if (securityManager.listUserGroupServices().contains(serviceName)) {
GeoServerUserGroupService service = securityManager.loadUserGroupService(serviceName);
if (service.canCreateStore()) {
GeoServerUserGroupStore store = service.createStore();
store.clear();
store.store();
}
SecurityUserGroupServiceConfig old =
securityManager.loadUserGroupServiceConfig(serviceName);
securityManager.removeUserGroupService(old);