Github user jburwell commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/801#discussion_r43050493
  
    --- Diff: 
plugins/network-elements/nuage-vsp/src/com/cloud/network/manager/NuageVspManagerImpl.java
 ---
    @@ -152,50 +241,185 @@ public NuageVspDeviceVO 
addNuageVspDevice(AddNuageVspDeviceCmd cmd) {
                 throw new CloudRuntimeException("A NuageVsp device is already 
configured on this physical network");
             }
     
    -        Map<String, String> params = new HashMap<String, String>();
    -        params.put("guid", UUID.randomUUID().toString());
    -        params.put("zoneId", 
String.valueOf(physicalNetwork.getDataCenterId()));
    -        params.put("physicalNetworkId", 
String.valueOf(physicalNetwork.getId()));
    -        params.put("name", "Nuage VSD - " + cmd.getHostName());
    -        params.put("hostname", cmd.getHostName());
    -        params.put("cmsuser", cmd.getUserName());
    -        String cmsUserPasswordBase64 = 
org.apache.commons.codec.binary.StringUtils.newStringUtf8(Base64.encodeBase64(cmd.getPassword().getBytes(Charset.forName("UTF-8"))));
    -        params.put("cmsuserpass", cmsUserPasswordBase64);
    -        int port = cmd.getPort();
    -        if (0 == port) {
    -            port = 443;
    -        }
    -        params.put("port", String.valueOf(port));
    -        params.put("apirelativepath", "/nuage/api/" + cmd.getApiVersion());
    -        params.put("retrycount", String.valueOf(cmd.getApiRetryCount()));
    -        params.put("retryinterval", 
String.valueOf(cmd.getApiRetryInterval()));
    +        try {
    +            NuageVspPluginClientLoader clientLoader = 
NuageVspPluginClientLoader.getClientLoader(null, null, 1, 1, null);
     
    -        Map<String, Object> hostdetails = new HashMap<String, Object>();
    -        hostdetails.putAll(params);
    +            Map<String, Object> clientDefaults = 
clientLoader.getNuageVspManagerClient().getClientDefaults();
    +            String apiVersion = 
MoreObjects.firstNonNull(cmd.getApiVersion(), (String) 
clientDefaults.get("CURRENT_API_VERSION"));
    +            if 
(!clientLoader.getNuageVspManagerClient().isSupportedApiVersion(apiVersion)) {
    +                throw new CloudRuntimeException("Unsupported API version : 
" + apiVersion);
    +            }
     
    -        try {
    +            Map<String, String> params = new HashMap<String, String>();
    +            params.put("guid", UUID.randomUUID().toString());
    +            params.put("zoneId", 
String.valueOf(physicalNetwork.getDataCenterId()));
    +            params.put("physicalNetworkId", 
String.valueOf(physicalNetwork.getId()));
    +            params.put("name", "Nuage VSD - " + cmd.getHostName());
    +            params.put("hostname", cmd.getHostName());
    +            params.put("cmsuser", cmd.getUserName());
    +            String cmsUserPasswordBase64 = 
org.apache.commons.codec.binary.StringUtils.newStringUtf8(Base64.encodeBase64(cmd.getPassword().getBytes()));
    +            params.put("cmsuserpass", cmsUserPasswordBase64);
    +            int port = cmd.getPort();
    +            if (0 == port) {
    +                port = 8443;
    +            }
    +            params.put("port", String.valueOf(port));
    +            params.put("apiversion", apiVersion);
    +            params.put("apirelativepath", "/nuage/api/" + apiVersion);
    +            params.put("retrycount", 
String.valueOf(MoreObjects.firstNonNull(cmd.getApiRetryCount(), 
clientDefaults.get("DEFAULT_API_RETRY_COUNT"))));
    +            params.put("retryinterval", 
String.valueOf(MoreObjects.firstNonNull(cmd.getApiRetryInterval(), 
clientDefaults.get("DEFAULT_API_RETRY_INTERVAL"))));
    +
    +            final Map<String, Object> hostdetails = new HashMap<String, 
Object>();
    +            hostdetails.putAll(params);
                 resource.configure(cmd.getHostName(), hostdetails);
     
    -            final Host host = _resourceMgr.addHost(zoneId, resource, 
Host.Type.L2Networking, params);
    +            Host host = _resourceMgr.addHost(zoneId, resource, 
Host.Type.L2Networking, params);
                 if (host != null) {
    --- End diff --
    
    Simply this block by checking if the host is ``null`` throwing an exception 
before proceeding further in the method.


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