From 7122ba1d0a93532324ab29cf05bd3fa4fd99e45e Mon Sep 17 00:00:00 2001
From: Mark Hansen <markhansen@google.com>
Date: Thu, 20 Jun 2024 08:36:52 -0700
Subject: [PATCH] Java: Deprecate newExtensionWriter.

New usages should use newExtensionSerializer, which can avoid allocations for
empty field sets.

PiperOrigin-RevId: 645044533
---
 .../main/java/com/google/protobuf/GeneratedMessage.java  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
index 426adb61bf18..aeeeb94e3dc4 100644
--- a/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
@@ -1094,7 +1094,14 @@ public void writeUntil(final int end, final CodedOutputStream output) throws IOE
       }
     }
 
-    // TODO: Remove, replace with newExtensionSerializer().
+    /**
+     * For compatibility with older gencode.
+     *
+     * <p> TODO Remove this in the next breaking release.
+     *
+     * @deprecated Use {@link newExtensionSerializer()} instead.
+     */
+    @Deprecated
     protected ExtensionWriter newExtensionWriter() {
       return new ExtensionWriter(false);
     }