From 0b2bb7e751d5effd798adaf545c64a7342657ecc Mon Sep 17 00:00:00 2001
From: Juergen Hoeller <juergen.hoeller@broadcom.com>
Date: Sat, 20 Dec 2025 15:21:14 +0100
Subject: [PATCH] Declare TaskCallback return value as potentially nullable

Closes gh-36057
---
 .../main/java/org/springframework/core/task/TaskCallback.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/spring-core/src/main/java/org/springframework/core/task/TaskCallback.java b/spring-core/src/main/java/org/springframework/core/task/TaskCallback.java
index e2e8f6feda3..4a947ad1263 100644
--- a/spring-core/src/main/java/org/springframework/core/task/TaskCallback.java
+++ b/spring-core/src/main/java/org/springframework/core/task/TaskCallback.java
@@ -18,6 +18,8 @@ package org.springframework.core.task;
 
 import java.util.concurrent.Callable;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * Variant of {@link Callable} with a flexible exception signature
  * that can be adapted in the {@link SyncTaskExecutor#execute(TaskCallback)}
@@ -34,7 +36,7 @@ import java.util.concurrent.Callable;
  * @param <E> the exception propagated, if any
  * @see SyncTaskExecutor#execute(TaskCallback)
  */
-public interface TaskCallback<V, E extends Exception> extends Callable<V> {
+public interface TaskCallback<V extends @Nullable Object, E extends Exception> extends Callable<V> {
 
 	@Override
 	V call() throws E;