diff --git a/spring-core/src/test/java/org/springframework/core/annotation/AnnotatedElementUtilsTests.java b/spring-core/src/test/java/org/springframework/core/annotation/AnnotatedElementUtilsTests.java
index 9490fb0712f..21fe0ec480d 100644
--- a/spring-core/src/test/java/org/springframework/core/annotation/AnnotatedElementUtilsTests.java
+++ b/spring-core/src/test/java/org/springframework/core/annotation/AnnotatedElementUtilsTests.java
@@ -31,8 +31,10 @@ import java.util.Date;
 import java.util.List;
 import java.util.Set;
 
-import javax.annotation.Nonnull;
-import javax.annotation.ParametersAreNonnullByDefault;
+import javax.annotation.RegEx;
+import javax.annotation.Syntax;
+import javax.annotation.concurrent.ThreadSafe;
+import javax.annotation.meta.TypeQualifierNickname;
 import javax.annotation.meta.When;
 
 import jakarta.annotation.Resource;
@@ -46,6 +48,7 @@ import org.springframework.core.annotation.AnnotationUtilsTests.WebController;
 import org.springframework.core.annotation.AnnotationUtilsTests.WebMapping;
 import org.springframework.core.testfixture.stereotype.Component;
 import org.springframework.core.testfixture.stereotype.Indexed;
+import org.springframework.lang.Contract;
 import org.springframework.util.MultiValueMap;
 
 import static java.util.Arrays.asList;
@@ -237,9 +240,8 @@ class AnnotatedElementUtilsTests {
 	@SuppressWarnings("deprecation")
 	void isAnnotatedForPlainTypes() {
 		assertThat(isAnnotated(Order.class, Documented.class)).isTrue();
-		assertThat(isAnnotated(org.springframework.lang.NonNullApi.class, Documented.class)).isTrue();
-		assertThat(isAnnotated(org.springframework.lang.NonNullApi.class, Nonnull.class)).isTrue();
-		assertThat(isAnnotated(ParametersAreNonnullByDefault.class, Nonnull.class)).isTrue();
+		assertThat(isAnnotated(Inherited.class, Documented.class)).isTrue();
+		assertThat(isAnnotated(Contract.class, Documented.class)).isTrue();
 	}
 
 	@Test
@@ -278,9 +280,8 @@ class AnnotatedElementUtilsTests {
 	@SuppressWarnings("deprecation")
 	void hasAnnotationForPlainTypes() {
 		assertThat(hasAnnotation(Order.class, Documented.class)).isTrue();
-		assertThat(hasAnnotation(org.springframework.lang.NonNullApi.class, Documented.class)).isTrue();
-		assertThat(hasAnnotation(org.springframework.lang.NonNullApi.class, Nonnull.class)).isTrue();
-		assertThat(hasAnnotation(ParametersAreNonnullByDefault.class, Nonnull.class)).isTrue();
+		assertThat(hasAnnotation(Inherited.class, Documented.class)).isTrue();
+		assertThat(hasAnnotation(Contract.class, Documented.class)).isTrue();
 	}
 
 	@Test
@@ -346,17 +347,16 @@ class AnnotatedElementUtilsTests {
 	@SuppressWarnings("deprecation")
 	void getAllAnnotationAttributesOnLangType() {
 		MultiValueMap<String, Object> attributes = getAllAnnotationAttributes(
-				org.springframework.lang.NonNullApi.class, Nonnull.class.getName());
-		assertThat(attributes).as("Annotation attributes map for @Nonnull on NonNullApi").isNotNull();
-		assertThat(attributes.get("when")).as("value for NonNullApi").isEqualTo(List.of(When.ALWAYS));
+				org.springframework.lang.NonNullApi.class, javax.annotation.Nonnull.class.getName());
+		assertThat(attributes).as("Annotation attributes map for @Nonnull on @NonNullApi").isNotNull();
+		assertThat(attributes.get("when")).as("value for @NonNullApi").isEqualTo(List.of(When.ALWAYS));
 	}
 
 	@Test
 	void getAllAnnotationAttributesOnJavaxType() {
-		MultiValueMap<String, Object> attributes = getAllAnnotationAttributes(
-				ParametersAreNonnullByDefault.class, Nonnull.class.getName());
-		assertThat(attributes).as("Annotation attributes map for @Nonnull on NonNullApi").isNotNull();
-		assertThat(attributes.get("when")).as("value for NonNullApi").isEqualTo(List.of(When.ALWAYS));
+		MultiValueMap<String, Object> attributes = getAllAnnotationAttributes(RegEx.class, Syntax.class.getName());
+		assertThat(attributes).as("Annotation attributes map for @Syntax on @RegEx").isNotNull();
+		assertThat(attributes.get("when")).as("value for @RegEx").isEqualTo(List.of(When.ALWAYS));
 	}
 
 	@Test
@@ -855,8 +855,10 @@ class AnnotatedElementUtilsTests {
 
 	@Test
 	void javaxMetaAnnotationTypeViaFindMergedAnnotation() {
-		assertThat(findMergedAnnotation(ParametersAreNonnullByDefault.class, Nonnull.class)).isEqualTo(ParametersAreNonnullByDefault.class.getAnnotation(Nonnull.class));
-		assertThat(findMergedAnnotation(ResourceHolder.class, Nonnull.class)).isEqualTo(ParametersAreNonnullByDefault.class.getAnnotation(Nonnull.class));
+		assertThat(findMergedAnnotation(ThreadSafe.class, Documented.class))
+				.isEqualTo(ThreadSafe.class.getAnnotation(Documented.class));
+		assertThat(findMergedAnnotation(ResourceHolder.class, TypeQualifierNickname.class))
+				.isEqualTo(RegEx.class.getAnnotation(TypeQualifierNickname.class));
 	}
 
 	@Test
@@ -1536,7 +1538,7 @@ class AnnotatedElementUtilsTests {
 	}
 
 	@Resource(name = "x")
-	@ParametersAreNonnullByDefault
+	@RegEx
 	static class ResourceHolder {
 	}
 
diff --git a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationFilterTests.java b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationFilterTests.java
index 8a48353d627..6bf99d15784 100644
--- a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationFilterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationFilterTests.java
@@ -19,9 +19,8 @@ package org.springframework.core.annotation;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
-import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
 
-import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.lang.Contract;
@@ -86,12 +85,13 @@ class AnnotationFilterTests {
 
 	@Test
 	void javaWhenJavaxAnnotationReturnsTrue() {
-		assertThat(AnnotationFilter.JAVA.matches(Nonnull.class)).isTrue();
+		assertThat(AnnotationFilter.JAVA.matches(ThreadSafe.class)).isTrue();
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void javaWhenSpringLangAnnotationReturnsFalse() {
-		assertThat(AnnotationFilter.JAVA.matches(Nullable.class)).isFalse();
+		assertThat(AnnotationFilter.JAVA.matches(org.springframework.lang.Nullable.class)).isFalse();
 	}
 
 	@Test
@@ -103,7 +103,7 @@ class AnnotationFilterTests {
 	@SuppressWarnings("deprecation")
 	void noneReturnsFalse() {
 		assertThat(AnnotationFilter.NONE.matches(Retention.class)).isFalse();
-		assertThat(AnnotationFilter.NONE.matches(Nullable.class)).isFalse();
+		assertThat(AnnotationFilter.NONE.matches(org.springframework.lang.Nullable.class)).isFalse();
 		assertThat(AnnotationFilter.NONE.matches(TestAnnotation.class)).isFalse();
 	}
 
diff --git a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationTypeMappingsTests.java b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationTypeMappingsTests.java
index a34e4f73ea9..0eac833cc5e 100644
--- a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationTypeMappingsTests.java
+++ b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationTypeMappingsTests.java
@@ -29,8 +29,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.IntStream;
 
-import javax.annotation.Nullable;
-
 import org.junit.jupiter.api.Test;
 
 import org.springframework.core.annotation.AnnotationTypeMapping.MirrorSets;
@@ -442,7 +440,7 @@ class AnnotationTypeMappingsTests {
 		return result;
 	}
 
-	private @Nullable Method getAliasMapping(AnnotationTypeMapping mapping, int attributeIndex) {
+	private Method getAliasMapping(AnnotationTypeMapping mapping, int attributeIndex) {
 		int mapped = mapping.getAliasMapping(attributeIndex);
 		return mapped != -1 ? mapping.getRoot().getAttributes().get(mapped) : null;
 	}
diff --git a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationUtilsTests.java b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationUtilsTests.java
index a38fba676bd..f1364c73cec 100644
--- a/spring-core/src/test/java/org/springframework/core/annotation/AnnotationUtilsTests.java
+++ b/spring-core/src/test/java/org/springframework/core/annotation/AnnotationUtilsTests.java
@@ -30,8 +30,9 @@ import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.Set;
 
-import javax.annotation.Nonnull;
-import javax.annotation.ParametersAreNonnullByDefault;
+import javax.annotation.RegEx;
+import javax.annotation.Syntax;
+import javax.annotation.concurrent.ThreadSafe;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -428,8 +429,8 @@ class AnnotationUtilsTests {
 	@Test
 	void isAnnotationMetaPresentForPlainType() {
 		assertThat(isAnnotationMetaPresent(Order.class, Documented.class)).isTrue();
-		assertThat(isAnnotationMetaPresent(ParametersAreNonnullByDefault.class, Documented.class)).isTrue();
-		assertThat(isAnnotationMetaPresent(ParametersAreNonnullByDefault.class, Nonnull.class)).isTrue();
+		assertThat(isAnnotationMetaPresent(ThreadSafe.class, Documented.class)).isTrue();
+		assertThat(isAnnotationMetaPresent(RegEx.class, Syntax.class)).isTrue();
 	}
 
 	@Test
diff --git a/src/checkstyle/checkstyle-suppressions.xml b/src/checkstyle/checkstyle-suppressions.xml
index ad2ca8f7b56..3fe0922a831 100644
--- a/src/checkstyle/checkstyle-suppressions.xml
+++ b/src/checkstyle/checkstyle-suppressions.xml
@@ -21,9 +21,6 @@
 	<!-- Framework docs -->
 	<suppress files="org[\\/]springframework[\\/]docs[\\/].+" checks="IllegalImport" id="bannedJUnitJupiterImports" />
 
-	<!-- spring-aop -->
-	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]aopalliance[\\/]" checks="IllegalImport" id="bannedImports" message="javax"/>
-
 	<!-- spring-beans -->
 	<suppress files="TypeMismatchException" checks="MutableException"/>
 	<suppress files="BeanCreationException" checks="MutableException"/>
@@ -40,9 +37,7 @@
 	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/](asm|cglib|objenesis|javapoet)[\\/]" checks=".*"/>
 	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]aot[\\/]nativex[\\/]feature[\\/]" checks="RegexpSinglelineJava" id="systemOutErrPrint"/>
 	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/](core|util)[\\/](SpringProperties|SystemPropertyUtils)" checks="RegexpSinglelineJava" id="systemOutErrPrint"/>
-	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]lang[\\/]" checks="IllegalImport" id="bannedImports" message="javax"/>
-	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]core[\\/]annotation[\\/]" checks="IllegalImport" id="bannedImports" message="javax"/>
-	<suppress files="[\\/]src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]core[\\/]annotation[\\/]" checks="IllegalImport" id="bannedImports" message="javax"/>
+	<suppress files="[\\/]src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]lang[\\/]NonNull.+" checks="IllegalImport" id="bannedNullabilityImports"/>
 	<suppress files="ByteArrayEncoder" checks="SpringLambda"/>
 	<suppress files="SocketUtils" checks="HideUtilityClassConstructor"/>
 	<suppress files="ResolvableType" checks="FinalClass"/>
diff --git a/src/checkstyle/checkstyle.xml b/src/checkstyle/checkstyle.xml
index d7ba423332f..e6947f32357 100644
--- a/src/checkstyle/checkstyle.xml
+++ b/src/checkstyle/checkstyle.xml
@@ -104,10 +104,20 @@
 			<property name="sortStaticImportsAlphabetically" value="true"/>
 		</module>
 		<module name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
-			<property name="id" value="bannedImports"/>
+			<property name="id" value="bannedReactorImports"/>
 			<property name="regexp" value="true"/>
-			<property name="illegalClasses"
-				value="^reactor\.core\.support\.Assert,^org\.slf4j\.LoggerFactory,^(?!org\.jspecify|\.annotations).*(NonNull|Nullable)$"/>
+			<property name="illegalClasses" value="^reactor\.core\.support\.Assert"/>
+		</module>
+		<module name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
+			<property name="id" value="bannedSlf4jImports"/>
+			<property name="regexp" value="true"/>
+			<property name="illegalClasses" value="^org\.slf4j\.LoggerFactory"/>
+		</module>
+		<module name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
+			<property name="id" value="bannedNullabilityImports"/>
+			<property name="regexp" value="true"/>
+			<!-- Rejects all NonNull, Nonnull, and Nullable types that are NOT in the org.jspecify.annotations package. -->
+			<property name="illegalClasses" value="^(?!org\.jspecify\.annotations).*(Non[Nn]ull|Nullable)$"/>
 		</module>
 		<module name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
 			<property name="id" value="bannedJUnit3Imports"/>