Apache Commons – Apache Commons

Apache Commons – Apache Commons
Apache Commons ™
Last Published: 24 March 2026
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Welcome to Apache Commons
Apache Commons is an Apache project focused on all aspects of
reusable Java components.
The Apache Commons project is composed of three parts:
The Commons Proper
- A repository of reusable Java components.
The Commons Sandbox
- A workspace for Java component development.
The Commons Dormant
- A repository of components that are currently inactive.
You may also read our
charter
which spells out the goals of the project in greater detail.
The Apache Commons source code repositories are writable for all
ASF committers. While Apache Commons is a Commit-Then-Review community,
we would consider it polite and helpful for contributors to announce
their intentions and plans on the dev
mailing list
before committing code.
All contributors should read our
contributing
guidelines
. We accept patches as SVN diff files uploaded to the
Apache bugtracker
or as
pull request via our
github mirrors
Apache Commons Proper
Commons Proper is dedicated to one principal goal:
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 the Apache projects and
Apache users.
Commons developers will make an effort to ensure that their
components have minimal dependencies on other 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 (including other Apache projects) can implement
these components without having to worry about changes in the
future.
This
article
gives an overview of (some of) the components which can be found here.
We welcome participation from all that are interested, at all
skill levels. Coding, documentation and testing are all critical
parts of the software development process. If you are interested
in participating in any of these aspects, please join us!
Component
Description
Latest Maven Version
Release Version
Release Date
BCEL
Byte Code Engineering Library - analyze, create, and manipulate Java class files
6.12.0
2026-01-22
BeanUtils 1.X
Easy-to-use wrappers around the Java reflection and introspection APIs.
1.11.0
2025-05-27
BeanUtils 2.X
Easy-to-use wrappers around the Java reflection and introspection APIs.
2.0.0-M2
2025-05-27
BSF
Bean Scripting Framework - interface to scripting languages, including JSR-223
3.1
2010-06-24
CLI
Command Line arguments parser.
1.11.0
2025-11-12
Codec
General encoding/decoding algorithms (for example phonetic, base64, URL).
1.21.0
2026-01-29
Collections
Extends or augments the Java Collections Framework.
4.5.0
2025-04-22
Compress
Defines an API for working with tar, zip and bzip2 files.
1.28.0
2025-07-29
Configuration
Reading of configuration/preferences files in various formats.
2.13.0
2025-11-26
Crypto
A cryptographic library optimized with AES-NI wrapping Openssl or JCE algorithm implementations.
1.2.0
2023-01-23
CSV
Component for reading and writing comma separated value files.
1.14.1
2025-07-30
Daemon
Alternative invocation mechanism for unix-daemon-like java code.
1.4.1
2025-01-14
DBCP
Database connection pooling services.
2.14.0
2025-12-16
DbUtils
JDBC helper library.
1.8.1
2023-09-14
Digester
XML-to-Java-object mapping utility.
3.2
2011-12-13
Email
Library for sending e-mail from Java.
2.0.0-M1
2024-06-27
Exec
API for dealing with external process execution and environment management in Java.
1.6.0
2025-12-02
FileUpload
File upload capability for your servlets and web applications.
1.6.0
2025-06-06
FileUpload2
File upload capability for your servlets and web applications.
2.0.0-M5
2026-02-17
Geometry
Space and coordinates.
1.0
2021-08-21
Imaging (previously called Sanselan)
A pure-Java image library.
1.0.0-alpha6
2025-04-30
IO
Collection of I/O utilities.
2.21.0
2025-11-06
JCI
Java Compiler Interface
1.1
2013-10-14
JCS
Java Caching System
3.2.1
2024-05-27
Jelly
XML based scripting and processing engine.
1.0.1
2017-09-25
Jexl
Expression language which extends the Expression Language of the JSTL.
3.6.2
2026-02-09
JXPath
Utilities for manipulating Java Beans using the XPath syntax.
1.4.0
2025-04-18
Lang
Provides extra functionality for classes in java.lang.
3.20.0
2025-11-16
Logging
Wrapper around a variety of logging API implementations.
1.3.6
2026-03-08
Math
Lightweight, self-contained mathematics and statistics components.
4.0-beta1
2022-12-20
Net
Collection of network utilities and protocol implementations.
3.13.0
2026-03-18
Numbers
Number types (complex, quaternion, fraction) and utilities (arrays, combinatorics).
1.2
2024-08-12
Pool
Generic object pooling component.
2.13.1
2026-01-02
RDF
Common implementation of RDF 1.1 that could be implemented by systems on the JVM.
0.5.0
2017-12-23
RNG
Implementations of random numbers generators.
1.6
2024-07-15
SCXML
An implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.
It is capable of executing a state machine defined using a SCXML document, and abstracts out the environment interfaces.
0.9
2008-12-01
Statistics
Utilities for statistical applications.
1.2
2025-09-17
Text
Apache Commons Text is a library focused on algorithms working on strings.
1.15.0
2025-12-07
Validator
Framework to define validators and validation rules in an xml file.
1.10.1
2025-11-17
VFS
Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.
2.10.0
2025-02-14
Weaver
Provides an easy way to enhance (weave) compiled bytecode.
2.0
2018-09-07
The Commons Sandbox
The Commons project also contains a workspace that is open to all
Apache committers. It's a place to try out new ideas and prepare
for inclusion into the Commons portion of the project or into
another Apache project. Users are free to experiment with the
components developed in the sandbox, but sandbox components will
not necessarily be maintained, particularly in their current
state.
See
here
for Sandbox components.
The Commons Dormant
These are Commons components that have been deemed
inactive since they have seen little recent development activity.
If you wish to use any of these components, you must build them
yourselves. It is best to assume that these components will not be
released in the near future.
See
here
for Dormant components.
Where do I get releases?
The individual components have independent releases. Some releases
for some components may be available only through the mirroring system.
Some releases for some components (typically the older ones) are not
available through the mirroring system.
See the individual websites listed above for the specific downloads, or use the
Releases
menu option.
How do I contribute, give feedback, fix bugs and so on?
The Commons project really needs and appreciates any contributions,
including documentation help, source code and feedback.
Discussion occurs on the
Commons mailing list
Commons Proper components are all now maintained using individual
Git repositories
The code can be accessed online using GitHub (please see the links in the above listing).
Or using a Git client (links as above).
Access to the SVN
commons/sandbox
repository is available both
online
and with a
svn client
Access to the SVN
commons/dormant
repository is available both
online
and with a
svn client
Related Components @Apache
The Commons HttpClient project used to be a part of Commons, but is now part of
Apache HttpComponents
- see
Jakarta Commons HttpClient
Copyright © 2026
The Apache Software Foundation
Apache Commons, Apache, the Apache feather logo, and the Apache Commons project logos are trademarks of The Apache Software Foundation.
All other marks mentioned may be trademarks or registered trademarks of their respective owners.