| Components | Description | Latest version | Released |
| BCEL | Byte Code Engineering Library - analyze, create, and manipulate Java class files | 6.12.0 | 2026-01-18 |
| BeanUtils | Easy-to-use wrappers around the Java reflection and introspection APIs | 1.11.0 | 2025-05-25 |
| BSF | Bean Scripting Framework - interface to scripting languages, including JSR-223 | 3.1 | 2011-08-17 |
| Chain | Chain of Responsibility pattern implementation | 1.2 | 2008-06-01 |
| CLI | Command Line arguments parser | 1.11.0 | 2025-11-08 |
| Codec | General encoding/decoding algorithms | 1.19.0 | 2025-07-19 |
| Collections | Extends or augments the Java Collections Framework | 4.5.0 | 2025-04-19 |
| Compress | Defines an API for working with TAR, ZIP and BZIP2 files | 1.28.0 | 2025-07-26 |
| Configuration | Reading of configuration/preferences files in various formats | 2.13.0 | 2025-11-21 |
| Crypto | Cryptographic library optimized with AES-NI wrapping OpenSSL or JCE algorithm implementations | 1.2.0 | 2023-01-14 |
| CSV | Component for reading and writing comma separated value files | 1.14.0 | 2025-03-15 |
| Daemon | Generic Daemon (unix) or Service (Windows) wrapper for Java code | 1.5.1 | 2025-12-16 |
| DBCP | Database connection pooling services | 2.14.0 | 2025-12-11 |
| DbUtils | JDBC helper library | 1.8.1 | 2023-09-09 |
| Digester | XML-to-Java-object mapping utility | 3.2 | 2011-12-13 |
| Email | Library for sending e-mails | 1.5 | 2017-08-01 |
| Exec | API for dealing with external process execution and environment management | 1.6.0 | 2025-11-25 |
| FileUpload | File upload capability for servlets and web applications | 1.6.0 | 2025-06-05 |
| Functor | Supports functional programming using functors, objects representing functions | 1.0 RC1 | 2011-10-20 |
| Geometry | General-purpose library for geometric processing | 1.0 | 2021-08-21 |
| Imaging | Pure-Java image library | 1.0-alpha6 | 2025-04-27 |
| IO | Collection of I/O utilities | 2.21.0 | 2025-11-04 |
| 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 | 3.6.0 | 2025-11-10 |
| JXPath | Utilities for manipulating Java Beans using the XPath syntax | 1.4.0 | 2025-04-12 |
| Lang | Provides extra functionality for classes in java.lang | 3.20.0 | 2025-11-12 |
| Logging | Wrapper around a variety of logging API implementations | 1.3.5 | 2025-01-31 |
| Math | Lightweight, self-contained mathematics and statistics components | 4.0-beta1 | 2022-12-20 |
| Net | Collection of network utilities and protocol implementations | 3.12.0 | 2025-07-28 |
| Numbers | Number types and utilities | 1.2 | 2024-08-12 |
| Pool | Generic object pooling component | 2.13.1 | 2025-12-30 |
| Proxy | Library for creating dynamic proxies | 2.0-RC1 | 2014-04-07 |
| RDF | Common implementation of RDF 1.1 that could be implemented by systems on the JVM | 0.5.0 | 2017-12-08 |
| RNG | Implementions of pseudo-random numbers generators | 1.6 | 2024-07-15 |
| SCXML | Implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine | 2.0-M1 | 2014-04-03 |
| Statistics | Utilities for statistical applications | 1.2 | 2025-09-17 |
| Text | Library focused on algorithms working on strings | 1.15.0 | 2025-12-04 |
| Validator | Framework to define validators and validation rules in an XML file | 1.10.1 | 2025-11-14 |
| VFS | Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system | 2.10.0 | 2025-02-01 |
| Weaver | Provides an easy way to enhance compiled bytecode | 2.0 | 2018-09-07 |
| Components | Description |
| BeanUtils2 | Redesign of Commons BeanUtils |
| ClassScan | Find Class interfaces, methods, fields, and annotations without loading |
| CLI2 | Redesign of Commons CLI |
| Convert | Aims to provide a single library dedicated to the task of converting an object of one type to another |
| Finder | Java library inspired by the UNIX find command |
| Flatfile | Java library for working with flat data structures |
| Graph | General purpose Graph APIs and algorithms |
| I18n | Adds the feature of localized message bundles that consist of one or many localized texts that belong together |
| Id | Component for generating identifiers |
| Inject | Implementation of JSR 330, a standards compliant dependency injection framework |
| Javaflow | Continuation implementation to capture the state of the application |
| JNet | Allows using dynamically registered URL stream handlers through the java.net API |
| Monitoring | Aims to provide a simple but extensible monitoring solution for Java applications |
| Nabla | Provides automatic differentiation classes that can generate derivative of any function implemented in the Java language |
| OpenPGP | Interface to signing and verifying data using OpenPGP |
| Performance | Small framework for microbenchmark clients, with implementations for Commons DBCP and Pool |
| Pipeline | Provides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects |
| Components | Description |
| Attributes | Runtime API to metadata attributes such as doclet tags |
| Betwixt | Services for mapping JavaBeans to XML documents and vice versa |
| Cache | Provides object caching services |
| Clazz | Focuses on introspection and class manipulation |
| Contract | Component for making features that come along with contract based programming available |
| Convert | Aims to provide a single library dedicated to the task of converting an object of one type to another |
| Discovery | Tools for locating resources by mapping service/reference names to resource names |
| EL | Interpreter for the Expression Language defined by the JSP 2.0 specification |
| Events | Provides additional classes for firing and handling events. It focuses on the Java Collections Framework, providing decorators to other collections that fire events. |
| Feedparser | RSS and Atom parser designed to support all major versions of RSS and Atom, as well as easy ad hoc extension and RSS 1.0 modules capability |
| JJar | Jakarta JAR Archive Repository |
| Latka | HTTP functional testing suite for automated QA, acceptance and regression testing |
| Launcher | Cross platform Java application launcher |
| Mapper | Thin abstraction layer around a project's chosen data mapping technology |
| Messenger | Easy to use and lightweight framework for working with JMS in the web tier |
| Modeler | Mechanisms to create Model MBeans compatible with JMX specification |
| OGNL | Object-Graph Navigation Language |
| Primitives | Smaller, faster and easier to work with types supporting Java primitive types |
| Resources | Provides a lightweight framework for defining and looking up internationalized message strings keyed by a java.util.Locale and a message key |
| Scaffold | Toolkit for building web applications |
| ThreadPool | Simple component for asynchronously dispatching work to another thread in a pool for simple multithreaded programming |
| Transaction | Implementations for multi-level locks, transactional collections and transactional file access |
| Workflow | Provides a framework for building workflow management systems |
| XMLIO | Simple and fast importer for XML configuration or import files |