diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
index 886115b..702df7e 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
@@ -23,14 +23,6 @@
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.Sets;
-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.Modified;
-import org.apache.felix.scr.annotations.Property;
-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.BasePacket;
 import org.onlab.packet.DHCP;
 import org.onlab.packet.Ethernet;
@@ -54,44 +46,50 @@
 import org.onosproject.dhcprelay.config.IgnoreDhcpConfig;
 import org.onosproject.dhcprelay.store.DhcpRecord;
 import org.onosproject.dhcprelay.store.DhcpRelayStore;
+import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Device;
 import org.onosproject.net.DeviceId;
+import org.onosproject.net.Host;
+import org.onosproject.net.HostId;
+import org.onosproject.net.HostLocation;
 import org.onosproject.net.behaviour.Pipeliner;
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.flow.DefaultTrafficSelector;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
 import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
 import org.onosproject.net.flowobjective.DefaultForwardingObjective;
 import org.onosproject.net.flowobjective.FlowObjectiveService;
 import org.onosproject.net.flowobjective.ForwardingObjective;
 import org.onosproject.net.flowobjective.Objective;
 import org.onosproject.net.flowobjective.ObjectiveContext;
 import org.onosproject.net.flowobjective.ObjectiveError;
+import org.onosproject.net.host.DefaultHostDescription;
+import org.onosproject.net.host.HostDescription;
 import org.onosproject.net.host.HostEvent;
 import org.onosproject.net.host.HostListener;
 import org.onosproject.net.host.HostProvider;
 import org.onosproject.net.host.HostProviderRegistry;
 import org.onosproject.net.host.HostProviderService;
-import org.onosproject.net.intf.Interface;
-import org.onosproject.net.intf.InterfaceService;
-import org.onosproject.net.packet.PacketPriority;
-import org.onosproject.net.provider.ProviderId;
-import org.onosproject.routeservice.Route;
-import org.onosproject.routeservice.RouteStore;
-import org.onosproject.net.ConnectPoint;
-import org.onosproject.net.Host;
-import org.onosproject.net.HostId;
-import org.onosproject.net.HostLocation;
-import org.onosproject.net.flow.DefaultTrafficTreatment;
-import org.onosproject.net.flow.TrafficTreatment;
-import org.onosproject.net.host.DefaultHostDescription;
-import org.onosproject.net.host.HostDescription;
 import org.onosproject.net.host.HostService;
 import org.onosproject.net.host.InterfaceIpAddress;
+import org.onosproject.net.intf.Interface;
+import org.onosproject.net.intf.InterfaceService;
 import org.onosproject.net.packet.DefaultOutboundPacket;
 import org.onosproject.net.packet.OutboundPacket;
 import org.onosproject.net.packet.PacketContext;
+import org.onosproject.net.packet.PacketPriority;
 import org.onosproject.net.packet.PacketService;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.routeservice.Route;
+import org.onosproject.routeservice.RouteStore;
 import org.osgi.service.component.ComponentContext;
+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.Modified;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -121,9 +119,8 @@
 import static org.onosproject.net.flowobjective.Objective.Operation.REMOVE;
 
 
-@Component
-@Service
-@Property(name = "version", value = "4")
+@Component(service = { DhcpHandler.class, HostProvider.class })
+//@Property(name = "version", value = "4")
 public class Dhcp4HandlerImpl implements DhcpHandler, HostProvider {
     public static final String DHCP_V4_RELAY_APP = "org.onosproject.Dhcp4HandlerImpl";
     public static final ProviderId PROVIDER_ID = new ProviderId("dhcp4", DHCP_V4_RELAY_APP);
@@ -152,34 +149,34 @@
     );
     private static Logger log = LoggerFactory.getLogger(Dhcp4HandlerImpl.class);
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpRelayStore dhcpRelayStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected PacketService packetService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected RouteStore routeStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected InterfaceService interfaceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostService hostService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostProviderRegistry providerRegistry;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceService deviceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected FlowObjectiveService flowObjectiveService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ComponentConfigService cfgService;
 
     protected HostProviderService providerService;
@@ -190,8 +187,8 @@
     private List<DhcpServerInfo> defaultServerInfoList = new CopyOnWriteArrayList<>();
     private List<DhcpServerInfo> indirectServerInfoList = new CopyOnWriteArrayList<>();
 
-    @Property(name = Dhcp4HandlerImpl.LQ_ROUTE_PROPERTY_NAME, boolValue = false,
-            label = "Enable learning routing information from LQ")
+    //@Property(name = Dhcp4HandlerImpl.LQ_ROUTE_PROPERTY_NAME, boolValue = false,
+    //        label = "Enable learning routing information from LQ")
     private Boolean learnRouteFromLeasequery = Boolean.TRUE;
 
     private Executor hostEventExecutor = newSingleThreadExecutor(
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
index e36daf9..ba759a2 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
@@ -22,14 +22,12 @@
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.Sets;
 import com.google.common.collect.ImmutableSet;
-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.Modified;
-import org.apache.felix.scr.annotations.Property;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
+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.Modified;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.onlab.packet.BasePacket;
 import org.onlab.packet.DHCP6;
 import org.onlab.packet.IPv6;
@@ -126,9 +124,8 @@
 import static org.onosproject.net.flowobjective.Objective.Operation.REMOVE;
 import java.util.concurrent.Semaphore;
 
-@Component
-@Service
-@Property(name = "version", value = "6")
+@Component(service = { DhcpHandler.class, HostProvider.class })
+//@Property(name = "version", value = "6")
 public class Dhcp6HandlerImpl implements DhcpHandler, HostProvider {
     public static final String DHCP_V6_RELAY_APP = "org.onosproject.Dhcp6HandlerImpl";
     public static final ProviderId PROVIDER_ID = new ProviderId("dhcp6", DHCP_V6_RELAY_APP);
@@ -164,44 +161,44 @@
     );
     private static Logger log = LoggerFactory.getLogger(Dhcp6HandlerImpl.class);
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpRelayStore dhcpRelayStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpRelayCountersStore dhcpRelayCountersStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected PacketService packetService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected RouteStore routeStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected InterfaceService interfaceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostService hostService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostProviderRegistry providerRegistry;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpFpmPrefixStore dhcpFpmPrefixStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceService deviceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected FlowObjectiveService flowObjectiveService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ComponentConfigService cfgService;
 
-    @Property(name = Dhcp6HandlerImpl.LQ_ROUTE_PROPERTY_NAME, boolValue = false,
-            label = "Enable learning routing information from LQ")
+    //@Property(name = Dhcp6HandlerImpl.LQ_ROUTE_PROPERTY_NAME, boolValue = false,
+    //        label = "Enable learning routing information from LQ")
     private Boolean learnRouteFromLeasequery = Boolean.TRUE;
 
     protected HostProviderService providerService;
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/DhcpRelayManager.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/DhcpRelayManager.java
index f2ca330..3bb7f4e 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/DhcpRelayManager.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/DhcpRelayManager.java
@@ -15,37 +15,19 @@
  */
 package org.onosproject.dhcprelay;
 
-import java.nio.ByteBuffer;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Dictionary;
-import java.util.List;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.Set;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Streams;
-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.Modified;
-import org.apache.felix.scr.annotations.Property;
-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.ARP;
 import org.onlab.packet.DHCP;
 import org.onlab.packet.DHCP6;
-import org.onlab.packet.IPacket;
-import org.onlab.packet.IPv6;
 import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPacket;
 import org.onlab.packet.IPv4;
+import org.onlab.packet.IPv6;
 import org.onlab.packet.Ip4Address;
-import org.onlab.packet.MacAddress;
 import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
 import org.onlab.packet.UDP;
 import org.onlab.packet.VlanId;
 import org.onlab.util.Tools;
@@ -58,56 +40,68 @@
 import org.onosproject.dhcprelay.config.DefaultDhcpRelayConfig;
 import org.onosproject.dhcprelay.config.DhcpServerConfig;
 import org.onosproject.dhcprelay.config.EnableDhcpFpmConfig;
-import org.onosproject.dhcprelay.config.IndirectDhcpRelayConfig;
 import org.onosproject.dhcprelay.config.IgnoreDhcpConfig;
+import org.onosproject.dhcprelay.config.IndirectDhcpRelayConfig;
+import org.onosproject.dhcprelay.store.DhcpFpmPrefixStore;
 import org.onosproject.dhcprelay.store.DhcpRecord;
 import org.onosproject.dhcprelay.store.DhcpRelayStore;
-import org.onosproject.dhcprelay.store.DhcpFpmPrefixStore;
-import org.onosproject.routing.fpm.api.FpmRecord;
+import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Device;
 import org.onosproject.net.Host;
-import org.onosproject.net.config.Config;
-import org.onosproject.net.device.DeviceEvent;
-import org.onosproject.net.device.DeviceListener;
-import org.onosproject.net.device.DeviceService;
-import org.onosproject.net.intf.Interface;
-import org.onosproject.net.intf.InterfaceService;
-import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.HostId;
+import org.onosproject.net.config.Config;
 import org.onosproject.net.config.ConfigFactory;
 import org.onosproject.net.config.NetworkConfigEvent;
 import org.onosproject.net.config.NetworkConfigListener;
 import org.onosproject.net.config.NetworkConfigRegistry;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.flow.DefaultTrafficSelector;
 import org.onosproject.net.flow.DefaultTrafficTreatment;
 import org.onosproject.net.flow.TrafficSelector;
 import org.onosproject.net.flow.TrafficTreatment;
 import org.onosproject.net.host.HostService;
+import org.onosproject.net.intf.Interface;
+import org.onosproject.net.intf.InterfaceService;
 import org.onosproject.net.packet.DefaultOutboundPacket;
 import org.onosproject.net.packet.OutboundPacket;
 import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketPriority;
 import org.onosproject.net.packet.PacketProcessor;
 import org.onosproject.net.packet.PacketService;
-
+import org.onosproject.routing.fpm.api.FpmRecord;
 import org.osgi.service.component.ComponentContext;
+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.Modified;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Dictionary;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
 import static org.onlab.util.Tools.groupedThreads;
-
-
-import com.google.common.collect.ImmutableSet;
-
 import static org.onosproject.net.config.basics.SubjectFactories.APP_SUBJECT_FACTORY;
 
 /**
  * DHCP Relay Agent Application Component.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = DhcpRelayService.class)
 public class DhcpRelayManager implements DhcpRelayService {
     public static final String DHCP_RELAY_APP = "org.onosproject.dhcprelay";
     public static final String ROUTE_STORE_IMPL =
@@ -159,51 +153,51 @@
     );
 
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected NetworkConfigRegistry cfgService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected PacketService packetService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected HostService hostService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected InterfaceService interfaceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpRelayStore dhcpRelayStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ComponentConfigService compCfgService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceService deviceService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DhcpFpmPrefixStore dhcpFpmPrefixStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY,
+    @Reference(cardinality = ReferenceCardinality.MANDATORY,
             target = "(version=4)")
     protected DhcpHandler v4Handler;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY,
+    @Reference(cardinality = ReferenceCardinality.MANDATORY,
             target = "(version=6)")
     protected DhcpHandler v6Handler;
 
-    @Property(name = "arpEnabled", boolValue = true,
-            label = "Enable Address resolution protocol")
+    //@Property(name = "arpEnabled", boolValue = true,
+    //        label = "Enable Address resolution protocol")
     protected boolean arpEnabled = true;
 
-    @Property(name = "dhcpPollInterval", intValue = 24 * 3600,
-            label = "dhcp relay poll interval")
+    //@Property(name = "dhcpPollInterval", intValue = 24 * 3600,
+    //        label = "dhcp relay poll interval")
     protected int dhcpPollInterval = 24 * 3600;
 
-    @Property(name = "dhcpFpmEnabled", boolValue = false,
-            label = "Enable DhcpRelay Fpm")
+    //@Property(name = "dhcpFpmEnabled", boolValue = false,
+    //        label = "Enable DhcpRelay Fpm")
     protected boolean dhcpFpmEnabled = false;
 
     private ScheduledExecutorService timerExecutor;
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayCountersStore.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayCountersStore.java
index 4b7b26c..a668463 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayCountersStore.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayCountersStore.java
@@ -15,34 +15,31 @@
  */
 package org.onosproject.dhcprelay.store;
 
-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.util.KryoNamespace;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
+import org.onosproject.store.serializers.KryoNamespaces;
 import org.onosproject.store.service.ConsistentMap;
 import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+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 org.slf4j.LoggerFactory;
-import org.onosproject.store.serializers.KryoNamespaces;
 
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import org.onosproject.store.service.Versioned;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = DhcpRelayCountersStore.class)
 public class DistributedDhcpRelayCountersStore implements DhcpRelayCountersStore {
     private static final KryoNamespace.Builder APP_KYRO = KryoNamespace.newBuilder()
             .register(KryoNamespaces.API)
@@ -51,10 +48,10 @@
     private Logger log = LoggerFactory.getLogger(getClass());
     private ConsistentMap<String, DhcpRelayCounters> counters;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
 
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayStore.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayStore.java
index 884d9cc..c622be2 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayStore.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedDhcpRelayStore.java
@@ -16,12 +16,6 @@
 
 package org.onosproject.dhcprelay.store;
 
-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.DHCP;
 import org.onlab.packet.DHCP6;
 import org.onlab.util.KryoNamespace;
@@ -33,6 +27,11 @@
 import org.onosproject.store.service.EventuallyConsistentMapListener;
 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.util.Collection;
@@ -44,8 +43,7 @@
 /**
  * Distributed DHCP relay store.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = DhcpRelayStore.class)
 public class DistributedDhcpRelayStore implements DhcpRelayStore {
     private static final KryoNamespace APP_KRYO = KryoNamespace.newBuilder()
             .register(KryoNamespaces.API)
@@ -60,7 +58,7 @@
     private EventuallyConsistentMap<HostId, DhcpRecord> dhcpRecords;
     private EventuallyConsistentMapListener<HostId, DhcpRecord> listener;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
     @Activate
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedFpmPrefixStore.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedFpmPrefixStore.java
index bc95d0b..f199671 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedFpmPrefixStore.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/store/DistributedFpmPrefixStore.java
@@ -16,45 +16,35 @@
 
 package org.onosproject.dhcprelay.store;
 
-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.apache.felix.scr.annotations.Property;
-import org.onlab.util.KryoNamespace;
-import org.onosproject.store.StoreDelegate;
 import org.onlab.packet.IpPrefix;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.routing.fpm.api.FpmPrefixStoreEvent;
+import org.onosproject.routing.fpm.api.FpmRecord;
+import org.onosproject.store.StoreDelegate;
 import org.onosproject.store.serializers.KryoNamespaces;
 import org.onosproject.store.service.EventuallyConsistentMap;
 import org.onosproject.store.service.EventuallyConsistentMapEvent;
 import org.onosproject.store.service.EventuallyConsistentMapListener;
 import org.onosproject.store.service.StorageService;
 import org.onosproject.store.service.WallClockTimestamp;
-import org.onosproject.routing.fpm.api.FpmRecord;
-import org.onosproject.routing.fpm.api.FpmPrefixStoreEvent;
-
-
-
-
+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.util.Collection;
 import java.util.Optional;
 
-
-
-
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.slf4j.LoggerFactory.getLogger;
 
 /**
  * Persistent Fpm Prefix Store with Listener.
  */
-@Component(immediate = true)
-@Property(name = "fpm_type", value = "DHCP")
-@Service
+@Component(immediate = true, service = DhcpFpmPrefixStore.class)
+//@Property(name = "fpm_type", value = "DHCP")
 public class DistributedFpmPrefixStore implements DhcpFpmPrefixStore {
 
     private static final KryoNamespace APP_KRYO = KryoNamespace.newBuilder()
@@ -68,7 +58,7 @@
     private EventuallyConsistentMap<IpPrefix, FpmRecord> dhcpFpmRecords;
     private EventuallyConsistentMapListener<IpPrefix, FpmRecord> listener;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
     @Activate