Using Extensions
Extensions are a way to add libraries to Core Classloader.
Extensions are typically used to enable Wagon providers, used for the transport of artifact between repositories, and plug-ins which provide lifecycle enhancements.
Wagon providers
<project> ... <build> <extensions> <extension> <groupId>org.apache.maven.wagon</groupId> <artifactId>wagon-ftp</artifactId> <version>2.10</version> </extension> </extensions> </build> ... </project>
Plug-ins which provide lifecycle enhancements
<project> ... <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <extensions>true</extensions> <configuration> ... </configuration> </plugin> </plugins> </build> ... </project>