Stax2 API is an extension to basic Stax 1.0 API that adds significant new functionality, such as full-featured bi-direction validation interface and high-performance Typed Access API.

Implementation for Apache Log4J, a highly configurable logging tool that focuses on performance and low garbage generation. It has a plugin architecture that makes it extensible and supports asynchronous logging based on LMAX Disruptor.

The API for Maven 3 plugins - Mojos - development.

Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

Apache Hadoop Common

Data format extension for Jackson to offer alternative support for serializing POJOs as XML and deserializing XML as POJOs.

JAX-WS Runtime with module descriptor

Woodstox is a high-performance XML processor that implements Stax (JSR-173), SAX2 and Stax2 APIs

Maven Settings model.

Apache Solr (module: solrj)

Woodstox is a high-performance XML processor that implements Stax (JSR-173) and SAX2 APIs