diff --git a/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
index 2af9bad..7f984ab 100644
--- a/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
+++ b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
@@ -16,21 +16,9 @@
 
 package org.onosproject.net.statistic.impl;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Set;
-import java.util.TreeMap;
-import java.util.stream.Collectors;
-
-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.base.MoreObjects;
+import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableSet;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Device;
 import org.onosproject.net.Port;
@@ -52,11 +40,21 @@
 import org.onosproject.net.statistic.SummaryFlowEntryWithLoad;
 import org.onosproject.net.statistic.TypedFlowEntryWithLoad;
 import org.onosproject.utils.Comparators;
+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.base.MoreObjects;
-import com.google.common.base.Predicate;
-import com.google.common.collect.ImmutableSet;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onosproject.security.AppGuard.checkPermission;
@@ -66,15 +64,14 @@
 /**
  * Provides an implementation of the Flow Statistic Service.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = FlowStatisticService.class)
 public class FlowStatisticManager implements FlowStatisticService {
     private final Logger log = getLogger(getClass());
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StatisticStore statisticStore;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected DeviceService deviceService;
 
     @Activate