SONAR suggestion - generic exceptions

Replace uses of generic RuntimeException
with more appropriate unchecked exceptions

Change-Id: If283743c2cf7252b8d280bdb788708ebbe57da9d
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
index e958765..c510647 100644
--- a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/FloatingIpWebResource.java
@@ -193,10 +193,8 @@
      *
      * @param floatingIpNodes the floatingIp json node
      * @return floatingIps a collection of floatingIp
-     * @throws Exception when any argument is illegal
      */
-    public Collection<FloatingIp> changeJsonToSub(JsonNode floatingIpNodes)
-            throws Exception {
+    public Collection<FloatingIp> changeJsonToSub(JsonNode floatingIpNodes) {
         checkNotNull(floatingIpNodes, JSON_NOT_NULL);
         Map<FloatingIpId, FloatingIp> subMap = new HashMap<FloatingIpId, FloatingIp>();
         if (!floatingIpNodes.hasNonNull("id")) {