From 950fc895daf833ae583299f0ee7d9f2e61b2a94a Mon Sep 17 00:00:00 2001
From: Alex Abashev <alexey@abashev.ru>
Date: Tue, 17 Mar 2026 12:11:13 +0300
Subject: [PATCH] IGNITE-28255 Fix java.io.NotSerializableException:
 org.apache.ignite.internal.processors.marshaller.MarshallerMappingItem

---
 .../processors/marshaller/MarshallerMappingItem.java        | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/modules/core/src/main/java/org/apache/ignite/internal/processors/marshaller/MarshallerMappingItem.java b/modules/core/src/main/java/org/apache/ignite/internal/processors/marshaller/MarshallerMappingItem.java
index 6414d545e7377..dae5767810d15 100644
--- a/modules/core/src/main/java/org/apache/ignite/internal/processors/marshaller/MarshallerMappingItem.java
+++ b/modules/core/src/main/java/org/apache/ignite/internal/processors/marshaller/MarshallerMappingItem.java
@@ -17,6 +17,7 @@
 
 package org.apache.ignite.internal.processors.marshaller;
 
+import java.io.Serializable;
 import java.util.Objects;
 import org.apache.ignite.internal.Order;
 import org.apache.ignite.plugin.extensions.communication.Message;
@@ -26,7 +27,10 @@
  *  Used to exchange mapping information on new mapping added or missing mapping requested flows.
  *  See {@link GridMarshallerMappingProcessor} javadoc for more information.
  */
-public final class MarshallerMappingItem implements Message {
+public final class MarshallerMappingItem implements Message, Serializable {
+    /** */
+    private static final long serialVersionUID = 0L;
+
     /** */
     @Order(0)
     byte platformId;