diff --git a/components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/internal/APIIntegrationClientServiceComponent.java b/components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/internal/APIIntegrationClientServiceComponent.java
index babfad55d9..8343372d54 100644
--- a/components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/internal/APIIntegrationClientServiceComponent.java
+++ b/components/apimgt-extensions/org.wso2.carbon.apimgt.integration.client/src/main/java/org/wso2/carbon/apimgt/integration/client/internal/APIIntegrationClientServiceComponent.java
@@ -27,19 +27,14 @@ import org.wso2.carbon.apimgt.integration.client.configs.APIMConfigReader;
 import org.wso2.carbon.apimgt.integration.client.service.IntegrationClientService;
 import io.entgra.device.mgt.core.identity.jwt.client.extension.service.JWTClientManagerService;
 
-/**
- * @scr.component name="org.wso2.carbon.api.integration.client" immediate="true"
- * @scr.reference name="api.integration.client.service"
- * interface="io.entgra.device.mgt.core.identity.jwt.client.extension.service.JWTClientManagerService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setJWTClientManagerService"
- * unbind="unsetJWTClientManagerService"
- */
+@Component(
+        name = "org.wso2.carbon.api.integration.client",
+        immediate = true)
 public class APIIntegrationClientServiceComponent {
 
     private static Log log = LogFactory.getLog(APIIntegrationClientServiceComponent.class);
 
+    @Activate
     protected void activate(ComponentContext componentContext) {
         try {
             if (log.isDebugEnabled()) {
@@ -59,10 +54,18 @@ public class APIIntegrationClientServiceComponent {
         }
     }
 
+    @Deactivate
     protected void deactivate(ComponentContext componentContext) {
         //do nothing
     }
 
+    @Reference(
+            name = "api.integration.client.service",
+            service = org.wso2.carbon.apimgt.impl.APIManagerConfigurationService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setJWTClientManagerService",
+            unbind = "unsetJWTClientManagerService")
     protected void setJWTClientManagerService(JWTClientManagerService jwtClientManagerService) {
         if (jwtClientManagerService != null) {
             log.debug("jwtClientManagerService service is initialized");
diff --git a/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.core/src/main/java/io/entgra/device/mgt/core/cea/mgt/core/internal/CEAManagementServiceComponent.java b/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.core/src/main/java/io/entgra/device/mgt/core/cea/mgt/core/internal/CEAManagementServiceComponent.java
index 624391eb7c..007134a78d 100644
--- a/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.core/src/main/java/io/entgra/device/mgt/core/cea/mgt/core/internal/CEAManagementServiceComponent.java
+++ b/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.core/src/main/java/io/entgra/device/mgt/core/cea/mgt/core/internal/CEAManagementServiceComponent.java
@@ -29,34 +29,17 @@ import io.entgra.device.mgt.core.cea.mgt.core.task.CEAPolicyMonitoringTaskManage
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.osgi.service.component.ComponentContext;
+import org.osgi.service.component.annotations.*;
 import org.wso2.carbon.ndatasource.core.DataSourceService;
 import org.wso2.carbon.ntask.core.service.TaskService;
 
-/**
- * @scr.component name="io.entgra.device.mgt.core.cea.mgt.core.CEAManagementServiceComponent" immediate="true"
- * @scr.reference name="org.wso2.carbon.ndatasource"
- * interface="org.wso2.carbon.ndatasource.core.DataSourceService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setDataSourceService"
- * unbind="unsetDataSourceService"
- * @scr.reference name="io.entgra.device.mgt.core.cea.mgt.enforcementServiceManager"
- * interface="io.entgra.device.mgt.core.cea.mgt.common.service.EnforcementServiceManager"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setEnforcementServiceManager"
- * unbind="unsetEnforcementServiceManager"
- * @scr.reference name="ntask.component"
- * interface="org.wso2.carbon.ntask.core.service.TaskService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setTaskService"
- * unbind="unsetTaskService"
- */
-
+@Component(
+        name = "io.entgra.device.mgt.core.cea.mgt.core.CEAManagementServiceComponent",
+        immediate = true)
 public class CEAManagementServiceComponent {
     private static final Log log = LogFactory.getLog(CEAManagementServiceComponent.class);
 
+    @Activate
     protected void activate(ComponentContext componentContext) {
         try {
             CEAConfigManager ceaConfigManager = CEAConfigManager.getInstance();
@@ -72,6 +55,13 @@ public class CEAManagementServiceComponent {
         }
     }
 
+    @Reference(
+            name = "org.wso2.carbon.ndatasource",
+            service = org.wso2.carbon.ndatasource.core.DataSourceService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setDataSourceService",
+            unbind = "unsetDataSourceService")
     protected void setDataSourceService(DataSourceService dataSourceService) {
         // This is to avoid cea management component getting initialized before the underlying datasource registered
     }
@@ -80,6 +70,13 @@ public class CEAManagementServiceComponent {
         // Do nothing
     }
 
+    @Reference(
+            name = "io.entgra.device.mgt.core.cea.mgt.enforcementServiceManager",
+            service = io.entgra.device.mgt.core.cea.mgt.common.service.EnforcementServiceManager.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setEnforcementServiceManager",
+            unbind = "unsetEnforcementServiceManager")
     protected void setEnforcementServiceManager(EnforcementServiceManager enforcementServiceManager) {
         CEAManagementDataHolder.getInstance().setEnforcementServiceManager(enforcementServiceManager);
         if (log.isDebugEnabled()) {
@@ -94,6 +91,13 @@ public class CEAManagementServiceComponent {
         }
     }
 
+    @Reference(
+            name = "ntask.component",
+            service = org.wso2.carbon.ntask.core.service.TaskService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setTaskService",
+            unbind = "unsetTaskService")
     protected void setTaskService(TaskService taskService) {
         CEAManagementDataHolder.getInstance().setTaskService(taskService);
         if (log.isDebugEnabled()) {
diff --git a/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.enforce/src/main/java/io/entgra/device/mgt/core/cea/mgt/enforce/internal/EnforcementServiceComponent.java b/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.enforce/src/main/java/io/entgra/device/mgt/core/cea/mgt/enforce/internal/EnforcementServiceComponent.java
index d890eb62f0..29e69dcfd9 100644
--- a/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.enforce/src/main/java/io/entgra/device/mgt/core/cea/mgt/enforce/internal/EnforcementServiceComponent.java
+++ b/components/cea-mgt/io.entgra.device.mgt.core.cea.mgt.enforce/src/main/java/io/entgra/device/mgt/core/cea/mgt/enforce/internal/EnforcementServiceComponent.java
@@ -25,27 +25,16 @@ import io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProvide
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.osgi.service.component.ComponentContext;
+import org.osgi.service.component.annotations.*;
 import org.wso2.carbon.user.core.service.RealmService;
 
-/**
- * @scr.component name="io.entgra.device.mgt.core.cea.mgt.enforcementServiceManager" immediate="true"
- * @scr.reference name="org.wso2.carbon.device.manager"
- * interface="io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setDeviceManagementServiceProviderService"
- * unbind="unsetDeviceManagementServiceProviderService"
- * @scr.reference name="user.realmservice.default"
- * interface="org.wso2.carbon.user.core.service.RealmService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setRealmService"
- * unbind="unsetRealmService"
- */
-
+@Component(
+        name = "io.entgra.device.mgt.core.cea.mgt.enforcementServiceManager",
+        immediate = true)
 public class EnforcementServiceComponent {
     private static final Log log = LogFactory.getLog(EnforcementServiceComponent.class);
 
+    @Activate
     protected void activate(ComponentContext componentContext) {
         try {
             EnforcementServiceManager enforcementServiceManager = new EnforcementServiceManagerImpl();
@@ -60,6 +49,13 @@ public class EnforcementServiceComponent {
         }
     }
 
+    @Reference(
+            name = "org.wso2.carbon.device.manager",
+            service = io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setDeviceManagementServiceProviderService",
+            unbind = "unsetDeviceManagementServiceProviderService")
     protected void setDeviceManagementServiceProviderService(DeviceManagementProviderService deviceManagementProviderService) {
         EnforcementServiceComponentDataHolder.getInstance().setDeviceManagementProviderService(deviceManagementProviderService);
         if (log.isDebugEnabled()) {
@@ -74,6 +70,13 @@ public class EnforcementServiceComponent {
         }
     }
 
+    @Reference(
+            name = "user.realmservice.default",
+            service = org.wso2.carbon.user.core.service.RealmService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setRealmService",
+            unbind = "unsetRealmService")
     protected void setRealmService(RealmService realmService) {
         EnforcementServiceComponentDataHolder.getInstance().setRealmService(realmService);
         if (log.isDebugEnabled()) {
diff --git a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/pom.xml b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/pom.xml
index 77aa526c4e..79dd397d74 100644
--- a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/pom.xml
+++ b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/pom.xml
@@ -95,6 +95,11 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.scr.ds-annotations</artifactId>
+            <scope>provided</scope>
+        </dependency>
         <dependency>
             <groupId>org.wso2.carbon</groupId>
             <artifactId>org.wso2.carbon.ndatasource.core</artifactId>
diff --git a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/device/organization/internal/DeviceOrganizationMgtServiceComponent.java b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/device/organization/internal/DeviceOrganizationMgtServiceComponent.java
index b7a84ca31a..0cf012c990 100644
--- a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/device/organization/internal/DeviceOrganizationMgtServiceComponent.java
+++ b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.device.organization/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/device/organization/internal/DeviceOrganizationMgtServiceComponent.java
@@ -31,28 +31,11 @@ import org.osgi.framework.BundleContext;
 import org.osgi.service.component.ComponentContext;
 import org.wso2.carbon.ndatasource.core.DataSourceService;
 import org.wso2.carbon.registry.core.service.RegistryService;
+import org.osgi.service.component.annotations.*;
 
-/**
- * @scr.component name="io.entgra.device.mgt.core.device.mgt.extensions.device.organization.internal.DeviceOrganizationMgtServiceComponent" immediate="true"
- * @scr.reference name="org.wso2.carbon.device.manager"
- * interface="io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setDeviceManagementService"
- * unbind="unsetDeviceManagementService"
- * @scr.reference name="org.wso2.carbon.ndatasource"
- * interface="org.wso2.carbon.ndatasource.core.DataSourceService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setDataSourceService"
- * unbind="unsetDataSourceService"
- * @scr.reference name="registry.service"
- * interface="org.wso2.carbon.registry.core.service.RegistryService"
- * cardinality="0..1"
- * policy="dynamic"
- * bind="setRegistryService"
- * unbind="unsetRegistryService"
- */
+@Component(
+        name = "io.entgra.device.mgt.core.device.mgt.extensions.device.organization.internal.DeviceOrganizationMgtServiceComponent",
+        immediate = true)
 public class DeviceOrganizationMgtServiceComponent {
 
     private static final Log log = LogFactory.getLog(DeviceOrganizationMgtServiceComponent.class);
@@ -60,6 +43,7 @@ public class DeviceOrganizationMgtServiceComponent {
     /**
      * @param componentContext
      */
+    @Activate
     protected void activate(ComponentContext componentContext) {
 
         if (log.isDebugEnabled()) {
@@ -87,6 +71,7 @@ public class DeviceOrganizationMgtServiceComponent {
     /**
      * @param componentContext
      */
+    @Deactivate
     protected void deactivate(ComponentContext componentContext) {
         if (log.isDebugEnabled()) {
             log.debug("De-activating Device Organization Management Service Component");
@@ -94,6 +79,13 @@ public class DeviceOrganizationMgtServiceComponent {
     }
 
     @SuppressWarnings("unused")
+    @Reference(
+            name = "org.wso2.carbon.device.manager",
+            service = io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setDeviceManagementService",
+            unbind = "unsetDeviceManagementService")
     protected void setDeviceManagementService(DeviceManagementProviderService deviceManagementProviderService) {
         if (log.isDebugEnabled()) {
             log.debug("Setting Device Management Service to Device Organization Mgt SC");
@@ -112,6 +104,14 @@ public class DeviceOrganizationMgtServiceComponent {
     /**
      * @param dataSourceService
      */
+
+    @Reference(
+            name = "org.wso2.carbon.ndatasource",
+            service = org.wso2.carbon.ndatasource.core.DataSourceService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setDataSourceService",
+            unbind = "unsetDataSourceService")
     protected void setDataSourceService(DataSourceService dataSourceService) {
         if (log.isDebugEnabled()) {
             log.debug("Data source service set to Device Organization Mgt component");
@@ -128,7 +128,13 @@ public class DeviceOrganizationMgtServiceComponent {
         }
     }
 
-
+    @Reference(
+            name = "registry.service",
+            service = org.wso2.carbon.registry.core.service.RegistryService.class,
+            cardinality = ReferenceCardinality.OPTIONAL,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setRegistryService",
+            unbind = "unsetRegistryService")
     protected void setRegistryService(RegistryService registryService) {
         if (log.isDebugEnabled()) {
             log.debug("RegistryService set to Device Organization Mgt component");
@@ -143,5 +149,4 @@ public class DeviceOrganizationMgtServiceComponent {
         DeviceOrganizationMgtDataHolder.getInstance().setRegistryService(null);
     }
 
-
 }
diff --git a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/userstore/role/mapper/internal/UserStoreRoleMappingServiceComponent.java b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/userstore/role/mapper/internal/UserStoreRoleMappingServiceComponent.java
index 2471c18403..9e2c3ae1e0 100644
--- a/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/userstore/role/mapper/internal/UserStoreRoleMappingServiceComponent.java
+++ b/components/device-mgt-extensions/io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper/src/main/java/io/entgra/device/mgt/core/device/mgt/extensions/userstore/role/mapper/internal/UserStoreRoleMappingServiceComponent.java
@@ -25,36 +25,19 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.osgi.framework.BundleContext;
 import org.osgi.service.component.ComponentContext;
+import org.osgi.service.component.annotations.*;
 import org.wso2.carbon.core.ServerStartupObserver;
 import org.wso2.carbon.user.core.service.RealmService;
 import org.wso2.carbon.utils.ConfigurationContextService;
 
-/**
- * @scr.component name="io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper.internal.UserStoreRoleMappingServiceComponent"
- * immediate="true"
- * @scr.reference name="user.realmservice.default"
- * interface="org.wso2.carbon.user.core.service.RealmService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setRealmService"
- * unbind="unsetRealmService"
- * @scr.reference name="config.context.service"
- * interface="org.wso2.carbon.utils.ConfigurationContextService"
- * cardinality="0..1"
- * policy="dynamic"
- * bind="setConfigurationContextService"
- * unbind="unsetConfigurationContextService"
- * @scr.reference name="entgra.heart.beat.service"
- * interface="io.entgra.device.mgt.core.server.bootup.heartbeat.beacon.service.HeartBeatManagementService"
- * cardinality="0..1"
- * policy="dynamic"
- * bind="setHeartBeatService"
- * unbind="unsetHeartBeatService"
- */
+@Component(
+        name = "io.entgra.device.mgt.core.device.mgt.extensions.userstore.role.mapper.internal.UserStoreRoleMappingServiceComponent",
+        immediate = true)
 public class UserStoreRoleMappingServiceComponent {
 
     private static final Log log = LogFactory.getLog(UserStoreRoleMappingServiceComponent.class);
 
+    @Activate
     protected void activate(ComponentContext ctx) {
         if (log.isDebugEnabled()) {
             log.debug("Activating Role Management Service Component");
@@ -72,12 +55,19 @@ public class UserStoreRoleMappingServiceComponent {
         }
     }
 
+    @Deactivate
     protected void deactivate(ComponentContext ctx) {
         if (log.isDebugEnabled()) {
             log.debug("De-activating Role Manager Service Component");
         }
     }
 
+    @Reference(
+            name = "user.realmservice.default",
+            service = org.wso2.carbon.user.core.service.RealmService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            unbind = "unsetRealmService")
     protected void setConfigurationContextService(ConfigurationContextService configurationContextService) {
         if (log.isDebugEnabled()) {
             log.debug("Setting ConfigurationContextService");
@@ -86,6 +76,12 @@ public class UserStoreRoleMappingServiceComponent {
         UserStoreRoleMappingDataHolder.getInstance().setConfigurationContextService(configurationContextService);
     }
 
+    @Reference(
+            name = "config.context.service",
+            service = org.wso2.carbon.utils.ConfigurationContextService.class,
+            cardinality = ReferenceCardinality.OPTIONAL,
+            policy = ReferencePolicy.DYNAMIC,
+            unbind = "unsetConfigurationContextService")
     protected void unsetConfigurationContextService(ConfigurationContextService configurationContextService) {
         if (log.isDebugEnabled()) {
             log.debug("Un-setting ConfigurationContextService");
@@ -118,6 +114,12 @@ public class UserStoreRoleMappingServiceComponent {
     }
 
     @SuppressWarnings("unused")
+    @Reference(
+            name = "entgra.heart.beat.service",
+            service = io.entgra.device.mgt.core.server.bootup.heartbeat.beacon.service.HeartBeatManagementService.class,
+            cardinality = ReferenceCardinality.OPTIONAL,
+            policy = ReferencePolicy.DYNAMIC,
+            unbind = "unsetHeartBeatService")
     protected void setHeartBeatService(HeartBeatManagementService heartBeatService) {
         if (log.isDebugEnabled()) {
             log.debug("Setting heart beat service");
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.analytics.data.publisher/src/main/java/org/wso2/carbon/device/mgt/analytics/data/publisher/internal/DataPublisherServiceComponent.java b/components/device-mgt/org.wso2.carbon.device.mgt.analytics.data.publisher/src/main/java/org/wso2/carbon/device/mgt/analytics/data/publisher/internal/DataPublisherServiceComponent.java
index fe2cad0ea1..0e83028553 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.analytics.data.publisher/src/main/java/org/wso2/carbon/device/mgt/analytics/data/publisher/internal/DataPublisherServiceComponent.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.analytics.data.publisher/src/main/java/org/wso2/carbon/device/mgt/analytics/data/publisher/internal/DataPublisherServiceComponent.java
@@ -27,10 +27,9 @@ import org.wso2.carbon.device.mgt.analytics.data.publisher.config.AnalyticsConfi
 import org.wso2.carbon.device.mgt.analytics.data.publisher.service.EventsPublisherService;
 import org.wso2.carbon.device.mgt.analytics.data.publisher.service.EventsPublisherServiceImpl;
 
-/**
- * @scr.component name="org.wso2.carbon.device.mgt.analytics.data.publisher.internal.DataPublisherServiceComponent"
- * immediate="true"
- */
+@Component(
+        name = "org.wso2.carbon.device.mgt.analytics.data.publisher.internal.DataPublisherServiceComponent",
+        immediate = true)
 public class DataPublisherServiceComponent {
 
     private ServiceRegistration analyticsServiceRef;
diff --git a/components/identity-extensions/org.wso2.carbon.identity.authenticator.backend.oauth/src/main/java/org/wso2/carbon/identity/authenticator/backend/oauth/internal/OAuthAuthenticatorServiceComponent.java b/components/identity-extensions/org.wso2.carbon.identity.authenticator.backend.oauth/src/main/java/org/wso2/carbon/identity/authenticator/backend/oauth/internal/OAuthAuthenticatorServiceComponent.java
index 0da3fa41ef..c4ec7e8aa1 100755
--- a/components/identity-extensions/org.wso2.carbon.identity.authenticator.backend.oauth/src/main/java/org/wso2/carbon/identity/authenticator/backend/oauth/internal/OAuthAuthenticatorServiceComponent.java
+++ b/components/identity-extensions/org.wso2.carbon.identity.authenticator.backend.oauth/src/main/java/org/wso2/carbon/identity/authenticator/backend/oauth/internal/OAuthAuthenticatorServiceComponent.java
@@ -26,20 +26,15 @@ import org.wso2.carbon.core.services.authentication.CarbonServerAuthenticator;
 import org.wso2.carbon.identity.authenticator.backend.oauth.OauthAuthenticator;
 import org.wso2.carbon.identity.oauth2.OAuth2TokenValidationService;
 
-/**
- * @scr.component name="org.wso2.carbon.identity.backend.oauth.authenticator" immediate="true"
- * @scr.reference name="identity.oauth2.validation.service"
- * interface="org.wso2.carbon.identity.oauth2.OAuth2TokenValidationService"
- * cardinality="1..1"
- * policy="dynamic"
- * bind="setOAuth2ValidationService"
- * unbind="unsetOAuth2ValidationService"
- */
+@Component(
+        name = "org.wso2.carbon.identity.backend.oauth.authenticator",
+        immediate = true)
 public class OAuthAuthenticatorServiceComponent {
 
     private static final Log log = LogFactory.getLog(OAuthAuthenticatorServiceComponent.class);
 
     @SuppressWarnings("unused")
+    @Activate
     protected void activate(ComponentContext componentContext) {
         if (log.isDebugEnabled()) {
             log.debug("Starting Backend OAuthAuthenticator Framework Bundle");
@@ -47,6 +42,7 @@ public class OAuthAuthenticatorServiceComponent {
     }
 
     @SuppressWarnings("unused")
+    @Deactivate
     protected void deactivate(ComponentContext componentContext) {
         //do nothing
     }
@@ -57,6 +53,13 @@ public class OAuthAuthenticatorServiceComponent {
      * @param tokenValidationService An instance of OAuth2TokenValidationService.
      */
     @SuppressWarnings("unused")
+    @Reference(
+            name = "identity.oauth2.validation.service",
+            service = org.wso2.carbon.identity.oauth2.OAuth2TokenValidationService.class,
+            cardinality = ReferenceCardinality.MANDATORY,
+            policy = ReferencePolicy.DYNAMIC,
+            bind = "setOAuth2ValidationService",
+            unbind = "unsetOAuth2ValidationService")
     protected void setOAuth2ValidationService(OAuth2TokenValidationService tokenValidationService) {
         if (log.isDebugEnabled()) {
             log.debug("Setting OAuth2TokenValidationService Service");