Mojarra 2.2.8-xx releases are created specifically for Oracle WebLogic 12c with patches from the new versions supported each time. WebLogic is a bug in the integrated version of Weld that made it incompatible with Mojarra 2.2.9 and later, where a fix for issue 3345 was introduced.
If you are not using WebLogic 12c, just ignore the 2.2.8-xx versions and choose the newest 2.2.x, which is currently 2.2.14. If you are using WebLogic 12c, then you should focus on getting a service pack from Oracle WebLogic support. It will combine the new version of Mojarra 2.2.8-xx.
By reference: I am the Commander of Mojarra and JSF 2.3 is a member of EG .
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