SONAR Suggestion - protected members in final classes are pointless

Change-Id: Ie34d86aecf181e73867a14864d75e0db8a8f48f3
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingEntryCodec.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingEntryCodec.java
index bd69ca8..e47fb75 100644
--- a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingEntryCodec.java
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingEntryCodec.java
@@ -29,11 +29,11 @@
  */
 public final class MappingEntryCodec extends JsonCodec<MappingEntry> {
 
-    protected static final String KEY = "key";
-    protected static final String VALUE = "value";
-    protected static final String ID = "id";
-    protected static final String DEVICE_ID = "deviceId";
-    protected static final String STATE = "state";
+    static final String KEY = "key";
+    static final String VALUE = "value";
+    static final String ID = "id";
+    static final String DEVICE_ID = "deviceId";
+    static final String STATE = "state";
 
     @Override
     public ObjectNode encode(MappingEntry mappingEntry, CodecContext context) {