diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..3d47f986c41db29ec6dc0d5036bf760b3a1cf366
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.idea/
+target/
+.settings/
+*.iml
+.project
+.classpath
\ No newline at end of file
diff --git a/RELEASE-NOTES.txt b/RELEASE-NOTES.txt
new file mode 100644
index 0000000000000000000000000000000000000000..78766bfbb1909fad4daa12f5ebaf644aa5c338f0
--- /dev/null
+++ b/RELEASE-NOTES.txt
@@ -0,0 +1,163 @@
+
+              Apache Commons Collections
+                     Version 4.1
+                    RELEASE NOTES
+
+INTRODUCTION:
+
+Apache Commons Collections is a project to develop and maintain collection
+classes based on and inspired by the JDK collection framework.
+
+This v4.1 release is a minor and security release, fixing several bugs present in
+previous releases of the 4.X branch. Additionally, this release provides a mitigation
+for a known remote code exploitation via the standard java object serialization
+mechanism. Serialization support for unsafe classes in the functor package has been
+completely removed (classes do not implement the Serializable interface anymore).
+For more details, please refer to COLLECTIONS-580.
+
+All users are strongly encouraged to updated to this release.
+
+
+Compatibility
+-------------
+
+ o Java 6 or later is now required (previous version 4.0 required Java 5).
+ o This release is source and binary compatible with the previous 4.0 release
+   of Commons Collections with the exception that some classes in the functor
+   package do not implement the Serializable interface anymore (see COLLECTIONS-580). 
+ o some unit tests are disabled when executed with an IBM JDK 6 due to a faulty
+   java.util.TreeMap implementation.
+
+Major changes since 4.0
+-----------------------
+
+ o Added interface MultiSet (package multiset)
+ o Added interfaces MultiValuedMap, ListValuedMap and SetValuedMap (package multimap) 
+ o Added fluent API for Iterable instances (class FluentIterable)
+
+
+Changes
+-------
+
+o [COLLECTIONS-580]: Serialization support for unsafe classes in the functor package
+                     has been removed as this can be exploited for remote code execution
+                     attacks. Classes considered to be unsafe are: CloneTransformer,
+                     ForClosure, InstantiateFactory, InstantiateTransformer, InvokerTransformer,
+                     PrototypeCloneFactory, PrototypeSerializationFactory, WhileClosure. 
+o [COLLECTIONS-551]: Deprecated various method in "CollectionUtils" in favor of similar
+                     methods in the newly introduced "IterableUtils". 
+o [COLLECTIONS-570]: All constructors and static factory methods will now throw a "NullPointerException"
+                     if a required input argument is null. Previously sometimes a "IllegalArgumentException"
+                     was used. 
+o [COLLECTIONS-571]: Deprecated methods "synchronizedCollection(Collection)" and
+                     "unmodifiableCollection(Collection)" in class "CollectionUtils", the corresponding
+                     methods in "java.util.Collections" should be used instead. 
+o [COLLECTIONS-562]: Upgraded minimum java requirement to Java 6 (up from Java 5). 
+
+
+New features
+------------
+
+o [COLLECTIONS-508]: Added new interfaces "MultiValuedMap", "ListValuedMap" and "SetValuedMap"
+                     as a replacement for "MultiMap". Decorators and implementations reside in
+                     the "multimap" package and a "MultiMapUtils" class has been added.
+                     The existing interface "MultiMap" as well as the concrete implementation
+                     "MultiValueMap" has been deprecated. 
+o [COLLECTIONS-567]: Added new MultiSet interface which is intended to be a replacement for
+                     the Bag interface. The main difference is that a MultiSet is fully compatible
+                     to the Collection contract. 
+o [COLLECTIONS-572]: Added set operations to "SetUtils": union, difference, intersection and disjunction.
+                     The operations return a view of the result that is backed by the input sets. 
+o [COLLECTIONS-557]: Added support to specify the initial size of a "LRUMap". Thanks to Philippe Mouawad. 
+o [COLLECTIONS-565]: Added decorators for "NavigableSet" interface. 
+o [COLLECTIONS-464]
+  +COLLECTIONS-442]: Added new class "FluentIterable" to support a fluent API for manipulating
+                     Iterable instances. Additionally various supporting methods have been
+                     added to "IterableUtils" and "IteratorUtils". 
+o [COLLECTIONS-464]: Added new "ZippingIterator" and factory methods "IteratorUtils#zippingIterator(...)". 
+o [COLLECTIONS-464]: Added new decorator "SkippingIterator" and factory methods "IteratorUtils#skippingIterator(...)". 
+o [COLLECTIONS-556]: Added method "SetUtils#newIdentityHashSet()" which returns a new identity HashSet
+                     using reference-equality instead of object-equality. 
+o [COLLECTIONS-395]: Added method "LRUMap#get(Object, boolean)" that allows to query the map
+                     without affecting the least recently used order. Thanks to David Hawthorne. 
+o [COLLECTIONS-427]: Added "toString(...)" methods to newly created "IterableUtils" and existing "IteratorUtils"
+                     to get a string representation of an Iterable/Iterator instance similar to "Arrays#toString(...)".
+                     Thanks to Gonçalo Marques. 
+o [COLLECTIONS-539]: Changed scope of "CircularFifoQueue#isAtFullCapacity()" to public. Thanks to Guram Savinov. 
+o [COLLECTIONS-511]: Added new methods "IterableUtils#partition(...)" to partition an input collection
+                     into separate output collections based on evaluation of one or more predicates.
+                     Thanks to Nathan Blomquist, Brent Worden. 
+o [COLLECTIONS-529]: Added methods "removeAll(...)" and "retainAll(...)" to "CollectionUtils" that perform
+                     equality checks using the provided "Equator" object instead of "Object#equals()".
+                     Thanks to Alexander Muthmann, Dipanjan Laha. 
+o [COLLECTIONS-503]: Added new transformer "IfTransformer" and factory methods "TransformerUtils#ifTransformer(...)"
+                     which replace "TransformerUtils#switchTransformer(Predicate, Transformer, Transformer)".
+                     Thanks to Josh Cain. 
+o [COLLECTIONS-471]: Added new decorator "BoundedIterator" and factory methods "IteratorUtils#boundedIterator(...)".
+                     Thanks to Radford Tam. 
+
+
+Fixed Bugs
+----------
+
+o [COLLECTIONS-580]: Added validation when de-serializing a "MultiValueMap#ReflectionFactory":
+                     only Collection classes are allowed, otherwise an UnsupportedOperationException
+                     will be thrown during de-serialization. 
+o [COLLECTIONS-576]: Subclasses of MultiKey did not re-calculate their hashcode after de-serialization.
+                     Thanks to Stephan Roch. 
+o [COLLECTIONS-566]: "IteratorUtils#collate(...)" methods did not use natural ordering when a
+                     null comparator was provided. 
+o [COLLECTIONS-558]: Changed return type of "ListOrderedSet#remove(int)" from Object to the generic
+                     type parameter. Thanks to Felix Rabe. 
+o [COLLECTIONS-555]: Added clarification to javadoc of "TreeBag#add(Object)" wrt null arguments.
+                     Thanks to M Kim. 
+o [COLLECTIONS-427]: Reverted performance improvement for "SetUniqueList#retainAll(Collection)"
+                     introduced in 4.0. Added clarifying javadoc wrt runtime complexity instead. 
+o [COLLECTIONS-426]: Reverted performance improvement for "ListOrderedSet#retainAll(Collection)"
+                     introduced in 4.0. Added clarifying javadoc wrt runtime complexity instead. 
+o [COLLECTIONS-530]: Added a Builder for "PredicatedCollection". Elements added to the builder
+                     that fail the predicate will not throw an IllegalArgumentException. The builder
+                     supports creating predicated lists, bags, sets and queues. Thanks to Erik. 
+o [COLLECTIONS-545]: Documented runtime complexity of "CollectionUtils#removeAll(Collection, Collection).
+                     Thanks to Oswaldo Olivo. 
+o [COLLECTIONS-543]: "AbstractCollectionDecorator" doesn't forward equals and hashCode anymore. 
+o [COLLECTIONS-544]: Documented runtime complexity of "CollectionUtils#retainAll(Collection, Collection).
+                     Thanks to Oswaldo Olivo. 
+o [COLLECTIONS-542]: "AbstractHashedMap" still inherits from "AbstractMap", contrary to what
+                     the class javadoc stated. The inheritance will now be removed in v5.0. 
+o [COLLECTIONS-525]: The map returned by "PatriciaTrie#prefixMap()" did not contain all keys
+                     that are prefixed by the given search key in some rare cases. Thanks to Zigler Zhang. 
+o [COLLECTIONS-537]: Harmonized signature of factory methods for functor-related classes which take
+                     a collection as input with their array counterparts. Thanks to Frank Jakop. 
+o [COLLECTIONS-540]: Added overloaded method "CollectionUtils#get(Enumeration, int)" and simplified
+                     code for "CollectionUtils#get(Object, int)". Thanks to Daniel Stewart, Issam El Atif. 
+o [COLLECTIONS-536]: Improved check for null input in "MapUtils#putAll(Map, Object[])". Thanks to Tagir Valeev. 
+o [COLLECTIONS-534]: Added clarifying javadoc wrt runtime complexity of "CollectionBag#retainAll".
+                     Thanks to Oswaldo Olivo. 
+o [COLLECTIONS-531]: Use correct type bounds in
+                     "CollectionUtils#isEqualCollection(Collection, Collection, Equator)" to
+                     prevent a "ClassCastException" at runtime for invalid inputs. Thanks to Dipanjan Laha. 
+o [COLLECTIONS-523]: Removed unneeded private method in "PassiveExpiringMap". Thanks to Thiago Andrade. 
+o [COLLECTIONS-516]: Added clarification to the javadoc of "MapUtils#toProperties(Map)" in case
+                     of null keys/values. Thanks to Cyrille Artho. 
+o [COLLECTIONS-524]: "ListOrderedSet#listOrderedSet(List)" did not remove duplicates from the
+                     input list as advertised in the javadoc. Thanks to J Goodfellow. 
+o [COLLECTIONS-521]: "MultiKeyMap" was throwing a "NullPointerException" for various operations
+                     if two key arguments have been used and the second was "null". Thanks to Maxime Nay. 
+o [COLLECTIONS-522]: Updated code example for "PredicatedList". Thanks to Erik. 
+o [COLLECTIONS-512]: "TransformingComparator" and "FixedOrderComparator" did not comply with
+                     the contract of "Object#equals". Thanks to Cyrille Artho. 
+o [COLLECTIONS-510]: Fix compilation errors when using source level 1.8 and a recent java 8 compiler.
+                     Thanks to Hollis Waite. 
+o [COLLECTIONS-509]: Clarified javadoc of "CollectionBag" wrt changes from the original Bag interface. 
+o [COLLECTIONS-507]: Removed wrong type bounds for "ComparatorUtils#chainedComparator(...)". Thanks to Gerson. 
+o [COLLECTIONS-506]: Added javadoc clarification to class "CollectionUtils" that input objects which
+                     override "Object#equals(Object)" must also maintain the general contract of
+                     "Object#hashCode()" as various utility methods take advantage of sets/maps/bags.
+                     Thanks to Anthony Communier. 
+
+ 
+For complete information on Apache Commons Collections, including instructions on how to submit bug reports,
+patches, or suggestions for improvement, see the Apache Apache Commons Collections website:
+
+http://commons.apache.org/proper/commons-collections/
diff --git a/apache_big.png b/apache_big.png
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diff --git a/pom.xml b/pom.xml
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index 0000000000000000000000000000000000000000..90c0f0367efb307dabc74eaef323fa1e020d5cc5
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,114 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <!-- Inherited Icy Parent POM -->
+    <parent>
+        <groupId>org.bioimageanalysis.icy</groupId>
+        <artifactId>parent-pom-plugin</artifactId>
+        <version>1.0.3</version>
+    </parent>
+
+    <!-- Project Information -->
+    <artifactId>apache-commons-collections</artifactId>
+    <version>4.4</version>
+
+    <packaging>jar</packaging>
+
+    <name>Apache Commons Collections</name>
+    <description>
+        The Apache Commons Collections Library.
+
+        The Java Collections Framework was a major addition in JDK 1.2. It added many powerful data structures that accelerate development of most significant Java applications. Since that time it has become the recognised standard for collection handling in Java.
+    </description>
+    <url>http://icy.bioimageanalysis.org/plugin/apache-commons-collections/</url>
+    <inceptionYear>2020</inceptionYear>
+
+    <organization>
+        <name>Institut Pasteur</name>
+        <url>https://pasteur.fr</url>
+    </organization>
+
+    <licenses>
+        <license>
+            <name>GNU GPLv3</name>
+            <url>https://www.gnu.org/licenses/gpl-3.0.en.html</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <developers>
+        <developer>
+            <id>sdallongeville</id>
+            <name>Stéphane Dallongeville</name>
+            <url>https://research.pasteur.fr/fr/member/stephane-dallongeville/</url>
+            <roles>
+                <role>founder</role>
+                <role>lead</role>
+                <role>architect</role>
+                <role>developer</role>
+                <role>debugger</role>
+                <role>tester</role>
+                <role>maintainer</role>
+                <role>support</role>
+            </roles>
+        </developer>
+    </developers>
+
+    <!-- Project properties -->
+    <properties>
+
+    </properties>
+
+    <!-- Project build configuration -->
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <id>${project.artifactId}-fetch</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>unpack-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <includeArtifactIds>commons-collections4</includeArtifactIds>
+                            <outputDirectory>${project.build.outputDirectory}</outputDirectory>
+                            <stripVersion>true</stripVersion>
+                            <excludeTransitive>true</excludeTransitive>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <!-- List of project's dependencies -->
+    <dependencies>
+        <!-- The core of Icy -->
+        <dependency>
+            <groupId>org.bioimageanalysis.icy</groupId>
+            <artifactId>icy-kernel</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>4.4</version>
+        </dependency>
+    </dependencies>
+
+    <!-- Icy Maven repository (to find parent POM) -->
+    <repositories>
+        <repository>
+            <id>icy</id>
+            <name>Icy's Nexus</name>
+            <url>https://icy-nexus.pasteur.fr/repository/Icy/</url>
+        </repository>
+    </repositories>
+</project>
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diff --git a/src/main/java/org/apache/commons/collections4/trie/KeyAnalyzer.class b/src/main/java/org/apache/commons/collections4/trie/KeyAnalyzer.class
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diff --git a/src/main/java/org/apache/commons/collections4/trie/UnmodifiableTrie.class b/src/main/java/org/apache/commons/collections4/trie/UnmodifiableTrie.class
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diff --git a/src/main/java/org/apache/commons/collections4/trie/analyzer/StringKeyAnalyzer.class b/src/main/java/org/apache/commons/collections4/trie/analyzer/StringKeyAnalyzer.class
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diff --git a/src/main/java/plugins/stef/library/apache/ApacheCommonsCollectionsPlugin.java b/src/main/java/plugins/stef/library/apache/ApacheCommonsCollectionsPlugin.java
new file mode 100644
index 0000000000000000000000000000000000000000..0fd611fef8192cb2a50325048c4d210732448ffa
--- /dev/null
+++ b/src/main/java/plugins/stef/library/apache/ApacheCommonsCollectionsPlugin.java
@@ -0,0 +1,14 @@
+package plugins.stef.library.apache;
+
+import icy.plugin.abstract_.Plugin;
+import icy.plugin.interface_.PluginLibrary;
+
+/**
+ * Icy wrapper for the Apache Commons Collections library.
+ * 
+ * @author Stephane Dallongeville
+ */
+public class ApacheCommonsCollectionsPlugin extends Plugin implements PluginLibrary
+{
+    //
+}
diff --git a/src/main/resources/LICENSE.txt b/src/main/resources/LICENSE.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d645695673349e3947e8e5ae42332d0ac3164cd7
--- /dev/null
+++ b/src/main/resources/LICENSE.txt
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
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+   6. Trademarks. This License does not grant permission to use the trade
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+   Licensed under the Apache License, Version 2.0 (the "License");
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+   Unless required by applicable law or agreed to in writing, software
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diff --git a/src/main/resources/NOTICE.txt b/src/main/resources/NOTICE.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7f8a95f8bbfb190f6a2fe0e89e04d1f0ecedba7e
--- /dev/null
+++ b/src/main/resources/NOTICE.txt
@@ -0,0 +1,5 @@
+Apache Commons Collections
+Copyright 2001-2015 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).