As per:https://groups.google.com/forum/?fromgroups#!topic/ebean/3TTf9PPF0_Y
http://www.postgresql.org/docs/8.1/static/datatype.html#DATATYPE-SERIAL
Currently there is not a nice way to get Ebean to support postgres SERIAL and it would be nice if it did so easily - perhaps even as the default behaviour for Postgres.