diff --git a/spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java b/spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java
index fbe14caec7..120f676e74 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java
@@ -30,7 +30,6 @@ import java.util.stream.Stream;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.annotation.AnnotatedElementUtils;
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
@@ -751,7 +750,7 @@ public class TypeDescriptor implements Serializable {
 
 		private final Annotation[] annotations;
 
-		private AnnotatedElementAdapter(@NonNull Annotation[] annotations) {
+		private AnnotatedElementAdapter(Annotation[] annotations) {
 			this.annotations = annotations;
 		}
 
diff --git a/spring-core/src/main/java/org/springframework/core/metrics/jfr/FlightRecorderStartupStep.java b/spring-core/src/main/java/org/springframework/core/metrics/jfr/FlightRecorderStartupStep.java
index 915a52833c..c3d56b757d 100644
--- a/spring-core/src/main/java/org/springframework/core/metrics/jfr/FlightRecorderStartupStep.java
+++ b/spring-core/src/main/java/org/springframework/core/metrics/jfr/FlightRecorderStartupStep.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -21,10 +21,10 @@ import java.util.function.Consumer;
 import java.util.function.Supplier;
 
 import org.springframework.core.metrics.StartupStep;
-import org.springframework.lang.NonNull;
 
 /**
  * {@link StartupStep} implementation for the Java Flight Recorder.
+ *
  * <p>This variant delegates to a {@link FlightRecorderStartupEvent JFR event extension}
  * to collect and record data in Java Flight Recorder.
  *
@@ -114,12 +114,12 @@ class FlightRecorderStartupStep implements StartupStep {
 			add(key, value.get());
 		}
 
-		@NonNull
 		@Override
 		public Iterator<Tag> iterator() {
 			return new TagsIterator();
 		}
 
+
 		private class TagsIterator implements Iterator<Tag> {
 
 			private int idx = 0;
diff --git a/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java b/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
index f94b21cafc..3486f5acd0 100644
--- a/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
+++ b/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -63,7 +63,6 @@ import jakarta.servlet.http.Part;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.LinkedCaseInsensitiveMap;
@@ -1020,7 +1019,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
-	private static String encodeCookies(@NonNull Cookie... cookies) {
+	private static String encodeCookies(Cookie... cookies) {
 		return Arrays.stream(cookies)
 				.map(c -> c.getName() + '=' + (c.getValue() == null ? "" : c.getValue()))
 				.collect(Collectors.joining("; "));
diff --git a/spring-test/src/main/java/org/springframework/test/context/jdbc/SqlScriptsTestExecutionListener.java b/spring-test/src/main/java/org/springframework/test/context/jdbc/SqlScriptsTestExecutionListener.java
index bda23d8fb4..f219bea1f7 100644
--- a/spring-test/src/main/java/org/springframework/test/context/jdbc/SqlScriptsTestExecutionListener.java
+++ b/spring-test/src/main/java/org/springframework/test/context/jdbc/SqlScriptsTestExecutionListener.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -35,7 +35,6 @@ import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.DefaultResourceLoader;
 import org.springframework.core.io.Resource;
 import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.test.context.TestContext;
 import org.springframework.test.context.TestContextAnnotationUtils;
@@ -363,7 +362,6 @@ public class SqlScriptsTestExecutionListener extends AbstractTestExecutionListen
 		}
 	}
 
-	@NonNull
 	private ResourceDatabasePopulator createDatabasePopulator(MergedSqlConfig mergedSqlConfig) {
 		ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
 		populator.setSqlScriptEncoding(mergedSqlConfig.getEncoding());
diff --git a/spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java b/spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java
index cc2f754e8e..0cf6650939 100644
--- a/spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java
+++ b/spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -18,7 +18,6 @@ package org.springframework.http;
 
 import java.io.Serializable;
 
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 
 /**
@@ -80,8 +79,8 @@ final class DefaultHttpStatusCode implements HttpStatusCode, Comparable<HttpStat
 
 
 	@Override
-	public int compareTo(@NonNull HttpStatusCode o) {
-		return Integer.compare(this.value, o.value());
+	public int compareTo(HttpStatusCode other) {
+		return Integer.compare(this.value, other.value());
 	}
 
 	@Override
diff --git a/spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockHttpServletRequest.java b/spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockHttpServletRequest.java
index 9dcd5aae08..59eb0b977c 100644
--- a/spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockHttpServletRequest.java
+++ b/spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockHttpServletRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -63,7 +63,6 @@ import jakarta.servlet.http.Part;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.LinkedCaseInsensitiveMap;
@@ -1020,7 +1019,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
-	private static String encodeCookies(@NonNull Cookie... cookies) {
+	private static String encodeCookies(Cookie... cookies) {
 		return Arrays.stream(cookies)
 				.map(c -> c.getName() + '=' + (c.getValue() == null ? "" : c.getValue()))
 				.collect(Collectors.joining("; "));
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
index d8824b6c1c..9bf61eebf6 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
@@ -60,7 +60,6 @@ import org.springframework.http.converter.GenericHttpMessageConverter;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.server.RequestPath;
 import org.springframework.http.server.ServletServerHttpRequest;
-import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
@@ -522,7 +521,7 @@ class DefaultServerRequest implements ServerRequest {
 				}
 
 				@Override
-				public boolean addAll(@NonNull Collection<? extends Entry<String, Object>> c) {
+				public boolean addAll(Collection<? extends Entry<String, Object>> c) {
 					throw new UnsupportedOperationException();
 				}
 
@@ -537,7 +536,7 @@ class DefaultServerRequest implements ServerRequest {
 				}
 
 				@Override
-				public boolean retainAll(@NonNull Collection<?> c) {
+				public boolean retainAll(Collection<?> c) {
 					throw new UnsupportedOperationException();
 				}