Revert "Support recursive annotations in merged annotations"

This reverts commit 3ec612aaf8.

spring-core/src/main/java/org/springframework/core/annotation/AnnotationTypeMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -82,8 +82,8 @@ final class AnnotationTypeMapping {
 	private final Set<Method> claimedAliases = new HashSet<>();
 
 
-	AnnotationTypeMapping(@Nullable AnnotationTypeMapping source, Class<? extends Annotation> annotationType,
-			@Nullable Annotation annotation, Set<Class<? extends Annotation>> visitedAnnotationTypes) {
+	AnnotationTypeMapping(@Nullable AnnotationTypeMapping source,
+			Class<? extends Annotation> annotationType, @Nullable Annotation annotation) {
 
 		this.source = source;
 		this.root = (source != null ? source.getRoot() : this);
@@ -103,7 +103,7 @@ final class AnnotationTypeMapping {
 		processAliases();
 		addConventionMappings();
 		addConventionAnnotationValues();
-		this.synthesizable = computeSynthesizableFlag(visitedAnnotationTypes);
+		this.synthesizable = computeSynthesizableFlag();
 	}
 
 
@@ -311,10 +311,7 @@ final class AnnotationTypeMapping {
 	}
 
 	@SuppressWarnings("unchecked")
-	private boolean computeSynthesizableFlag(Set<Class<? extends Annotation>> visitedAnnotationTypes) {
-		// Track that we have visited the current annotation type.
-		visitedAnnotationTypes.add(this.annotationType);
-
+	private boolean computeSynthesizableFlag() {
 		// Uses @AliasFor for local aliases?
 		for (int index : this.aliasMappings) {
 			if (index != -1) {
@@ -343,15 +340,9 @@ final class AnnotationTypeMapping {
 				if (type.isAnnotation() || (type.isArray() && type.getComponentType().isAnnotation())) {
 					Class<? extends Annotation> annotationType =
 							(Class<? extends Annotation>) (type.isAnnotation() ? type : type.getComponentType());
-					// Ensure we have not yet visited the current nested annotation type, in order
-					// to avoid infinite recursion for JVM languages other than Java that support
-					// recursive annotation definitions.
-					if (visitedAnnotationTypes.add(annotationType)) {
-						AnnotationTypeMapping mapping =
-								AnnotationTypeMappings.forAnnotationType(annotationType, visitedAnnotationTypes).get(0);
-						if (mapping.isSynthesizable()) {
-							return true;
-						}
+					AnnotationTypeMapping mapping = AnnotationTypeMappings.forAnnotationType(annotationType).get(0);
+					if (mapping.isSynthesizable()) {
+						return true;
 					}
 				}
 			}

spring-core/src/main/java/org/springframework/core/annotation/AnnotationTypeMappings.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2020 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 +20,8 @@ import java.lang.annotation.Annotation;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Deque;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 
 import org.springframework.lang.Nullable;
 import org.springframework.util.ConcurrentReferenceHashMap;
@@ -42,7 +40,6 @@ import org.springframework.util.ConcurrentReferenceHashMap;
  * be searched once, regardless of how many times they are actually used.
  *
  * @author Phillip Webb
- * @author Sam Brannen
  * @since 5.2
  * @see AnnotationTypeMapping
  */
@@ -63,22 +60,19 @@ final class AnnotationTypeMappings {
 
 
 	private AnnotationTypeMappings(RepeatableContainers repeatableContainers,
-			AnnotationFilter filter, Class<? extends Annotation> annotationType,
-			Set<Class<? extends Annotation>> visitedAnnotationTypes) {
+			AnnotationFilter filter, Class<? extends Annotation> annotationType) {
 
 		this.repeatableContainers = repeatableContainers;
 		this.filter = filter;
 		this.mappings = new ArrayList<>();
-		addAllMappings(annotationType, visitedAnnotationTypes);
+		addAllMappings(annotationType);
 		this.mappings.forEach(AnnotationTypeMapping::afterAllMappingsSet);
 	}
 
 
-	private void addAllMappings(Class<? extends Annotation> annotationType,
-			Set<Class<? extends Annotation>> visitedAnnotationTypes) {
-
+	private void addAllMappings(Class<? extends Annotation> annotationType) {
 		Deque<AnnotationTypeMapping> queue = new ArrayDeque<>();
-		addIfPossible(queue, null, annotationType, null, visitedAnnotationTypes);
+		addIfPossible(queue, null, annotationType, null);
 		while (!queue.isEmpty()) {
 			AnnotationTypeMapping mapping = queue.removeFirst();
 			this.mappings.add(mapping);
@@ -108,15 +102,14 @@ final class AnnotationTypeMappings {
 	}
 
 	private void addIfPossible(Deque<AnnotationTypeMapping> queue, AnnotationTypeMapping source, Annotation ann) {
-		addIfPossible(queue, source, ann.annotationType(), ann, new HashSet<>());
+		addIfPossible(queue, source, ann.annotationType(), ann);
 	}
 
 	private void addIfPossible(Deque<AnnotationTypeMapping> queue, @Nullable AnnotationTypeMapping source,
-			Class<? extends Annotation> annotationType, @Nullable Annotation ann,
-			Set<Class<? extends Annotation>> visitedAnnotationTypes) {
+			Class<? extends Annotation> annotationType, @Nullable Annotation ann) {
 
 		try {
-			queue.addLast(new AnnotationTypeMapping(source, annotationType, ann, visitedAnnotationTypes));
+			queue.addLast(new AnnotationTypeMapping(source, annotationType, ann));
 		}
 		catch (Exception ex) {
 			AnnotationUtils.rethrowAnnotationConfigurationException(ex);
@@ -173,37 +166,20 @@ final class AnnotationTypeMappings {
 	 * @return type mappings for the annotation type
 	 */
 	static AnnotationTypeMappings forAnnotationType(Class<? extends Annotation> annotationType) {
-		return forAnnotationType(annotationType, new HashSet<>());
-	}
-
-	/**
-	 * Create {@link AnnotationTypeMappings} for the specified annotation type.
-	 * @param annotationType the source annotation type
-	 * @param visitedAnnotationTypes the set of annotations that we have already
-	 * visited; used to avoid infinite recursion for recursive annotations which
-	 * some JVM languages support (such as Kotlin)
-	 * @return type mappings for the annotation type
-	 */
-	static AnnotationTypeMappings forAnnotationType(Class<? extends Annotation> annotationType,
-			Set<Class<? extends Annotation>> visitedAnnotationTypes) {
-
-		return forAnnotationType(annotationType, RepeatableContainers.standardRepeatables(),
-				AnnotationFilter.PLAIN, visitedAnnotationTypes);
+		return forAnnotationType(annotationType, AnnotationFilter.PLAIN);
 	}
 
 	/**
 	 * Create {@link AnnotationTypeMappings} for the specified annotation type.
 	 * @param annotationType the source annotation type
-	 * @param repeatableContainers the repeatable containers that may be used by
-	 * the meta-annotations
 	 * @param annotationFilter the annotation filter used to limit which
 	 * annotations are considered
 	 * @return type mappings for the annotation type
 	 */
-	static AnnotationTypeMappings forAnnotationType(Class<? extends Annotation> annotationType,
-			RepeatableContainers repeatableContainers, AnnotationFilter annotationFilter) {
+	static AnnotationTypeMappings forAnnotationType(
+			Class<? extends Annotation> annotationType, AnnotationFilter annotationFilter) {
 
-		return forAnnotationType(annotationType, repeatableContainers, annotationFilter, new HashSet<>());
+		return forAnnotationType(annotationType, RepeatableContainers.standardRepeatables(), annotationFilter);
 	}
 
 	/**
@@ -213,24 +189,20 @@ final class AnnotationTypeMappings {
 	 * the meta-annotations
 	 * @param annotationFilter the annotation filter used to limit which
 	 * annotations are considered
-	 * @param visitedAnnotationTypes the set of annotations that we have already
-	 * visited; used to avoid infinite recursion for recursive annotations which
-	 * some JVM languages support (such as Kotlin)
 	 * @return type mappings for the annotation type
 	 */
-	private static AnnotationTypeMappings forAnnotationType(Class<? extends Annotation> annotationType,
-			RepeatableContainers repeatableContainers, AnnotationFilter annotationFilter,
-			Set<Class<? extends Annotation>> visitedAnnotationTypes) {
+	static AnnotationTypeMappings forAnnotationType(Class<? extends Annotation> annotationType,
+			RepeatableContainers repeatableContainers, AnnotationFilter annotationFilter) {
 
 		if (repeatableContainers == RepeatableContainers.standardRepeatables()) {
 			return standardRepeatablesCache.computeIfAbsent(annotationFilter,
-					key -> new Cache(repeatableContainers, key)).get(annotationType, visitedAnnotationTypes);
+					key -> new Cache(repeatableContainers, key)).get(annotationType);
 		}
 		if (repeatableContainers == RepeatableContainers.none()) {
 			return noRepeatablesCache.computeIfAbsent(annotationFilter,
-					key -> new Cache(repeatableContainers, key)).get(annotationType, visitedAnnotationTypes);
+					key -> new Cache(repeatableContainers, key)).get(annotationType);
 		}
-		return new AnnotationTypeMappings(repeatableContainers, annotationFilter, annotationType, visitedAnnotationTypes);
+		return new AnnotationTypeMappings(repeatableContainers, annotationFilter, annotationType);
 	}
 
 	static void clearCache() {
@@ -263,21 +235,14 @@ final class AnnotationTypeMappings {
 		/**
 		 * Get or create {@link AnnotationTypeMappings} for the specified annotation type.
 		 * @param annotationType the annotation type
-		 * @param visitedAnnotationTypes the set of annotations that we have already
-		 * visited; used to avoid infinite recursion for recursive annotations which
-		 * some JVM languages support (such as Kotlin)
 		 * @return a new or existing {@link AnnotationTypeMappings} instance
 		 */
-		AnnotationTypeMappings get(Class<? extends Annotation> annotationType,
-				Set<Class<? extends Annotation>> visitedAnnotationTypes) {
-
-			return this.mappings.computeIfAbsent(annotationType, key -> createMappings(key, visitedAnnotationTypes));
+		AnnotationTypeMappings get(Class<? extends Annotation> annotationType) {
+			return this.mappings.computeIfAbsent(annotationType, this::createMappings);
 		}
 
-		private AnnotationTypeMappings createMappings(Class<? extends Annotation> annotationType,
-				Set<Class<? extends Annotation>> visitedAnnotationTypes) {
-
-			return new AnnotationTypeMappings(this.repeatableContainers, this.filter, annotationType, visitedAnnotationTypes);
+		AnnotationTypeMappings createMappings(Class<? extends Annotation> annotationType) {
+			return new AnnotationTypeMappings(this.repeatableContainers, this.filter, annotationType);
 		}
 	}
 

spring-core/src/test/java/org/springframework/core/annotation/AnnotationTypeMappingsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -80,7 +80,7 @@ class AnnotationTypeMappingsTests {
 	@Test
 	void forAnnotationTypeWhenRepeatableMetaAnnotationIsFiltered() {
 		AnnotationTypeMappings mappings = AnnotationTypeMappings.forAnnotationType(WithRepeatedMetaAnnotations.class,
-				RepeatableContainers.standardRepeatables(), Repeating.class.getName()::equals);
+				Repeating.class.getName()::equals);
 		assertThat(getAll(mappings)).flatExtracting(AnnotationTypeMapping::getAnnotationType)
 				.containsExactly(WithRepeatedMetaAnnotations.class);
 	}

spring-core/src/test/kotlin/org/springframework/core/annotation/Filter.kt

@@ -1,35 +0,0 @@
-/*
- * Copyright 2002-2022 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.core.annotation
-
-/**
- * @author Sam Brannen
- * @since 5.3.16
- */
-@Target(AnnotationTarget.FUNCTION)
-@Retention(AnnotationRetention.RUNTIME)
-public annotation class Filter(
-
-	@get:AliasFor("name")
-	val value: String = "",
-
-	@get:AliasFor("value")
-	val name: String = "",
-
-	val and: Filters = Filters()
-
-)

spring-core/src/test/kotlin/org/springframework/core/annotation/Filters.kt

@@ -1,29 +0,0 @@
-/*
- * Copyright 2002-2022 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.core.annotation
-
-/**
- * @author Sam Brannen
- * @since 5.3.16
- */
-@Target(AnnotationTarget.FUNCTION)
-@Retention(AnnotationRetention.RUNTIME)
-public annotation class Filters(
-
-	vararg val value: Filter
-
-)

spring-core/src/test/kotlin/org/springframework/core/annotation/KotlinMergedAnnotationsTests.kt

@@ -1,105 +0,0 @@
-/*
- * Copyright 2002-2022 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.core.annotation
-
-import org.assertj.core.api.Assertions.assertThat
-import org.junit.jupiter.api.Test
-import org.springframework.core.annotation.MergedAnnotations
-import org.springframework.core.annotation.MergedAnnotation
-
-/**
- * Tests for {@link MergedAnnotations} and {@link MergedAnnotation} in Kotlin.
- *
- * @author Sam Brannen
- * @since 5.3.16
- */
-class KotlinMergedAnnotationsTests {
-
-	@Test  // gh-28012
-	fun recursiveAnnotation() {
-		val method = javaClass.getMethod("personMethod")
-
-		// MergedAnnotations
-		val mergedAnnotations = MergedAnnotations.from(method)
-		assertThat(mergedAnnotations.isPresent(Person::class.java)).isTrue();
-
-		// MergedAnnotation
-		val mergedAnnotation = MergedAnnotation.from(method.getAnnotation(Person::class.java))
-		assertThat(mergedAnnotation).isNotNull();
-
-		// Synthesized Annotations
-		val jane = mergedAnnotation.synthesize()
-		assertThat(jane).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(jane.value).isEqualTo("jane")
-		assertThat(jane.name).isEqualTo("jane")
-		val synthesizedFriends = jane.friends
-		assertThat(synthesizedFriends).hasSize(2)
-
-		val john = synthesizedFriends[0]
-		assertThat(john).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(john.value).isEqualTo("john")
-		assertThat(john.name).isEqualTo("john")
-
-		val sally = synthesizedFriends[1]
-		assertThat(sally).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(sally.value).isEqualTo("sally")
-		assertThat(sally.name).isEqualTo("sally")
-	}
-
-	@Test  // gh-28012
-	fun recursiveNestedAnnotation() {
-		val method = javaClass.getMethod("filterMethod")
-
-		// MergedAnnotations
-		val mergedAnnotations = MergedAnnotations.from(method)
-		assertThat(mergedAnnotations.isPresent(Filter::class.java)).isTrue();
-
-		// MergedAnnotation
-		val mergedAnnotation = MergedAnnotation.from(method.getAnnotation(Filter::class.java))
-		assertThat(mergedAnnotation).isNotNull();
-
-		// Synthesized Annotations
-		val fooFilter = mergedAnnotation.synthesize()
-		assertThat(fooFilter).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(fooFilter.value).isEqualTo("foo")
-		assertThat(fooFilter.name).isEqualTo("foo")
-		val filters = fooFilter.and
-		assertThat(filters.value).hasSize(2)
-
-		val barFilter = filters.value[0]
-		assertThat(barFilter).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(barFilter.value).isEqualTo("bar")
-		assertThat(barFilter.name).isEqualTo("bar")
-		assertThat(barFilter.and.value).isEmpty()
-
-		val bazFilter = filters.value[1]
-		assertThat(bazFilter).isInstanceOf(SynthesizedAnnotation::class.java)
-		assertThat(bazFilter.value).isEqualTo("baz")
-		assertThat(bazFilter.name).isEqualTo("baz")
-		assertThat(bazFilter.and.value).isEmpty()
-	}
-
-
-	@Person("jane", friends = [Person("john"), Person("sally")])
-	fun personMethod() {
-	}
-
-	@Filter("foo", and = Filters(Filter("bar"), Filter("baz")))
-	fun filterMethod() {
-	}
-
-}

spring-core/src/test/kotlin/org/springframework/core/annotation/Person.kt

@@ -1,35 +0,0 @@
-/*
- * Copyright 2002-2022 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.core.annotation
-
-/**
- * @author Sam Brannen
- * @since 5.3.16
- */
-@Target(AnnotationTarget.FUNCTION)
-@Retention(AnnotationRetention.RUNTIME)
-public annotation class Person(
-
-	@get:AliasFor("name")
-	val value: String = "",
-
-	@get:AliasFor("value")
-	val name: String = "",
-
-	vararg val friends: Person = []
-
-)