Fix compile warnings due to the depreacated Nullable components

- Remove the usage of Spring Nullable related annotations
  in preference to the ones from jspecify.

Signed-off-by: Soby Chacko <[email protected]>

Author: sobychacko

spring-kafka/src/main/java/org/springframework/kafka/KafkaException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 the original author or authors.
+ * Copyright 2016-2025 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.
@@ -16,9 +16,10 @@
 
 package org.springframework.kafka;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.core.NestedRuntimeException;
 import org.springframework.core.log.LogAccessor;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**

spring-kafka/src/main/java/org/springframework/kafka/annotation/KafkaListenerAnnotationBeanPostProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.
@@ -44,6 +44,7 @@
 import java.util.stream.Stream;
 
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.aop.framework.Advised;
 import org.springframework.aop.support.AopUtils;
@@ -101,7 +102,6 @@
 import org.springframework.kafka.retrytopic.RetryTopicSchedulerWrapper;
 import org.springframework.kafka.support.TopicPartitionOffset;
 import org.springframework.kafka.support.TopicPartitionOffset.SeekPosition;
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.converter.GenericMessageConverter;
 import org.springframework.messaging.converter.SmartMessageConverter;
 import org.springframework.messaging.handler.annotation.support.DefaultMessageHandlerMethodFactory;
@@ -1034,7 +1034,6 @@ else if (resolvedValue instanceof Integer intgr) {
 		}
 	}
 
-	@Nullable
 	private TopicPartitionOffset.SeekPosition resloveTopicPartitionOffsetSeekPosition(@Nullable Object seekPosition) {
 		TopicPartitionOffset.SeekPosition resloveTpoSp = null;
 		if (seekPosition instanceof String seekPositionName) {

spring-kafka/src/main/java/org/springframework/kafka/annotation/RetryTopicConfigurationProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -22,6 +22,7 @@
 import java.util.Objects;
 
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.ListableBeanFactory;
@@ -35,7 +36,6 @@
 import org.springframework.core.annotation.RepeatableContainers;
 import org.springframework.core.log.LogAccessor;
 import org.springframework.kafka.retrytopic.RetryTopicConfiguration;
-import org.springframework.lang.Nullable;
 
 /**
  *

spring-kafka/src/main/java/org/springframework/kafka/annotation/RetryableTopicAnnotationProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2024 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -26,6 +26,8 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanInitializationException;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
@@ -45,7 +47,6 @@
 import org.springframework.kafka.retrytopic.RetryTopicConfigurer;
 import org.springframework.kafka.retrytopic.RetryTopicConstants;
 import org.springframework.kafka.support.EndpointHandlerMethod;
-import org.springframework.lang.Nullable;
 import org.springframework.retry.annotation.Backoff;
 import org.springframework.retry.backoff.ExponentialBackOffPolicy;
 import org.springframework.retry.backoff.ExponentialRandomBackOffPolicy;

spring-kafka/src/main/java/org/springframework/kafka/aot/KafkaAvroBeanRegistrationAotProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -24,6 +24,7 @@
 
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.aot.hint.MemberCategory;
 import org.springframework.aot.hint.ReflectionHints;
@@ -33,7 +34,6 @@
 import org.springframework.core.ResolvableType;
 import org.springframework.core.annotation.MergedAnnotations;
 import org.springframework.kafka.listener.GenericMessageListener;
-import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ReflectionUtils;
 

spring-kafka/src/main/java/org/springframework/kafka/aot/KafkaRuntimeHints.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 the original author or authors.
+ * Copyright 2022-2025 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.
@@ -27,6 +27,7 @@
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.common.utils.AppInfoParser.AppInfo;
 import org.apache.kafka.common.utils.ImplicitLinkedHashCollection;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.aop.framework.AopProxyUtils;
 import org.springframework.aot.hint.MemberCategory;
@@ -62,7 +63,6 @@
 import org.springframework.kafka.support.serializer.ParseStringDeserializer;
 import org.springframework.kafka.support.serializer.StringOrBytesSerializer;
 import org.springframework.kafka.support.serializer.ToStringSerializer;
-import org.springframework.lang.Nullable;
 
 /**
  * {@link RuntimeHintsRegistrar} for Spring for Apache Kafka.

spring-kafka/src/main/java/org/springframework/kafka/config/AbstractKafkaListenerEndpoint.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.
@@ -24,6 +24,7 @@
 import java.util.regex.Pattern;
 
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
@@ -48,7 +49,6 @@
 import org.springframework.kafka.support.JavaUtils;
 import org.springframework.kafka.support.TopicPartitionOffset;
 import org.springframework.kafka.support.converter.MessageConverter;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 

spring-kafka/src/main/java/org/springframework/kafka/config/KafkaListenerEndpoint.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.
@@ -20,10 +20,11 @@
 import java.util.Properties;
 import java.util.regex.Pattern;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.kafka.listener.MessageListenerContainer;
 import org.springframework.kafka.support.TopicPartitionOffset;
 import org.springframework.kafka.support.converter.MessageConverter;
-import org.springframework.lang.Nullable;
 
 /**
  * Model for a Kafka listener endpoint. Can be used against a

spring-kafka/src/main/java/org/springframework/kafka/config/KafkaListenerEndpointAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2019 the original author or authors.
+ * Copyright 2018-2025 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.
@@ -20,10 +20,11 @@
 import java.util.Collections;
 import java.util.regex.Pattern;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.kafka.listener.MessageListenerContainer;
 import org.springframework.kafka.support.TopicPartitionOffset;
 import org.springframework.kafka.support.converter.MessageConverter;
-import org.springframework.lang.Nullable;
 
 /**
  * Adapter to avoid having to implement all methods.

spring-kafka/src/main/java/org/springframework/kafka/config/KafkaListenerEndpointRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2024 the original author or authors.
+ * Copyright 2014-2025 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.
@@ -23,10 +23,11 @@
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.InitializingBean;
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.handler.annotation.support.MessageHandlerMethodFactory;
 import org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolver;
 import org.springframework.util.Assert;