The Apache Commons team is pleased to announce the release of commons-collections4-4.0-alpha1! Commons Collections is a project to develop and maintain collection classes based on and inspired by the JDK collection framework. Collections 4 uses the generics features of Java 5 and is not compatible with earlier JDK versions. This is the first release of Collections 4 and is being made available to encourage use and feedback from the community. The API for the final 4.0 release may change in possibly incompatible ways, thus as a consequence, this release is *not* made available via maven central, see download instructions below. Commons Collections 4.0-alpha1 requires a minimum of Java 5 to build and run. The package names and Maven artifactId and groupId (see below) have been changed to avoid any conflicts with Collections 3.x. Major changes since 3.2.1: -------------------------- - Use of generics and other language features introduced in Java 5 (varargs, Iterable) - Removed deprecated classes / methods and features which are now supported by the JDK - Replaced Buffer interface with java.util.Queue - Added concept of split maps with respective interfaces Put / Get (see also package splitmap) - Added new Trie interface together with an implementation of a Patricia Trie - Changed package name to "org.apache.commons.collections4" - Changed maven coordinates to "org.apache.commons.commons- collections4" A full list of changes compared to the previous release (v3.2.1) can be found in the release notes (text and HTML version): http://archive.apache.org/dist/commons/collections/RELEASE-NOTES.txt http://commons.apache.org/collections/release_4_0.html The release can be downloaded from the following page: http://commons.apache.org/collections/download_collections.cgi For complete information on Commons Collections 4, including instructions on how to submit bug reports, patches, or suggestions for improvement, see the Commons Collections website: http://commons.apache.org/collections/ Best regards, Thomas, on behalf of the Apache Commons community