i0m getting a similar error... and i'm a newby.... did you manage to resolve?
I have this command to start the server:
java -cp ./lib/derbynet.jar org.apache.derby.drda.NetworkServerControl start -h localhost -p 1527
you have to cd into FloreantPOS' direactory (where the start-server.sh file is), and issue the command there.
My classpath settings seems to be a little bit different, they might work for you too.
The default .sh is in MS-DOS format. By removing the in the end of lines, the shell script will work.