diff --git a/spring-core/src/main/java/org/springframework/cglib/core/ReflectUtils.java b/spring-core/src/main/java/org/springframework/cglib/core/ReflectUtils.java
index fd4077b78b1..bbbdcbaeee3 100644
--- a/spring-core/src/main/java/org/springframework/cglib/core/ReflectUtils.java
+++ b/spring-core/src/main/java/org/springframework/cglib/core/ReflectUtils.java
@@ -463,10 +463,21 @@ public class ReflectUtils {
 				c = lookup.defineClass(b);
 			}
 			catch (LinkageError | IllegalArgumentException ex) {
-				// in case of plain LinkageError (class already defined)
-				// or IllegalArgumentException (class in different package):
-				// fall through to traditional ClassLoader.defineClass below
-				t = ex;
+				if (ex instanceof LinkageError) {
+					// Could be a ClassLoader mismatch with the class pre-existing in a
+					// parent ClassLoader -> try loadClass before giving up completely.
+					try {
+						c = contextClass.getClassLoader().loadClass(className);
+					}
+					catch (ClassNotFoundException cnfe) {
+					}
+				}
+				if (c == null) {
+					// in case of plain LinkageError (class already defined)
+					// or IllegalArgumentException (class in different package):
+					// fall through to traditional ClassLoader.defineClass below
+					t = ex;
+				}
 			}
 			catch (Throwable ex) {
 				throw new CodeGenerationException(ex);
diff --git a/spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java b/spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java
index 5cd39685fa2..79836518a16 100644
--- a/spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java
+++ b/spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -85,6 +85,7 @@ public class ExponentialBackOff implements BackOff {
 	 */
 	public static final int DEFAULT_MAX_ATTEMPTS = Integer.MAX_VALUE;
 
+
 	private long initialInterval = DEFAULT_INITIAL_INTERVAL;
 
 	private double multiplier = DEFAULT_MULTIPLIER;
@@ -204,6 +205,7 @@ public class ExponentialBackOff implements BackOff {
 		return this.maxAttempts;
 	}
 
+
 	@Override
 	public BackOffExecution start() {
 		return new ExponentialBackOffExecution();
@@ -225,6 +227,7 @@ public class ExponentialBackOff implements BackOff {
 				.toString();
 	}
 
+
 	private class ExponentialBackOffExecution implements BackOffExecution {
 
 		private long currentInterval = -1;
diff --git a/spring-core/src/main/java/org/springframework/util/backoff/FixedBackOff.java b/spring-core/src/main/java/org/springframework/util/backoff/FixedBackOff.java
index b4d80c48122..9695077362b 100644
--- a/spring-core/src/main/java/org/springframework/util/backoff/FixedBackOff.java
+++ b/spring-core/src/main/java/org/springframework/util/backoff/FixedBackOff.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ public class FixedBackOff implements BackOff {
 	 */
 	public static final long UNLIMITED_ATTEMPTS = Long.MAX_VALUE;
 
+
 	private long interval = DEFAULT_INTERVAL;
 
 	private long maxAttempts = UNLIMITED_ATTEMPTS;
@@ -86,6 +87,7 @@ public class FixedBackOff implements BackOff {
 		return this.maxAttempts;
 	}
 
+
 	@Override
 	public BackOffExecution start() {
 		return new FixedBackOffExecution();