. Thanks to Benjamin Bentmann.
o [COLLECTIONS-280] The predicate that rejected an object to be added to a "PredicatedCollection" is now contained in the
respective exception message. Thanks to Chris Lewis.
o [COLLECTIONS-265] "TreeBag" will now only accept "Comparable" objects as input when used with natural ordering. Thanks to David Saff.
o [COLLECTIONS-251] The static factory methods have been renamed from "getInstance()" to a camel-case version of the class name,
+COLLECTIONS-321] e.g. "truePredicate()" for class "TruePredicate". Thanks to Stephen Kestle.
o [COLLECTIONS-240] "MultiValueMap" is now serializable. Thanks to Wouter de Vaal.
o [COLLECTIONS-231] Return concrete class in static factory methods instead of base class interface
(except for Unmodifiable decorators). Thanks to Torsten Curdt.
o [COLLECTIONS-230] "CollectionUtils#size(Collection)" now returns 0 when called with null as input. Thanks to Stepan Koltsov,sebb.
+COLLECTIONS-297]
+COLLECTIONS-318]
o [COLLECTIONS-223] "CollectionUtils#addAll(...)" methods now return if the collection has been changed by this operation.
Thanks to Vasily Ivanov.
o [COLLECTIONS-221] "CompositeCollection", "CompositeMap" and "CompositeSet" are now serializable. Thanks to Pal Denes.
o [COLLECTIONS-218] The "CollectionUtils#select(Collection, Predicate, Collection)" method will now return the output collection.
o [COLLECTIONS-182] "CollectionUtils#forAllDo(Collection, Closure)" now returns the provided closure. Thanks to Jim Cakalic.
o [COLLECTIONS-110] Make generic versions of all classes in collections.
+COLLECTIONS-243]
+COLLECTIONS-245]
+COLLECTIONS-247]
+COLLECTIONS-253]
+COLLECTIONS-273]
+COLLECTIONS-282]
o [None ] Switch Abstract*Decorator classes to expose decorated() protected method instead of the decorated collection directly.
Each class overrides decorated() to add its type covariantly, thus getList()/getSet() etc. methods are removed
Fixed Bugs
----------
o [COLLECTIONS-447] Tree traversal with a TreeListIterator will not be affected anymore by the removal of an element directly after
a call to previous(). Thanks to Jeffrey Barnes.
o [COLLECTIONS-445] Adapt and/or ignore several unit tests when run on a IBM J9 VM (specification version 1.6.0) due to a faulty
"java.util.TreeMap" implementation.
o [COLLECTIONS-444] SetUniqueList.set(int, E) now works correctly if the object to be inserted is already placed at the given position.
Thanks to Thomas Vahrst, John Vasileff.
o [COLLECTIONS-441] MultiKeyMap.clone() now correctly calls super.clone(). Thanks to Thomas Vahrst.
o [COLLECTIONS-433] Improve performance of "TreeList#addAll" and "TreeList(Collection)" by converting the input collection into an
AVL tree and efficiently merge it into the existing tree. Thanks to Jeffrey Barnes.
o [COLLECTIONS-427] Fixed performance issue in "SetUniqueList#retainAll" method for large collections. Thanks to Mert Guldur.
o [COLLECTIONS-426] Fixed performance issue in "ListOrderedSet#retainAll" method for large collections. Thanks to Adrian Nistor.
o [COLLECTIONS-425] Improved performance of "ListOrderedMap#remove(Object)" method. Thanks to Adrian Nistor.
o [COLLECTIONS-421] Update javadoc for "ListUtils#lazyList()" and "ListUtils#fixedSizeList()". Thanks to Benedikt Ritter.
o [COLLECTIONS-419] Added clarifying javadoc wrt runtime complexity of "AbstractDualBidiMap#retainAll". Thanks to Adrian Nistor.
o [COLLECTIONS-417] Added clarifying javadoc wrt runtime complexity of "AbstractLinkedList#retainAll". Thanks to Adrian Nistor.
o [COLLECTIONS-415] Added clarifying javadoc wrt runtime complexity of "AbstractLinkedList#removeAll". Thanks to Adrian Nistor.
o [COLLECTIONS-414] Fixed several compilation issues with older Java 1.6 compilers.
o [COLLECTIONS-413] Improved performance of "removeAll()" method for sets returned by "DualHashBidiMap#entrySet()". Thanks to Adrian Nistor.
o [COLLECTIONS-412] Improved performance of "CollectionUtils#subtract" methods. Thanks to Adrian Nistor.
o [COLLECTIONS-411] Fixed possible "IndexOutOfBoundsException" in "ListOrderedMap#putAll". Thanks to Adrian Nistor.
o [COLLECTIONS-410] Improved performance of "SetUniqueList#addAll" method. Thanks to Adrian Nistor.
o [COLLECTIONS-409] Improved performance of "ListOrderedSet#addAll" method. Thanks to Adrian Nistor.
o [COLLECTIONS-408] Improved performance of "SetUniqueList#removeAll". Thanks to Adrian Nistor.
o [COLLECTIONS-407] Improved performance of "ListOrderedSet#remove(Object)" in case the object is not contained in the Set. Thanks to Adrian Nistor.
o [COLLECTIONS-406] Improved performance of "ListUtils#subtract" method. Thanks to Adrian Nistor.
o [COLLECTIONS-400] Added missing null check in "CollectionUtils#addIgnoreNull(Collection, Object)". Thanks to Shin Hwei Tan.
o [COLLECTIONS-391] Fixed javadoc for "MapUtils#toProperties(Map)". Thanks to Shin Hwei Tan.
o [COLLECTIONS-389] Clarified javadoc for "TransformerUtils#mapTransformer" for null input. Thanks to Shin Hwei Tan.
o [COLLECTIONS-388] Clarified javadoc for "FactoryUtils#prototypeFactory" for null input. Thanks to Shin Hwei Tan.
o [COLLECTIONS-384] Fixed inconsistent javadoc for "MapUtils#synchronizedMap(Map)". Thanks to Shin Hwei Tan.
o [COLLECTIONS-380] Fixed infinite loop when calling "UnmodifiableBoundedCollection#unmodifiableBoundedCollection()". Thanks to Dave Brosius.
o [COLLECTIONS-379] Fixed javadoc for several methods wrt expected NullPointerExceptions. Thanks to Shin Hwei Tan.
o [COLLECTIONS-364] "DualTreeBidiMap" now uses the correct comparator for the reverse map during de-serialization.
o [COLLECTIONS-363] "TransformedMap" in the package "splitmap" can now be serialized.
o [COLLECTIONS-360] "FilterListIterator#hasNext" does not throw a NullPointerException anymore to comply to the Java iterator specification.
Thanks to Sai Zhang.
o [COLLECTIONS-359] "ListUtils#intersection(List, List)" will now also work correctly if there are duplicate elements in the provided lists.
Thanks to Mark Shead.
o [COLLECTIONS-352] "AbstractCollectionDecorator" will now use internally "decorated()" to access the decorated collection. Thanks to Adam Gent.
o [COLLECTIONS-350] Removed debug output in "MapUtils#getNumber(Map)". Thanks to Michael Akerman.
o [COLLECTIONS-348] Fixed javadoc for all "transformedXXX(XXX)" methods in the respective Utils classes to clarify that existing objects in the
list are not transformed. Thanks to Paul Benedict.
o [COLLECTIONS-343] Singleton classes in package "functors" are now correctly de-serialized. Thanks to Goran Hacek.
o [COLLECTIONS-340] Removed broken methods "equals(Object)" and "hashCode()" in class "NOPClosure". Thanks to Goran Hacek.
o [COLLECTIONS-336] Simplified exceptions as the cause is available from the parent. Thanks to sebb.
o [COLLECTIONS-335] Fixed cache assignment for "TreeBidiMap#entrySet". Thanks to sebb.
o [COLLECTIONS-334] Synchronized access to lock in "StaticBucketMap#size()". Thanks to sebb.
o [COLLECTIONS-332] Added clarification to javadoc of "ListOrderedMap" that "IdentityMap" and "CaseInsensitiveMap" are not supported.
Thanks to Tom Parker.
o [COLLECTIONS-331] Improve javadoc of "CollatingIterator" wrt the used "Comparator" and throw a NullPointerException in "CollatingIterator#least"
if no comparator is set. Thanks to Michael Krkoska.
o [COLLECTIONS-330] "LRUMap#keySet()#remove(Object)" will not throw a "ConcurrentModificationException" anymore. Thanks to Joerg Schaible.
o [COLLECTIONS-328] Improved performance of "ListUtils#intersection(List, List)". Thanks to Thomas Rogan, Jilles van Gurp.
o [COLLECTIONS-323] Changed behavior of "CaseInsensitiveMap" constructor to be compliant with "HashMap" in case the initial capacity is set to zero.
Thanks to Maarten Brak.
o [COLLECTIONS-320] Improved performance of "StaticBucketMap#putAll(Map)" by iterating over the entry set. Thanks to sebb.
o [COLLECTIONS-319] Avoid redundant null check in "IteratorUtils#getIterator(Object)". Thanks to sebb.
o [COLLECTIONS-317] Use a private method to populate the object in "AbstractHashedMap(Map)". Thanks to sebb.
o [COLLECTIONS-316] Fixed javadoc of "LRUMap" wrt to the maxSize parameter of the constructor. Thanks to ori.
o [COLLECTIONS-312] Use of final keyword where applicable, minor performance improvements by properly initializing the capacity of newly created
collections when known in advance. Thanks to Peter Lawrey, Gary Gregory.
o [COLLECTIONS-307] "SetUniqueList#subList()#contains(Object)" will now correctly check the subList rather than the parent list.
Thanks to Christian Semrau.
o [COLLECTIONS-304] "SetUniqueList#set(int, Object)" will now correctly enforce the uniqueness constraint. Thanks to Rafał Figas,Bjorn Townsend.
o [COLLECTIONS-303] Improved javadoc for "Unmodifiable*" classes wrt behavior when the users tries to modify the collection. Thanks to Emmanuel Bourg.
o [COLLECTIONS-294] "CaseInsensitiveMap" will now convert input strings to lower-case in a locale-independant manner. Thanks to Benjamin Bentmann.
o [COLLECTIONS-256] Fixed javadoc for "ListUtils#transformedList(List)" to clarify that existing objects in the list are not transformed.
+COLLECTIONS-288] Thanks to Paul Benedict.
o [COLLECTIONS-266] "MultiKey" will now be correctly serialized/de-serialized. Thanks to Joerg Schaible.
o [COLLECTIONS-262] Fixed javadoc for methods "firstKey()" and "lastKey()" in class "AbstractLinkedMap". Thanks to Lisen Mu.
o [COLLECTIONS-261] "Flat3Map#remove(Object)" will now return the correct value mapped to the removed key if the size of the map is less or equal 3.
Thanks to ori.
o [COLLECTIONS-255] Removed unused variables in "TreeBidiMap". Thanks to Henri Yandell.
o [COLLECTIONS-249] "SetUniqueList.addAll(int, Collection)" now correctly add the collection at the provided index. Thanks to Joe Kelly.
o [COLLECTIONS-232] Fixed several unit tests which were using parameters to "assertEquals(...)" in wrong order. Thanks to Mark Hindess.
o [COLLECTIONS-228] "MultiValueMap#put(Object, Object)" and "MultiValueMap#putAll(Object, Collection)" now correctly return if the map
has changed by this operation.
o [COLLECTIONS-219] "CollectionUtils#removeAll" wrongly called "ListUtils#retainAll". Thanks to Tom Leccese.
o [COLLECTIONS-217] Calling "setValue(Object)" on any Entry returned by a "Flat3Map" will now correctly set the value for the current entry.
Thanks to Matt Bishop.
o [COLLECTIONS-216] "MultiKey#toString()" will now use "Arrays#toString(List)". Thanks to Hendrik Maryns.
For complete information on Commons Collections, including instructions on how to submit bug reports,
patches, or suggestions for improvement, see the Apache Commons Collections website:
http://commons.apache.org/proper/commons-collections/

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src/changes/changes.xml
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@ -74,7 +74,7 @@
Replaced "Buffer" interface with "java.util.Queue". Kept "CircularFifoQueue"
as well as "Predicated", "Transformed" and "Unmodifiable" decorators.
</action>
<action issue="COLLECTIONS-429,COLLECTION-434" dev="tn" type="add" due-to="Adrian Nistor, Mert Guldur">
<action issue="COLLECTIONS-429,COLLECTIONS-434" dev="tn" type="add" due-to="Adrian Nistor, Mert Guldur">
Added method "CollectionUtils#containsAll(Collection, Collection)" with guaranteed
runtime complexity of O(n + m) and space complexity of O(n). This method may yield much
better performance than "Collection#containsAll(Collection)" depending on the use-case and
@ -446,7 +446,7 @@
<action issue="COLLECTIONS-182" dev="mbenson" type="update" due-to="Jim Cakalic">
"CollectionUtils#forAllDo(Collection, Closure)" now returns the provided closure.
</action>
<action issue="COLLECTIONS-110,COLLECTIONS-243,COLLECTION-245,COLLECTIONS-247,
<action issue="COLLECTIONS-110,COLLECTIONS-243,COLLECTIONS-245,COLLECTIONS-247,
COLLECTIONS-253,COLLECTIONS-273,COLLECTIONS-282" dev="multiple" type="update">
Make generic versions of all classes in collections.
</action>