Adding RichFaces libraries to an existing project is safe, and you won't see any different behavior in your existing non-RichFaces code.
In this section, we are going to discover how to integrate the RichFaces libraries manually in your projects.
The latest release of RichFaces can be downloaded as a ZIP (or
tar.gz) package from http://www.jboss.org/jbossrichfaces/downloads/ (pick the
bin version). Extract the file onto your hard drive and you're done.
You will find the lib folder inside the distribution package, which contains the library JAR files and three other documentation folders: