diff --git a/core/store/dist/src/main/java/org/onosproject/store/device/impl/DeviceClockManager.java b/core/store/dist/src/main/java/org/onosproject/store/device/impl/DeviceClockManager.java
index 9edcc1c..fb1d4e4 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/device/impl/DeviceClockManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/device/impl/DeviceClockManager.java
@@ -15,18 +15,8 @@
  */
 package org.onosproject.store.device.impl;
 
-import static org.slf4j.LoggerFactory.getLogger;
-
-import java.util.Optional;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicLong;
-
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import org.onosproject.cluster.ClusterService;
 import org.onosproject.cluster.NodeId;
 import org.onosproject.mastership.MastershipEvent;
@@ -39,27 +29,34 @@
 import org.onosproject.net.device.DeviceClockService;
 import org.onosproject.store.Timestamp;
 import org.onosproject.store.impl.MastershipBasedTimestamp;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
-import com.google.common.cache.Cache;
-import com.google.common.cache.CacheBuilder;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.slf4j.LoggerFactory.getLogger;
 
 /**
  * Clock service to issue Timestamp based on Device Mastership.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = DeviceClockService.class)
 public class DeviceClockManager implements DeviceClockService {
 
     private final Logger log = getLogger(getClass());
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipTermService mastershipTermService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipService mastershipService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterService clusterService;
 
     protected NodeId localNodeId;
diff --git a/core/store/dist/src/main/java/org/onosproject/store/device/impl/ECDeviceStore.java b/core/store/dist/src/main/java/org/onosproject/store/device/impl/ECDeviceStore.java
index 177c41ed..178bdcf 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/device/impl/ECDeviceStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/device/impl/ECDeviceStore.java
@@ -15,24 +15,12 @@
  */
 package org.onosproject.store.device.impl;
 
-import java.util.Collection;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicReference;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import com.google.common.util.concurrent.Futures;
 import org.onlab.packet.ChassisId;
 import org.onlab.util.KryoNamespace;
 import org.onosproject.cluster.ClusterService;
@@ -73,14 +61,24 @@
 import org.onosproject.store.service.SetEventListener;
 import org.onosproject.store.service.StorageService;
 import org.onosproject.store.service.WallClockTimestamp;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.Iterables;
-import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Sets;
-import com.google.common.util.concurrent.Futures;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Verify.verify;
@@ -101,7 +99,6 @@
  * Manages the inventory of devices using a {@code EventuallyConsistentMap}.
  */
 //@Component(immediate = true, enabled = false)
-@Service
 public class ECDeviceStore
     extends AbstractStore<DeviceEvent, DeviceStoreDelegate>
     implements DeviceStore {
@@ -121,22 +118,22 @@
 
     private DistributedSet<DeviceId> availableDevices;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipService mastershipService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipTermService mastershipTermService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceClockService deviceClockService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterCommunicationService clusterCommunicator;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterService clusterService;
 
     private NodeId localNodeId;
diff --git a/core/store/dist/src/main/java/org/onosproject/store/device/impl/GossipDeviceStore.java b/core/store/dist/src/main/java/org/onosproject/store/device/impl/GossipDeviceStore.java
index e95d00d..32a9be6 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/device/impl/GossipDeviceStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/device/impl/GossipDeviceStore.java
@@ -20,12 +20,6 @@
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.apache.commons.lang3.RandomUtils;
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
 import org.onlab.packet.ChassisId;
 import org.onlab.util.KryoNamespace;
 import org.onosproject.cluster.ClusterService;
@@ -68,6 +62,11 @@
 import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.StorageService;
 import org.onosproject.store.service.WallClockTimestamp;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
 import java.io.IOException;
@@ -99,9 +98,18 @@
 import static org.onlab.util.Tools.groupedThreads;
 import static org.onlab.util.Tools.minPriority;
 import static org.onosproject.cluster.ControllerNodeToNodeId.toNodeId;
-import static org.onosproject.net.device.DeviceEvent.Type.*;
-import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.*;
+import static org.onosproject.net.device.DeviceEvent.Type.DEVICE_AVAILABILITY_CHANGED;
+import static org.onosproject.net.device.DeviceEvent.Type.PORT_ADDED;
+import static org.onosproject.net.device.DeviceEvent.Type.PORT_REMOVED;
+import static org.onosproject.net.device.DeviceEvent.Type.PORT_STATS_UPDATED;
+import static org.onosproject.net.device.DeviceEvent.Type.PORT_UPDATED;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.DEVICE_ADVERTISE;
 import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.DEVICE_REMOVED;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.DEVICE_REMOVE_REQ;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.DEVICE_STATUS_CHANGE;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.DEVICE_UPDATE;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.PORT_STATUS_UPDATE;
+import static org.onosproject.store.device.impl.GossipDeviceStoreMessageSubjects.PORT_UPDATE;
 import static org.onosproject.store.service.EventuallyConsistentMapEvent.Type.PUT;
 import static org.slf4j.LoggerFactory.getLogger;
 
@@ -109,8 +117,7 @@
  * Manages inventory of infrastructure devices using gossip protocol to distribute
  * information.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = DeviceStore.class)
 public class GossipDeviceStore
         extends AbstractStore<DeviceEvent, DeviceStoreDelegate>
         implements DeviceStore {
@@ -142,22 +149,22 @@
     // available(=UP) devices
     private final Set<DeviceId> availableDevices = Sets.newConcurrentHashSet();
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceClockService deviceClockService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterCommunicationService clusterCommunicator;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterService clusterService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipService mastershipService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipTermService termService;
 
     private static final Timestamp DEFAULT_TIMESTAMP = new MastershipBasedTimestamp(0, 0);