Refine NullableUtils deprecations.

See #3305
Original pull request: #3307

src/main/java/org/springframework/data/repository/core/support/MethodInvocationValidator.java

@@ -29,8 +29,8 @@ import org.springframework.data.util.NullnessMethodInvocationValidator;
  * @author Christoph Strobl
  * @since 2.0
  * @see org.jspecify.annotations.NonNull
+ * @see org.springframework.core.Nullness
  * @see org.springframework.data.util.ReflectionUtils#isNullable(org.springframework.core.MethodParameter)
- * @see org.springframework.data.util.NullableUtils
  */
 public class MethodInvocationValidator extends NullnessMethodInvocationValidator {
 

src/main/java/org/springframework/data/util/NullableUtils.java

@@ -42,18 +42,18 @@ import org.springframework.util.MultiValueMap;
 /**
  * Utility methods to introspect nullability rules declared in packages, classes and methods.
  * <p>
- * Nullability rules are declared using {@link NonNullApi}, {@link Nullable}, and JSR-305
+ * Nullability rules are declared using {@code Nullable}, {@code NonNullApi}, and JSR-305
  * {@code javax.annotation.Nonnull} annotations. By default (no annotation use), a package and its types are considered
  * allowing {@literal null} values in return values and method parameters. Nullability rules are expressed by annotating
- * a package with a JSR-305 meta annotation such as Spring's {@link NonNullApi}. All types of the package inherit the
- * package rule. Subpackages do not inherit nullability rules and must be annotated themself.
+ * a package with a JSR-305 meta annotation such as Spring's {@code NonNullApi}. All types of the package inherit the
+ * package rule. Subpackages do not inherit nullability rules and must be annotated themselves.
  *
  * <pre class="code">
  * &#64;org.jspecify.annotations.NullMarked
  * package com.example;
  * </pre>
  *
- * {@link Nullable} selectively permits {@literal null} values for method return values or method parameters by
+ * {@code  Nullable} selectively permits {@literal null} values for method return values or method parameters by
  * annotating the method respectively the parameters:
  *
  * <pre class="code">
@@ -77,7 +77,10 @@ import org.springframework.util.MultiValueMap;
  * @since 2.0
  * @see NonNullApi
  * @see Nullable
+ * @deprecated since 4.0 in favor of {@link org.springframework.core.Nullness} fully using JSpecify annotations instead
+ *             of Spring Framework's own {@literal @Nullable} and {@literal @NonNullApi} annotations.
  */
+@Deprecated(since = "4.0")
 public abstract class NullableUtils {
 
 	private static final String NON_NULL_CLASS_NAME = "javax.annotation.Nonnull";

src/main/java/org/springframework/data/util/NullnessMethodInvocationValidator.java

@@ -46,8 +46,8 @@ import org.springframework.util.ObjectUtils;
  * @author Christoph Strobl
  * @since 3.5
  * @see org.jspecify.annotations.NonNull
+ * @see org.springframework.core.Nullness
  * @see ReflectionUtils#isNullable(MethodParameter)
- * @see NullableUtils
  * @link <a href="https://www.thedictionaryofobscuresorrows.com/word/nullness">Nullness</a>
  */
 public class NullnessMethodInvocationValidator implements MethodInterceptor {
@@ -63,14 +63,12 @@ public class NullnessMethodInvocationValidator implements MethodInterceptor {
 	 */
 	public static boolean supports(Class<?> type) {
 
-		if (type.getPackage() != null
-				&& type.getPackage().isAnnotationPresent(NullMarked.class)) {
+		if (type.getPackage() != null && type.getPackage().isAnnotationPresent(NullMarked.class)) {
 			return true;
 		}
 
 		return KotlinDetector.isKotlinPresent() && KotlinReflectionUtils.isSupportedKotlinClass(type)
-				|| NullableUtils.isNonNull(type, ElementType.METHOD)
-				|| NullableUtils.isNonNull(type, ElementType.PARAMETER);
+				|| NullableUtils.isNonNull(type, ElementType.METHOD) || NullableUtils.isNonNull(type, ElementType.PARAMETER);
 	}
 
 	@Override
@@ -195,17 +193,19 @@ public class NullnessMethodInvocationValidator implements MethodInterceptor {
 
 		/**
 		 * Check method return nullability
+		 *
 		 * @param method
 		 * @return
 		 */
 		private static boolean allowNullableReturn(@Nullable Method method) {
 
-			if(method == null) {
+			if (method == null) {
 				return false;
 			}
 
-			KFunction<?> function = KotlinDetector.isKotlinType(method.getDeclaringClass()) ?
-				KotlinReflectionUtils.findKotlinFunction(method) : null;
+			KFunction<?> function = KotlinDetector.isKotlinType(method.getDeclaringClass())
+					? KotlinReflectionUtils.findKotlinFunction(method)
+					: null;
 			return function != null && function.getReturnType().isMarkedNullable();
 		}
 

src/main/kotlin/org/springframework/data/repository/kotlin/package-info.java

@@ -1,5 +1,5 @@
 /**
  * Support for Kotlin Coroutines repositories.
  */
-@org.springframework.lang.NonNullApi
+@org.jspecify.annotations.NullMarked
 package org.springframework.data.repository.kotlin;