This email list is used for those working on the next release of Geoserver. For discussion and troubleshooting please visit our user list.
Community modules are a work-in-progress shared publicly for collaboration, and are best experienced as source code.
Please start by checking out the source code and running the gs-spatialite tests.
Because community modules are not ready to be included in GeoServer yet we do not run tests on them automatically, so your help trying it out is appreciated.
I also note the implementation (in the geotools library) has some more instructions here: