diff --git a/packages/java/tests/spring/react-grid-test/src/main/java/com/vaadin/hilla/test/reactgrid/Application.java b/packages/java/tests/spring/react-grid-test/src/main/java/com/vaadin/hilla/test/reactgrid/Application.java
index 07389166e3..f8b693e6e7 100644
--- a/packages/java/tests/spring/react-grid-test/src/main/java/com/vaadin/hilla/test/reactgrid/Application.java
+++ b/packages/java/tests/spring/react-grid-test/src/main/java/com/vaadin/hilla/test/reactgrid/Application.java
@@ -1,7 +1,10 @@
 package com.vaadin.hilla.test.reactgrid;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
 
 import com.vaadin.flow.component.page.AppShellConfigurator;
 import com.vaadin.flow.theme.Theme;
@@ -13,4 +16,13 @@ public class Application implements AppShellConfigurator {
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }
+
+    @Bean
+    @Primary
+    ObjectMapper myObjectMapper() {
+        // This is only to test that you can have a custom object mapper without
+        // causing problems for Hilla
+        return new ObjectMapper();
+    }
+
 }