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Created by
ASF Infrabot
, last modified by
Sebb
on
Mar 21, 2025
We're the
Commons
community, dedicated to creating reusable library components in Java.
Apache Commons mainly uses
Git
as the version control system
and Commons components are available as read-only mirrors on
Github
Welcome:
CommonsEtiquette
CommonsResources
ArticlesAndTutorials
Developers:
GettingInvolved
UsingSVN
UsingGIT
CodeStyle
MovingToGit
UseClirrWithShade
Committers:
CommonsPeople
ComponentPlans
CommonsCommitters
CommonsOsgi
UsingNexus
CommonsGroupids
Maven3Plan
Bug Reports:
Jira
Security Reports:
Security
Components
Components are subprojects of Commons. Every component provides, and maintains one or more jar files, building a library. We distinguish components
by maturity status:
Proper
(Mature, Releases available),
Sandbox
(Immature, never released), and
Dormant
(No longer active, unmaintained).
Name
Status
Description
BeanUtils
Proper
Utilities for manipulating java beans, including copying properties, cloning, invoking methods and type conversion.
Betwixt
Dormant
Services for mapping JavaBeans to XML documents, and vice versa.
Chain
Proper
A "Chain of Responsibility" pattern implemention for organizing complex processing flows.
CLI
Proper
Command Line Interface library for processing command-line options and arguments.
Codec
Proper
General encoding/decoding algorithms. Includes some phonetic encoders, Hex, Base64, and a URL encoder.
Collections
Proper
Builds upon the Java Collections Framework of List, Set and Map to provide many more implementations, new collections and abstract base classes.
Configuration
Proper
Tools to assist in the reading of configuration/preferences files in various formats
Compress
Proper
Defines an API for working with archives and compression formats including but not limited to: tar,gz, ar, cpio, zip and bzip2 files
Daemon
Proper
Run (java) applications as windows service or UNIX daemon.
DBCP
Proper
Database connection pooling services.
Digester
Proper
XML-to-Java-object mapping utility.
Email
Proper
Simplify email sending with Java. Built on top of the Java Mail API.
Exec
Proper
A Java library to execute external processes from within a Java application.
FileUpload
Proper
Makes it easy to add robust, high-performance, file upload capability to your servlets and web applications
Functor
Proper
A functor is a function that can be manipulated as an object, or an object representing a single, generic function.
IO
Proper
Utility classes, stream implementations, file filters and endian classes to assist in input/output operations.
JCI
Proper
Java Compiler Interface
JCS
Proper
Java Caching System
JEXL
Proper
A velocity-esque expression interpreter
Jelly
Proper
An XML-based scripting language.
JXPath
Proper
Facilities for applying xpath expressions to graphs of objects of all kinds: Java beans, Maps, Servlet contexts, DOM etc.
Lang
Proper
Common utilities that should be provided by the JDK, including String handling, Object and Date helpers, nested exceptions and enumerated types.
Launcher
Dormant
A cross platform Java application launcher which eliminates the need for a batch or shell script to launch a Java class.
Logging
Proper
A thin, modular bridging API with out-of-the-box support for the most well known logging systems.
Math
Proper
Lightweight, self-contained mathematics and statistics components.
Modeler
Dormant
Mechanisms to create Model MBeans compatible with JMX specification.
Net
Proper
A collection of classes implementing various network protocols such as FTP, NNTP, SMTP, Telnet.
Pool
Proper
A generic object pooling interface, a toolkit for creating modular object pools and several general purpose pool implementations.
Proxy
Proper
A Java library for dynamic proxying
SCXML
Proper
A Java implementation of State Chart XML (SCXML), currently a W3C Working Draft.
Transaction
Dormant
Utility classes commonly used in transactional programming
Validator
Proper
Components for user input validation
VFS
Proper
Extensible framework to access various filesystems through an unified api with implementations for e.g. sftp, smb, http, zip, ...
Elsewhere at Apache ...
The following components were part of Apache Commons but have moved elsewhere:
Cactus
: Cactus is a simple test framework for unit testing server-side java code (Servlets, EJBs, Tag Libs, Filters, ...). The intent of Cactus is to lower the cost of writing tests for server-side code.
Hivemind
: HiveMind is a services and configuration microkernel. HiveMind allows you to create your application using a service oriented architecture.
HttpClient 3.x
: Framework for working with the client-side of the HTTP protocol.
Naming
: The Naming subproject will contain common JNDI code along with various JNDI providers.
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