Use JSpecify annotations for nullability.

src/main/java/org/springframework/data/couchbase/cache/CouchbaseCacheManager.java

@@ -28,7 +28,7 @@
 import org.springframework.cache.Cache;
 import org.springframework.cache.transaction.AbstractTransactionSupportingCacheManager;
 import org.springframework.data.couchbase.CouchbaseClientFactory;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 public class CouchbaseCacheManager extends AbstractTransactionSupportingCacheManager {

src/main/java/org/springframework/data/couchbase/cache/CouchbaseCacheWriter.java

@@ -18,7 +18,7 @@
 
 import java.time.Duration;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import com.couchbase.client.java.codec.Transcoder;
 

src/main/java/org/springframework/data/couchbase/core/CouchbaseTemplate.java

@@ -30,7 +30,7 @@
 import org.springframework.data.couchbase.core.mapping.CouchbasePersistentProperty;
 import org.springframework.data.couchbase.core.query.Query;
 import org.springframework.data.mapping.context.MappingContext;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import com.couchbase.client.java.Collection;
 import com.couchbase.client.java.query.QueryScanConsistency;

src/main/java/org/springframework/data/couchbase/core/ExecutableFindByAnalyticsOperation.java

@@ -27,7 +27,7 @@
 import org.springframework.data.couchbase.core.support.WithAnalyticsConsistency;
 import org.springframework.data.couchbase.core.support.WithAnalyticsOptions;
 import org.springframework.data.couchbase.core.support.WithAnalyticsQuery;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import com.couchbase.client.java.analytics.AnalyticsOptions;
 import com.couchbase.client.java.analytics.AnalyticsScanConsistency;

src/main/java/org/springframework/data/couchbase/core/ExecutableFindByQueryOperation.java

@@ -29,7 +29,7 @@
 import org.springframework.data.couchbase.core.support.WithDistinct;
 import org.springframework.data.couchbase.core.support.WithQuery;
 import org.springframework.data.couchbase.core.support.WithQueryOptions;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import com.couchbase.client.java.query.QueryOptions;
 import com.couchbase.client.java.query.QueryScanConsistency;

src/main/java/org/springframework/data/couchbase/core/convert/BooleanToEnumConverterFactory.java

@@ -20,7 +20,7 @@
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterFactory;
 import org.springframework.data.convert.ReadingConverter;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 import com.couchbase.client.core.encryption.CryptoManager;

src/main/java/org/springframework/data/couchbase/core/convert/CouchbaseConversionContext.java

@@ -19,7 +19,7 @@
 import org.springframework.data.couchbase.core.mapping.CouchbasePersistentProperty;
 import org.springframework.data.mapping.model.ConvertingPropertyAccessor;
 import org.springframework.data.util.TypeInformation;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * {@link ValueConversionContext} that allows to delegate read/write to an underlying {@link CouchbaseConverter}.

src/main/java/org/springframework/data/couchbase/core/convert/IntegerToEnumConverterFactory.java

@@ -20,7 +20,7 @@
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterFactory;
 import org.springframework.data.convert.ReadingConverter;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 import com.couchbase.client.core.encryption.CryptoManager;

src/main/java/org/springframework/data/couchbase/core/convert/MappingCouchbaseConverter.java

@@ -72,7 +72,7 @@
 import org.springframework.data.mapping.model.SpELExpressionEvaluator;
 import org.springframework.data.mapping.model.SpELExpressionParameterValueProvider;
 import org.springframework.data.util.TypeInformation;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 

src/main/java/org/springframework/data/couchbase/core/convert/StringToEnumConverterFactory.java

@@ -18,7 +18,7 @@
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterFactory;
 import org.springframework.data.convert.ReadingConverter;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 import com.couchbase.client.core.encryption.CryptoManager;

src/main/java/org/springframework/data/couchbase/core/index/CouchbasePersistentEntityIndexResolver.java

@@ -32,7 +32,7 @@
 import org.springframework.data.mapping.PropertyHandler;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.util.TypeInformation;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 

src/main/java/org/springframework/data/couchbase/core/query/Meta.java

@@ -20,7 +20,7 @@
 import java.util.Map;
 import java.util.Map.Entry;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;

src/main/java/org/springframework/data/couchbase/core/query/QueryCriteria.java

@@ -25,7 +25,7 @@
 import java.util.Locale;
 
 import org.springframework.data.couchbase.core.convert.CouchbaseConverter;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.CollectionUtils;
 
 import com.couchbase.client.core.error.CouchbaseException;

src/main/java/org/springframework/data/couchbase/repository/query/AbstractCouchbaseQuery.java

@@ -31,7 +31,7 @@
 import org.springframework.data.repository.query.RepositoryQuery;
 import org.springframework.data.repository.query.ResultProcessor;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/couchbase/repository/query/AbstractCouchbaseQueryBase.java

@@ -31,7 +31,7 @@
 import org.springframework.data.repository.query.ResultProcessor;
 import org.springframework.data.util.TypeInformation;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/couchbase/repository/query/AbstractReactiveCouchbaseQuery.java

@@ -30,7 +30,7 @@
 import org.springframework.data.repository.query.RepositoryQuery;
 import org.springframework.data.repository.query.ResultProcessor;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 
 /**

src/main/java/org/springframework/data/couchbase/repository/support/CouchbaseAnnotationProcessor.java

@@ -37,7 +37,7 @@
 import com.querydsl.core.annotations.QueryEntities;
 import com.querydsl.core.annotations.QuerySupertype;
 import com.querydsl.core.annotations.QueryTransient;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Annotation processor to create Querydsl query types for QueryDsl annotated classes.

src/main/java/org/springframework/data/couchbase/repository/support/CrudMethodMetadataPostProcessor.java

@@ -34,7 +34,7 @@
 import org.springframework.data.couchbase.repository.Scope;
 import org.springframework.data.repository.core.RepositoryInformation;
 import org.springframework.data.repository.core.support.RepositoryProxyPostProcessor;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;

src/main/java/org/springframework/data/couchbase/repository/support/SpringDataCouchbaseQuery.java

@@ -32,7 +32,7 @@
 import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.support.PageableExecutionUtils;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 import com.mysema.commons.lang.CloseableIterator;
 import com.mysema.commons.lang.EmptyCloseableIterator;

src/main/java/org/springframework/data/couchbase/repository/support/SpringDataCouchbaseSerializer.java

@@ -28,7 +28,7 @@
 import org.springframework.data.couchbase.core.query.QueryCriteriaDefinition;
 import org.springframework.data.mapping.context.MappingContext;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 

src/main/java/org/springframework/data/couchbase/transaction/CouchbaseCallbackTransactionManager.java

@@ -31,7 +31,7 @@
 import org.springframework.data.couchbase.transaction.error.TransactionRollbackRequestedException;
 import org.springframework.data.couchbase.transaction.error.TransactionSystemAmbiguousException;
 import org.springframework.data.couchbase.transaction.error.TransactionSystemUnambiguousException;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.transaction.IllegalTransactionStateException;
 import org.springframework.transaction.ReactiveTransaction;
 import org.springframework.transaction.TransactionDefinition;

src/main/java/org/springframework/data/couchbase/transaction/CouchbaseResourceHolder.java

@@ -18,7 +18,7 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.transaction.support.ResourceHolderSupport;
 
 import com.couchbase.client.core.annotation.Stability;

src/main/java/org/springframework/data/couchbase/transaction/CouchbaseTransactionInterceptor.java

@@ -20,7 +20,7 @@
 
 import com.couchbase.client.core.annotation.Stability;
 import org.aopalliance.intercept.MethodInterceptor;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.transaction.TransactionManager;
 import org.springframework.transaction.interceptor.TransactionAttribute;
 import org.springframework.transaction.interceptor.TransactionAttributeSource;

src/test/java/org/springframework/data/couchbase/domain/Person.java

@@ -27,7 +27,7 @@
 import org.springframework.data.couchbase.core.mapping.Document;
 import org.springframework.data.couchbase.core.mapping.Field;
 import org.springframework.data.domain.Persistable;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Person entity for tests.

src/test/java/org/springframework/data/couchbase/transactions/CouchbaseTransactionalPropagationIntegrationTests.java

@@ -42,7 +42,7 @@
 import org.springframework.data.couchbase.util.ClusterType;
 import org.springframework.data.couchbase.util.IgnoreWhen;
 import org.springframework.data.couchbase.util.JavaIntegrationTests;
-import org.springframework.lang.Nullable;
+import org.jspecify.annotations.Nullable;
 import org.springframework.stereotype.Service;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;