Welcome to the

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Apache Commons Wiki

This is the \[http://jakarta.apache.org/commons Jakarta Commons\] wiki. We're a Jakarta community, dedicated to creating of reusable library components in Java. 

JakartaCommonsEtiquette contains observations and opinions aimed at explaining some of the peculiarities of Jakarta Commons.

We're a Commons community, dedicated to creating reusable library components in Java. Apache Commons mainly uses Subversion as its version control system, however some components now use Git, and Commons components are available as read-only mirrors on Github.

Welcome: CommonsEtiquette | CommonsResources | ArticlesAndTutorials

Developers: GettingInvolved | UsingGIT | UsingSVN | CodeStyle | UseClirrWithShade

Committers: CommonsPeople | ComponentPlans | CommonsCommitters | CommonsOsgi | UsingNexus | CommonsGroupids | Maven3Plan

Bug Reports: Jira

Security Reports: Security Wiki Markup*Note:* We are currently moving from the \[http://nagoya.apache.org/wiki/apachewiki.cgi?JakartaCommonsProjectPages old wiki\] to this new location. Update your bookmarks!

Components

On this wiki:

• BeanUtils - Utilities for manipulating java beans, including copying properties, cloning, invoking methods and type conversion.
• Betwixt - Services for mapping JavaBeans to XML documents, and vice versa.
• Chain - A "Chain of Responsibility" pattern implemention for organizing complex processing flows.
• CLI - Command Line Interface library for processing command-line options and arguments.
• Codec - General encoding/decoding algorithms. Includes some phonetic encoders, Hex, Base64, and a URL encoder.
• Collections - Builds upon the Java Collections Framework of List, Set and Map to provide many more implementations, new collections and abstract base classes.
• Configuration - Tools to assist in the reading of configuration/preferences files in various formats
• Compress - Defines an API for working with archives and compression formats including but not limited to: tar,gz, ar, cpio, zip and bzip2 files
• Daemon - Run (java) applications as windows service or UNIX daemon.
• DBCP - Database connection pooling services.
• Digester - An

• Wiki Markup
  \[:Betwixt\] - Betwixt provides services for mapping [JavaBeans] to XML documents, and vice versa.

• Wiki Markup
  \[:Codec\] - Codec contains some general encoding/decoding algorithms. Includes some phonetic encoders, Hex, Base64, and a URL encoder.

• Wiki Markup
  \[:Collections\] - Collections builds upon the Java Collections Framework of List, Set and Map to provide many more implementations, new collections and abstract base classes.

• Wiki Markup
  \[:DBCP\] - DBCP provides database connection pooling services.

• Wiki Markup\[:Digester\] - Digester is an XML-to-Java-object mapping utility commonly used for parsing XML configuration files.

• Wiki Markup
  \[:HttpClient\] - [HttpClient] provides a framework for working with the client-side of the HTTP protocol.

• Wiki Markup
  \[:Lang\] - Lang provides a set of common utilities that should be provided by the JDK, including String handling, Object and Date helpers, nested exceptions and enumerated types.

• Wiki Markup
  \[:Net\] - Net is a a collection of network utilities, based on the [NetComponents] codebase, including FTP clients etc.

• Wiki Markup
  \[:Pool\] - Pool provides a generic object pooling interface, a toolkit for creating modular object pools and several general purpose pool implementations.

• Email - Simplify email sending with Java. Built on top of the Java Mail API.
• Exec - A Java library to execute external processes from within a Java application
• FileUpload - Makes it easy to add robust, high-performance, file upload capability to your servlets and web applications
• Functor - Supports functional programming in Java
• HttpClient - A framework for working with the client-side of the HTTP protocol.
• IO - Utility classes, stream implementations, file filters and endian classes to assist in input/output operations.
• JCI - Java Compiler Interface
• JEXL - A velocity-esque expression interpreter
• Jelly - An XML-based scripting language
• JXPath - Facilities for applying xpath expressions to graphs of objects of all kinds: Java beans, Maps, Servlet contexts, DOM etc.
• Lang - Common utilities that should be provided by the JDK, including String handling, Object and Date helpers, nested exceptions and enumerated types.
• Launcher - A cross platform Java application launcher which eliminates the need for a batch or shell script to launch a Java class.
• Logging A thin, modular bridging API with out-of-the-box support for the most well known logging systems.
• Math Lightweight, self-contained mathematics and statistics components.
• Modeler Mechanisms to create Model MBeans compatible with the Java Management Extensions (JMX) specification.
• Net - A collection of classes implementing various network protocols such as FTP, NNTP, SMTP, Telnet.
• Pool - A generic object pooling interface, a toolkit for creating modular object pools and several general purpose pool implementations.
• Proxy - A Java library for dynamic proxying
• SCXML - A Java implementation of State Chart XML (SCXML), currently a W3C Working Draft.
• Transaction - Utility classes commonly used in transactional programming
• Validator - Components for user input validation
• VFS - Extensible framework to acces various filesystems through an unified api with implementations for e.g. sftp, smb, http, zip, ... Wiki Markup\[:Validator\] - Validator provides components for user input validation \\ \\
  
  

On the commons site:

• http://jakartacommons.apache.org/commons/components.html
  
  

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Sandbox

TheSandbox is an open workspace for jakarta Apache committers. This is also divided into components.

Components

On this wiki:

• ResourcesProjectPages
  

Other Documentation

• MovingFromSandboxToProper
  
• CreatingStandardWebPresence
  
• GettingInvloved - General Documentation for all Apache Commiters and ReleaseManager concerning various subjects (like SigningReleases, MavenRepository, and Mirroring)
  

Third Party Resources

• Wiki Markup
  \[http://www.java201.com/resources/browse/70-all.html Jakarta Commons Resources\] \\

*Q:* Little request: Can we PLEASE have a single javadoc tree for all commons components?  
I am getting tired of switching between dbcp, loggin, and pool.  
Especially when I am following one line of calls or inheritance.  
Thanks, Angus

*A:* Sure, it should be relatively easy, why not take some initiative and do it yourself?

'Special' Wiki pages

TitleIndex
A list of all pages on this wiki.

HelpContents
A basic guide to the MoinMoin wiki (including information about wiki syntax).

WordIndex
A list of all the words that appear in the titles of the pages on this wiki, with links to pages that include that word.

FindPage
A full-text search of the wiki.

WantedPages
All the "broken links" – a list of all the pages on this wiki that are linked to, but do not exist.

OrphanedPages
All pages on this wiki that are not linked to from anywhere else (and are thus very hard to reach).

RandomPage
Generates a list of 75 random pages on this wiki.

PageSize
Generates a graph and some statistics about the sizes of pages on this wiki.

EventStats/HitCounts
Generates a graph of page views and page visits.

EventStats/UserAgents
Generates a graph of the web browsers used in visiting this page.

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• ClassScan - Read access to the ClassPath of a ClassLoader and metadata about the classes available from a ClassLoader.
• CLI2 - An experimental rewrite of the Commons CLI API
• CommonsCsv - Proposed new component
• Id - Generators for identifiers
• ME - Provides JaveME helpers, and implementations of JavaSE functionality that JavaME lacks but programmers want
• Metadata - Proposed new component which provides a class metadata API similar to that of JDK5
  
  

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Dormant

Sandbox components that are currently inactive. On this wiki:

• CommonsConvert - Various conversion ideas extracted from BeanUtils
• FeedParser - RSS and Atom parsing infrastructure
• Resources - A lightweight framework for defining and looking up internationalized message strings.