If you want to try out the simpsons-sample copy simpsons-data.xml over existing data.xml file or change the following configuration entry in rapla.xconf:

  <file-storage id="file">
    <file>simpsons-data.xml</file>
    <validate>no</validate>
  </file-storage>

Some Logins for the [Server Installation] are (The empty-login also works)

User:	Password:	Roles:
lisa	lisa
admin	donut
homer	duffs	(Admin)
skinner	edna
monty	money	(Admin)
abe	matlock