This is Sun Microsystems's JSF implementation. It is product quality.
'javax.faces:jsf-impl:1.2-b19'
<dependency>
<groupId>javax.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>1.2-b19</version>
</dependency>
<dependency org="javax.faces" name="jsf-impl" rev="1.2-b19"/>
"javax.faces", "jsf-impl", "1.2-b19"