private static Map<String, String> nfvoUrlMap;
 
     static {
-        nfvoUrlMap = new HashMap<String, String>();
+        nfvoUrlMap = new HashMap<>();
         nfvoUrlMap.put(Step.CREATE, CommonConstant.NFVO_CREATE_URL);
         nfvoUrlMap.put(Step.INSTANTIATE, CommonConstant.NFVO_INSTANTIATE_URL);
         nfvoUrlMap.put(Step.TERMINATE, CommonConstant.NFVO_TERMINATE_URL);
      */
     private String getUrl(String variable, String step) {
 
-        String url = CommonConstant.STR_EMPTY;
+        String url;
         String originalUrl;
         originalUrl = (String)nfvoUrlMap.get(step);
         url = String.format(originalUrl, variable);
 
        }
 
        public void setRetryCount(int retryCount) {
-               if (retryCount < 0)
-                       retryCount = DEFAULT_RETRY_COUNT;
-               this.retryCount = retryCount;
+               int newRetryCount = retryCount;
+               if (newRetryCount < 0)
+                       newRetryCount = DEFAULT_RETRY_COUNT;
+               this.retryCount = newRetryCount;
        }
 
        public int getRetryInterval() {
        }
 
        public String getRetryList() {
-               if (retryList.size() == 0)
+               if (retryList.isEmpty())
                        return "";
                String t = retryList.toString();
                return t.substring(1, t.length()-1);
        }
 
        public void setRetryList(String retryList) {
-               Set<Integer> s = new TreeSet<Integer>();
+               Set<Integer> s = new TreeSet<>();
                for (String t : retryList.split("[, ]")) {
                        try {
                                s.add(Integer.parseInt(t));