Struts Action Framework 2 is at a pre-release, pre-Alpha stage. Not everything is going to work, day to day. If you are just getting started with Action2/WebWork2, we recommend WebWork 2.2 as an entry point. WW2 is stable and production ready. When SAF2 is released, migration paths for WW2 and SAF1 developers will be available. See the SAF 2 release plan for details and status.
We're in the process of migrating this wiki from Open Symphony WebWork2 to Struts Action Framework 2. WebWork is in the process of joining the Apache Struts project. See our incubator page for details. During the migration period, references to WebWork2 and SAF2 will be intermixed.