Group: Apache Commons

Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

Apache Commons Compress software defines an API for working with compression and archive formats. These include: bzip2, gzip, pack200, lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

Apache Commons Text is a library focused on algorithms working on strings.

Commons-IO contains utility classes, stream implementations, file filters, and endian classes.

The Apache Commons Object Pooling Library.

Tools to assist in the reading of configuration/preferences files in various formats

The Apache Commons CSV library provides a simple interface for reading and writing CSV files of various types.

Apache Commons Exec is a library to reliably execute external processes from within the JVM.

Apache Commons DBCP software implements Database Connection Pooling

The Apache Commons JEXL library is an implementation of the JSTL Expression Language with extensions.

Apache Commons Email aims to provide an API for sending email. It is built on top of the JavaMail API, which it aims to simplify.

The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.

Apache Commons VFS is a Virtual File System library.

SpringSource Org Apache Commons Logging

The Commons Jexl library is an implementation of the JSTL Expression Language with extensions.

SpringSource Org Apache Commons Lang

SpringSource Org Apache Commons IO

The Apache Commons Digester package lets you configure an XML to Java object mapping module which triggers certain actions called rules whenever a particular pattern of nested XML elements is recognized.