final String securityRealm = req.getRealm();
final String username = req.getUsername();
final String password = req.getCredentials();
final SecurityService securityService = SystemInstance.get().getComponent(SecurityService.class);
final Object token = securityService.login(securityRealm, username, password);
final ClientMetaData client = new ClientMetaData();
client.setMetaData(metaData);
client.setClientIdentity(token);