Junrar adds support for reading and extracting rar.
He emerged from the old unrar library's sourceforge-host port, which is no longer available, and went to github on
https://github.com/edmund-wagner/junrar
https://github.com/junrar/junrar/
maven
<dependency>
<groupId>com.github.junrar</groupId>
<artifactId>junrar</artifactId>
<version>0.7</version>
</dependency>