fix instansiating of device provider serviceImpl with empty plugin repo

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/internal/DeviceManagementServiceComponent.java

@@ -130,9 +130,6 @@ public class DeviceManagementServiceComponent {
             /* Initializing app manager connector */
             this.initAppManagerConnector();
 
-            DeviceManagementProviderService deviceManagementProvider =
-                    new DeviceManagementProviderServiceImpl(this.getPluginRepository());
-            DeviceManagementDataHolder.getInstance().setDeviceManagementProvider(deviceManagementProvider);
             OperationManagementDAOFactory.init(dsConfig);
 
             /* If -Dsetup option enabled then create device management database schema */
@@ -203,8 +200,11 @@ public class DeviceManagementServiceComponent {
         }
         /* Registering Device Management Service */
         BundleContext bundleContext = componentContext.getBundleContext();
+        DeviceManagementProviderService deviceManagementProvider =
+                new DeviceManagementProviderServiceImpl(this.getPluginRepository());
+        DeviceManagementDataHolder.getInstance().setDeviceManagementProvider(deviceManagementProvider);
         bundleContext.registerService(DeviceManagementProviderService.class.getName(),
-                new DeviceManagementProviderServiceImpl(), null);
+                deviceManagementProvider, null);
 
         APIPublisherService publisher = new APIPublisherServiceImpl();
         DeviceManagementDataHolder.getInstance().setApiPublisherService(publisher);

components/user-mgt/org.wso2.carbon.device.mgt.user.core/src/main/java/org/wso2/carbon/device/mgt/user/core/internal/DeviceMgtUserServiceComponent.java

@@ -55,7 +55,7 @@ public class DeviceMgtUserServiceComponent {
             }
             /* Registering User Management service */
             BundleContext bundleContext = componentContext.getBundleContext();
-            bundleContext.registerService(org.wso2.carbon.device.mgt.user.core.UserManager.class,
+            bundleContext.registerService(org.wso2.carbon.device.mgt.user.core.UserManager.class.getName(),
                     new org.wso2.carbon.device.mgt.user.core.service.UserManagementService(), null);
             if (log.isDebugEnabled()) {
                 log.debug("User management core bundle has been successfully initialized");