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The Apache Commons is a project of the Apache Software Foundation, formerly under the Jakarta Project. The purpose of the Commons is to provide reusable, open source Java software. The Commons is composed of three parts: proper, sandbox, and dormant.
Commons Proper
The Commons Proper is dedicated to creating and maintaining reusable Java components. The Commons Proper is a place for collaboration and sharing, where developers from throughout the Apache community can work together on projects to be shared by Apache projects and Apache users. Commons developers will make an effort to ensure that their components have minimal dependencies on other software libraries, so that these components can be deployed easily. In addition, Commons components will keep their interfaces as stable as possible, so that Apache users, as well as other Apache projects, can implement these components without having to worry about changes in the future.[1]
| Components | Description | Latest Version | Released |
|---|---|---|---|
| BCEL | Byte Code Engineering Library - analyze, create, and manipulate Java class files | 5.2 | 2007-06-14 |
| BeanUtils | Easy-to-use wrappers around the Java reflection and introspection APIs. | 1.9.2 | 2014-05-29 |
| BSF | Bean Scripting Framework - interface to scripting languages, including JSR-223 | 3.1 | 2010-24-06 |
| Chain | Chain of Responsibility pattern implemention. | 1.2 | 2008-06-02 |
| CLI | Command Line arguments parser. | 1.2 | 2009-03-19 |
| Codec | General encoding/decoding algorithms (for example phonetic, base64, URL). | 1.9 | 2013-12-25 |
| Collections | Extends or augments the Java Collections Framework. | 4.0 | 2013-11-24 |
| Compress | Defines an API for working with tar, zip and bzip2 files. | 1.8.1 | 2014-05-14 |
| Configuration | Reading of configuration/preferences files in various formats. | 1.10 | 2013-10-27 |
| CSV | Component for reading and writing comma separated value files. | 1.0 | 2014-08-14 |
| Daemon | Alternative invocation mechanism for unix-daemon-like java code. | 1.0.15 | 2013-03-04 |
| DBCP | Database connection pooling services. | 2.0.1 | 2014-05-24 |
| DbUtils | JDBC helper library. | 1.6 | 2014-07-20 |
| Digester | XML-to-Java-object mapping utility. | 3.2 | 2011-12-13 |
| Discovery | Tools for locating resources by mapping service/reference names to resource names. | 0.5 | 2011-04-28 |
| EL | Interpreter for the Expression Language defined by the JSP 2.0 specification. | 1.0 | 2003-06-18 |
| Library for sending e-mail from Java. | 1.3.3 | 2014-07-11 | |
| Exec | API for dealing with external process execution and environment management in Java. | 1.2 | 2014-01-02 |
| FileUpload | File upload capability for your servlets and web applications. | 1.3.1 | 2014-02-07 |
| Functor | A functor is a function that can be manipulated as an object, or an object representing a single, generic function. | N/A | N/A |
| Imaging | A pure-Java image library. | N/A | N/A |
| IO | Collection of I/O utilities. | 2.4 | 2012-06-12 |
| JCI | Java Compiler Interface | 1.1 | 2013-10-14 |
| JCS | Java Caching System | 1.3 | 2007-06-05 |
| Jelly | XML based scripting and processing engine. | 1.0 | 2005-06-16 |
| Jexl | Expression language which extends the Expression Language of the JSTL. | 2.1.1 | 2011-12-24 |
| JXPath | Utilities for manipulating Java Beans using the XPath syntax. | 1.3 | 2008-08-14 |
| Lang | Provides extra functionality for classes in java.lang. | 3.3.2 | 2014-04-09 |
| Launcher | Cross platform Java application launcher. | 1.1 | 2004-08-22 |
| Logging | Wrapper around a variety of logging API implementations. | 1.2 | 2014-07-11 |
| Math | Lightweight, self-contained mathematics and statistics components. | 3.3 | 2014-05-14 |
| Modeler | Mechanisms to create Model MBeans compatible with JMX specification. | 2.0.1 | 2007-06-25 |
| Net | Collection of network utilities and protocol implementations. | 3.3 | 2013-06-12 |
| OGNL | An Object-Graph Navigation Language | N/A | N/A |
| Pool | Generic object pooling component. | 2.2 | 2014-02-24 |
| Primitives | Smaller, faster and easier to work with types supporting Java primitive types. | 1.0 | 2003-11-05 |
| Proxy | Library for creating dynamic proxies. | 1.0 | 2008-02-28 |
| SCXML | An implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine. | 0.9 | 2008-12-01 |
| Validator | Framework to define validators and validation rules in an xml file. | 1.4.0 | 2012-02-03 |
| VFS | Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system. | 2.0 | 2011-08-24 |
| Weaver | Provides an easy way to enhance (weave) compiled bytecode. | 1.0 | 2014-03-16 |
Commons Sandbox
The Commons Sandbox provides a workspace where Commons contributors collaborate and experiment on projects not included in the Commons Proper. Commons members champion projects in the Sandbox for promotion to the Commons Proper, and groups of developers work to enhance Sandbox projects until they meet the standards for promotion.
A list of Commons Sandbox projects appears on the Commons Sandbox page.
Commons Dormant
The Commons Dormant is a collection of components that have been declared inactive due to little recent development activity. These components may be used, but must be built yourself. It is best to assume that these components will not be released in the near future.
The current list of Commons Dormant projects is available on the Commons Dormant page.
See also
References
Goyal, Vikram (2003), Using the Jakarta Commons, Part I, retrieved August 13, 2006