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Commons Lang

The standard Java libraries fail to provide enough methods formanipulation of its core classes. Apache Commons Lang providesthese extra methods.

Apache Commons Lang provides a host of helper utilities for the java.lang API, notablyString manipulation methods, basic numerical methods, object reflection, concurrency, creation and serializationand System properties. Additionally it contains basic enhancements to java.util.Date and a series of utilities dedicated to help withbuilding methods, such as hashCode, toString and equals.

Note that Commons Lang 3.0 (and subsequent versions) use a different package (org.apache.commons.lang3) than the previous versions (org.apache.commons.lang), allowing Commons Lang 3 to be used at the same time as Commons Lang 2.

Documentation

The package descriptions in theJavadoc give an overview of the available featuresand variousproject reports are provided.

The Javadoc API documents are available online:

• Thecurrent release [Java 8 and up]
• Thelegacy release 2.6 [Java 1.2 and up]
• Older releases - see theRelease History page

Thegit repository can bebrowsed, or you can browse/contribute viaGitHub.

Release Information

Read about the latest release:

• Pull it using a build tool like Maven using adependency management reference.
• Download the latest release from amirror.
• Read thechange report.
• Examine the2.x to 3.0 upgrade notes.
• Compare major versions via theLang2 to Lang3 Clirr report.

For information on previous releases see theRelease History, and to download previous releases see theCommons Lang Archive.

Getting Involved

Thecommons developer mailing list is the main channel of communication for contributors. Please remember that the lists are shared between all commons components, so prefix your email by [lang].

You can also peruseJIRA. Specific links of interest for JIRA are:

• Ideas looking for code:Patch Needed
• Issues with patches, looking for reviews:Review Patch

Alternatively you can go through theNeeds Work tags in theTagList report.

If you'd like to offer up pull requests via GitHub rather than applying patches to JIRA, we have aGitHub mirror.

Support

Thecommons mailing lists act as the main support forum.The user list is suitable for most library usage queries.The dev list is intended for the development discussion.Please remember that the lists are shared between all commons components,so prefix your email by [lang].

Bug reports and enhancements are also welcomed via theJIRA issue tracker.Please read the instructions carefully.