Polish Jackson 3 support

- Improve Javadoc.

- Suppress warnings for "removal".

- Update copyright headers.

- Migrate several tests from:
  - MappingJackson2MessageConverter to JacksonJsonMessageConverter
  - Jackson2JsonEncoder to JacksonJsonEncoder
  - Jackson2JsonDecoder to JacksonJsonDecoder
  - Jackson2SmileEncoder to JacksonSmileEncoder
  - Jackson2ObjectMapperBuilder to JsonMapper and XmlMapper
  - MappingJackson2JsonView to JacksonJsonView
  - MappingJackson2HttpMessageConverter to JacksonJsonHttpMessageConverter
  - MappingJackson2XmlHttpMessageConverter to JacksonXmlHttpMessageConverter

spring-jms/src/test/java/org/springframework/jms/listener/adapter/MessagingMessageListenerAdapterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 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.
@@ -70,7 +70,8 @@ class MessagingMessageListenerAdapterTests {
 
 	@BeforeEach
 	void setup() {
-		initializeFactory(factory);
+		factory.setBeanFactory(new StaticListableBeanFactory());
+		factory.afterPropertiesSet();
 	}
 
 	@Test
@@ -405,11 +406,6 @@ class MessagingMessageListenerAdapterTests {
 		return adapter;
 	}
 
-	private void initializeFactory(DefaultMessageHandlerMethodFactory factory) {
-		factory.setBeanFactory(new StaticListableBeanFactory());
-		factory.afterPropertiesSet();
-	}
-
 
 	@SuppressWarnings("unused")
 	private static class SampleBean {

spring-jms/src/test/java/org/springframework/jms/support/converter/MappingJackson2MessageConverterTests.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.
@@ -49,6 +49,7 @@ import static org.mockito.Mockito.verify;
  * @author Dave Syer
  * @author Stephane Nicoll
  */
+@SuppressWarnings("removal")
 class MappingJackson2MessageConverterTests {
 
 	private MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();