diff --git a/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/EventSubscriptionManager.java b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/EventSubscriptionManager.java
index fdb7ed5..3671abb 100644
--- a/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/EventSubscriptionManager.java
+++ b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/EventSubscriptionManager.java
@@ -15,19 +15,7 @@
  */
 package org.onosproject.kafkaintegration.impl;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-import java.util.UUID;
-
-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.collect.ImmutableList;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.kafkaintegration.api.EventSubscriptionService;
@@ -35,25 +23,34 @@
 import org.onosproject.kafkaintegration.api.dto.DefaultEventSubscriber;
 import org.onosproject.kafkaintegration.api.dto.EventSubscriber;
 import org.onosproject.kafkaintegration.api.dto.EventSubscriberGroupId;
-import org.onosproject.kafkaintegration.api.dto.RegistrationResponse;
 import org.onosproject.kafkaintegration.api.dto.OnosEvent;
 import org.onosproject.kafkaintegration.api.dto.OnosEvent.Type;
+import org.onosproject.kafkaintegration.api.dto.RegistrationResponse;
 import org.onosproject.kafkaintegration.errors.InvalidApplicationException;
 import org.onosproject.kafkaintegration.errors.InvalidGroupIdException;
 import org.onosproject.store.serializers.KryoNamespaces;
 import org.onosproject.store.service.Serializer;
 import org.onosproject.store.service.StorageService;
+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 com.google.common.collect.ImmutableList;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Implementation of Event Subscription Manager.
  *
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = EventSubscriptionService.class)
 public class EventSubscriptionManager implements EventSubscriptionService {
 
     private final Logger log = LoggerFactory.getLogger(getClass());
@@ -67,13 +64,13 @@
 
     private static final String SUBSCRIBED_APPS = "event-subscriptions";
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected KafkaConfigService kafkaConfigService;
 
     private ApplicationId appId;