diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbApplicationService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbApplicationService.java
index bce4406..7ec8ed1 100644
--- a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbApplicationService.java
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbApplicationService.java
@@ -59,7 +59,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ApplicationService applicationService;
 
-    private static ApplicationServiceNbServerInternal instance = null;
+    private ApplicationServiceNbServerInternal instance = null;
 
 
     @Activate
diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbComponentConfigService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbComponentConfigService.java
index 8e0c2dd..673d126 100644
--- a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbComponentConfigService.java
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbComponentConfigService.java
@@ -62,7 +62,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ComponentConfigService componentConfigService;
 
-    private static ComponentConfigServiceNbServerInternal instance = null;
+    private ComponentConfigServiceNbServerInternal instance = null;
 
     @Activate
     public void activate() {
diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbDeviceService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbDeviceService.java
index b583800..a06acf6 100644
--- a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbDeviceService.java
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbDeviceService.java
@@ -52,7 +52,7 @@
 
     private final Logger log = getLogger(getClass());
 
-    private static DeviceServiceNbServerInternal instance = null;
+    private DeviceServiceNbServerInternal instance = null;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected GrpcServiceRegistry registry;
diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbHostService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbHostService.java
index d5e3660..2ad2bf6 100644
--- a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbHostService.java
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbHostService.java
@@ -74,7 +74,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected HostService hostService;
 
-    private static HostServiceNBServerInternal instance = null;
+    private HostServiceNBServerInternal instance = null;
 
     @Activate
     public void activate() {
diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java
index 1495467..34b8cd9 100644
--- a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java
@@ -63,7 +63,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected MastershipService mastershipService;
 
-    private static MastershipServiceNbServerInternal instance = null;
+    private MastershipServiceNbServerInternal instance = null;
 
     @Activate
     public void activate() {