Apache Commons

Welcome to the Apache Commons

The 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 Commons Proper

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The 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!

 

Components
CLI	Command Line arguments parser.
Codec	General encoding/decoding algorithms (for example phonetic, base64, URL).
Collections	Extends or augments the Java Collections Framework.
Compress	Defines an API for working with tar, zip and bzip2 files.
Configuration	Reading of configuration/preferences files in various formats.
DBCP	Database connection pooling services.
DbUtils	JDBC helper library.
Email	Library for sending e-mail from Java.
Exec	API for dealing with external process execution and environment management in Java.
FileUpload	File upload capability for your servlets and web applications.
Functor	A functor is a function that can be manipulated as an object, or an object representing a single, generic function.
Imaging (previously called Sanselan)	A pure-Java image library.
IO	Collection of I/O utilities.
JCI	Java Compiler Interface
JCS	Java Caching System
Lang	Provides extra functionality for classes in java.lang.
Launcher	Cross platform Java application launcher.
Logging	Wrapper around a variety of logging API implementations.
Math	Lightweight, self-contained mathematics and statistics components.
Pool	Generic object pooling component.
Sanselan (now called Imaging)	A pure-Java image library.