A complete Viewer + DAT + functional php backend code setup can be created in a few simple steps. What you'll need:
1.) Download and install docker here
2.) Get the experimental a2j-docker environment here
3.) navigate to the a2j-docker environment
4.) in a terminal run docker-compose up --build
5.) in a browser navigate to localhost:53080/a2j-viewer/viewer
6.) run the default interview