- for (Object instance : instances) {
- INeutronNetworkAware service = (INeutronNetworkAware) instance;
- NeutronNetwork original = networkInterface.getNetwork(netUUID);
- int status = service.canUpdateNetwork(delta, original);
- if (status < 200 || status > 299) {
- return Response.status(status).build();
+ if (instances.length > 0) {
+ for (Object instance : instances) {
+ INeutronNetworkAware service = (INeutronNetworkAware) instance;
+ NeutronNetwork original = networkInterface.getNetwork(netUUID);
+ int status = service.canUpdateNetwork(delta, original);
+ if (status < 200 || status > 299) {
+ return Response.status(status).build();
+ }