protected Object doExecute() throws Exception {
getInstanceService().refreshInstance();
Instance[] instances = getInstanceService().getInstances();
ShellTable table = new ShellTable();
table.column("SSH Port").alignRight();
table.column("RMI Registry").alignRight();
table.column("RMI Server").alignRight();
table.column("State");
table.column("PID");
table.column(getRightColumnHeader());
for (Instance instance : instances) {