Save OperationStartupHandler in data holder

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/internal/DeviceManagementDataHolder.java

@@ -100,6 +100,7 @@ public class DeviceManagementDataHolder {
     private DeviceStatusManagementService deviceStatusManagementService;
     private APIApplicationServices apiApplicationServices;
     private PublisherRESTAPIServices publisherRESTAPIServices;
+    private OperationStartupHandler operationStartupHandler;
 
     private final Map<DeviceType, DeviceStatusTaskPluginConfig> deviceStatusTaskPluginConfigs = Collections.synchronizedMap(
             new HashMap<>());
@@ -457,4 +458,12 @@ public class DeviceManagementDataHolder {
     public void setGroupAccessAuthorizationService(GroupAccessAuthorizationService groupAccessAuthorizationService) {
         this.groupAccessAuthorizationService = groupAccessAuthorizationService;
     }
+
+    public OperationStartupHandler getOperationStartupHandler() {
+        return operationStartupHandler;
+    }
+
+    public void setOperationStartupHandler(OperationStartupHandler operationStartupHandler) {
+        this.operationStartupHandler = operationStartupHandler;
+    }
 }

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/internal/DeviceManagementServiceComponent.java

@@ -262,7 +262,9 @@ public class DeviceManagementServiceComponent {
         UserRoleCreateObserver userRoleCreateObserver = new UserRoleCreateObserver();
         bundleContext.registerService(ServerStartupObserver.class.getName(), userRoleCreateObserver, null);
 
+        /* Registering Device Operation Management Startup Handler */
         OperationStartupHandler operationStartupHandler = new OperationStartupHandler();
+        DeviceManagementDataHolder.getInstance().setOperationStartupHandler(operationStartupHandler);
         bundleContext.registerService(ServerStartupObserver.class.getName(), operationStartupHandler, null);
 
         /* Registering Device Management Service */