Click on 'CONNECT' tab, right click on 'Database' and select 'Create derby server connection'
cm set "demo_cm_derby_server" {execute "db.derby.server.config.get" "[hostname]" "localhost, 127.0.0.1" "[port]" "1527" "[database]" "demo/db/derby/test_db" "[user]" "sa" "[password]" "sa" ;};
"1"Click on refrech button: