Handle async request timeout exception

application/src/main/java/org/thingsboard/server/controller/BaseController.java

@@ -32,6 +32,7 @@ import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
 import org.springframework.web.context.request.async.DeferredResult;
 import org.thingsboard.server.cluster.TbClusterService;
 import org.thingsboard.server.common.data.Customer;
@@ -346,6 +347,8 @@ public abstract class BaseController {
             return new ThingsboardException(exception.getMessage(), ThingsboardErrorCode.BAD_REQUEST_PARAMS);
         } else if (exception instanceof MessagingException) {
             return new ThingsboardException("Unable to send mail: " + exception.getMessage(), ThingsboardErrorCode.GENERAL);
+        } else if (exception instanceof AsyncRequestTimeoutException) {
+            return new ThingsboardException("Request timeout", ThingsboardErrorCode.GENERAL);
         } else {
             return new ThingsboardException(exception.getMessage(), exception, ThingsboardErrorCode.GENERAL);
         }