diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/Subnet.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/Subnet.java
index ca3fce8..f563a78 100644
--- a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/Subnet.java
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/Subnet.java
@@ -27,7 +27,7 @@
     /**
      * Coarse classification of the type of the ipV6Mode.
      */
-    public enum Mode {
+    enum Mode {
         DHCPV6_STATEFUL, DHCPV6_STATELESS, SLAAC
     }
 
diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/TenantNetwork.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/TenantNetwork.java
index 5118ece..256352f 100644
--- a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/TenantNetwork.java
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/TenantNetwork.java
@@ -23,7 +23,7 @@
     /**
      * Coarse classification of the state of the tenantNetwork.
      */
-    public enum State {
+    enum State {
         /**
          * Signifies that a tenantNetwork is currently active.This state means
          * that this network is available.
@@ -46,7 +46,7 @@
     /**
      * Coarse classification of the type of the tenantNetwork.
      */
-    public enum Type {
+    enum Type {
         /**
          * Signifies that a tenantNetwork is local.
          */
diff --git a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/VirtualPort.java b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/VirtualPort.java
index 7886224..d2d7c14 100644
--- a/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/VirtualPort.java
+++ b/apps/vtnrsc/src/main/java/org/onosproject/vtnrsc/VirtualPort.java
@@ -28,7 +28,7 @@
     /**
      * Coarse classification of the type of the virtual port.
      */
-    public enum State {
+    enum State {
         /**
          * Signifies that a virtualPort is currently active,This state mean that
          * this virtualPort is available.
@@ -37,7 +37,7 @@
         /**
          * Signifies that a virtualPort is currently unavailable.
          */
-        DOWN
+        DOWN;
     }
 
     /**