Apache Commons

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The Apache Commons is a project of the Apache Software Foundation, formerly under the Jakarta Project. The purpose of the Commons is to provide reusable, open source Java software. The Commons is composed of three parts: proper, sandbox, and dormant.

Contents

Commons Proper

The Commons Proper is dedicated to 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 Apache projects and Apache users. Commons developers will make an effort to ensure that their components have minimal dependencies on other software 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, as well as other Apache projects, can implement these components without having to worry about changes in the future. [1]

ComponentsDescriptionLatest versionReleased
BCEL Byte Code Engineering Library - analyze, create, and manipulate Java class files6.8.22024-02-21
BeanUtils Easy-to-use wrappers around the Java reflection and introspection APIs.1.9.42019-06-12
BSFBean Scripting Framework - interface to scripting languages, including JSR-2233.12011-08-17
ChainChain of Responsibility pattern implementation.1.22008-06-01
CLICommand Line arguments parser.1.6.02023-10-23
CodecGeneral encoding/decoding algorithms (for example phonetic, base64, URL).1.16.12024-02-04
CollectionsExtends or augments the Java Collections Framework.4.5.0-M12024-03-31
CompressDefines an API for working with tar, zip and bzip2 files.1.26.12024-03-05
ConfigurationReading of configuration/preferences files in various formats.2.10.12024-03-17
CryptoA cryptographic library optimized with AES-NI wrapping Openssl or JCE algorithm implementations1.2.02023-01-14
CSVComponent for reading and writing comma separated value files.1.10.02023-01-28
DaemonA generic Daemon(unix) or Service (Windows) wrapper for Java code.1.3.42023-05-10
DBCPDatabase connection pooling services.2.12.02024-02-29
DbUtilsJDBC helper library.1.8.12023-09-09
DigesterXML-to-Java-object mapping utility.3.22011-12-13
EmailLibrary for sending e-mail from Java.1.52017-08-01
ExecAPI for dealing with external process execution and environment management in Java.1.4.02024-01-01
FileUploadFile upload capability for your servlets and web applications.1.52023-02-13
FunctorA functor is a function that can be manipulated as an object, or an object representing a single, generic function.1.0 RC12011-10-20
GeometryGeneral-purpose library for geometric processing.1.02021-08-21
ImagingA pure-Java image library.1.0-alpha42024-03-30
IOCollection of I/O utilities.2.15.12023-11-24
JCIJava Compiler Interface1.12013-10-14
JCSJava Caching System3.22023-08-22
Jelly XML based scripting and processing engine.1.0.12017-09-25
JEXLExpression language which extends the Expression Language of the JSTL.4.0-snapshot.42019-05-24
JXPathUtilities for manipulating Java Beans using the XPath syntax.1.32008-08-11
LangProvides extra functionality for classes in java.lang.3.14.02023-11-18
Logging Wrapper around a variety of logging API implementations.1.3.02023-11-26
MathLightweight, self-contained mathematics and statistics components.4.0-beta12022-12-20
NetCollection of network utilities and protocol implementations.3.10.02023-10-01
NumbersNumber types (complex, quaternion, fraction) and utilities (arrays, combinatorics).1.12022-11-01
OGNLAn Object-Graph Navigation Language4.0-incubatingTBD
PoolGeneric object pooling component.2.12.02023-09-30
ProxyLibrary for creating dynamic proxies.2.0-RC12014-04-07
RDFCommon implementation of RDF 1.1 that could be implemented by systems on the JVM.0.5.02017-12-08
RNGCommons RNG provides implementations of pseudo-random numbers generators.1.52022-09-10
SCXMLAn implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.2.0-M12014-04-03
StatisticsUtilities for statistical applications.1.02022-12-05
TextA library focused on algorithms working on strings.1.11.02023-10-24
ValidatorFramework to define validators and validation rules in an xml file.1.8.02023-12-02
VFSVirtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.2.9.02021-06-16
WeaverProvides an easy way to enhance (weave) compiled bytecode.2.02018-09-07

Commons Sandbox

The Commons Sandbox provides a workspace where Commons contributors collaborate and experiment on projects not included in the Commons Proper. Commons members champion projects in the Sandbox for promotion to the Commons Proper, and groups of developers work to enhance Sandbox projects until they meet the standards for promotion.

ComponentsDescription
BeanUtils2Redesign of Commons BeanUtils.
ClassScanFind Class interfaces, methods, fields, and annotations without loading.
CLI2Redesign of Commons CLI.
ConvertCommons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.
FinderJava library inspired by the UNIX find command.
FlatfileJava library for working with flat data structures.
GraphA general purpose Graph APIs and algorithms.
I18nAdds the feature of localized message bundles that consist of one or many localized texts that belong together.
IdId is a component used to generate identifiers.
InjectImplementation of JSR 330, a standards compliant dependency injection framework
JavaflowContinuation implementation to capture the state of the application.
JNetJNet allows using dynamically registered url stream handlers through the java.net API.
MonitoringMonitoring aims to provide a simple but extensible monitoring solution for Java applications.
NablaNabla provides automatic differentiation classes that can generate derivative of any function implemented in the Java language.
OpenPGPInterface to signing and verifying data using OpenPGP.
PerformanceA small framework for microbenchmark clients, with implementations for Commons DBCP and Pool.
PipelineProvides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects.

Commons Dormant

The Commons Dormant is a collection of components that have been declared inactive due to little recent development activity. These components may be used, but must be built yourself. It is best to assume that these components will not be released in the near future.

ComponentsDescription
AttributesRuntime API to metadata attributes such as doclet tags.
BetwixtServices for mapping JavaBeans to XML documents, and vice versa.
CacheCache provides object caching services.
ClazzClazz focuses on introspection and class manipulation.
ContractThis component makes all the nice features available to the Java programming language that come along with contract based programming.
ConvertCommons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.
DiscoveryTools for locating resources by mapping service/reference names to resource names.
ELInterpreter for the Expression Language defined by the JSP 2.0 specification.
EventsCommons-Events provides additional classes for firing and handling events. It focusses on the Java Collections Framework, providing decorators to other collections that fire events.
FeedparserA Java RSS/Atom parser designed to elegantly support all major versions of RSS and Atom, as well as easy ad hoc extension and RSS 1.0 modules capability.
JJarJakarta JAR Archive Repository
LatkaCommons-Latka is an HTTP functional testing suite for automated QA, acceptance and regression testing.
LauncherCross platform Java application launcher.
MapperMapper is a thin abstraction layer around a project's chosen data mapping technology (a.k.a. DAO pattern).
MessengerMessenger is an easy to use and lightweight framework for working with JMS in the web tier.
ModelerMechanisms to create Model MBeans compatible with JMX specification.
PrimitivesSmaller, faster and easier to work with types supporting Java primitive types.
ResourcesResources provides a lightweight framework for defining and looking up internationalized message strings keyed by a java.util.Locale and a message key.
ScaffoldScaffold is a toolkit for building web applications.
ThreadPoolThreadPool is a simple component for asynchronously dispatching work to another thread in a pool for simple multi threaded programming.
TransactionImplementations for multi level locks, transactional collections and transactional file access.
WorkflowWorkflow provides a framework for building workflow management systems.
XMLIOSimple and fast importer for XML configuration or import files.

See also

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References

Goyal, Vikram (2003), Using the Jakarta Commons, Part I , retrieved August 13, 2006

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