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- 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 XML-to-Java-object mapping utility commonly used for parsing XML configuration files.
- 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, ...
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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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- 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.
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