Fix annotation value mapping regression

Refine `TypeMappedAnnotation.getValueFromMetaAnnotation` to correctly
account for aliases when finding values from meta-annotations. Prior
to this commit, only convention based mappings were considered when
searching for values on meta-annotations. This meant that declared
meta-annotations that used aliases could return the "default value"
rather than the merged value.

Closes gh-22654

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

@@ -67,6 +67,10 @@ final class AnnotationTypeMapping {
 
 	private final int[] conventionMappings;
 
+	private final int[] annotationValueMappings;
+
+	private final AnnotationTypeMapping[] annotationValueSource;
+
 	private final Map<Method, List<Method>> aliasedBy;
 
 	private final Set<Method> claimedAliases = new HashSet<>();
@@ -92,9 +96,12 @@ final class AnnotationTypeMapping {
 		this.mirrorSets = new MirrorSets();
 		this.aliasMappings = filledIntArray(this.attributes.size(), -1);
 		this.conventionMappings = filledIntArray(this.attributes.size(), -1);
+		this.annotationValueMappings = filledIntArray(this.attributes.size(), -1);
+		this.annotationValueSource = new AnnotationTypeMapping[this.attributes.size()];
 		this.aliasedBy = resolveAliasedForTargets();
 		processAliases();
 		addConventionMappings();
+		addConventionAnnotationValues();
 	}
 
 
@@ -200,7 +207,7 @@ final class AnnotationTypeMapping {
 			aliases.add(this.attributes.get(i));
 			collectAliases(aliases);
 			if (aliases.size() > 1) {
-				processAliases(aliases);
+				processAliases(i, aliases);
 			}
 		}
 	}
@@ -219,7 +226,7 @@ final class AnnotationTypeMapping {
 		}
 	}
 
-	private void processAliases(List<Method> aliases) {
+	private void processAliases(int attributeIndex, List<Method> aliases) {
 		int rootAttributeIndex = getFirstRootAttributeIndex(aliases);
 		AnnotationTypeMapping mapping = this;
 		while (mapping != null) {
@@ -232,6 +239,16 @@ final class AnnotationTypeMapping {
 			}
 			mapping.mirrorSets.updateFrom(aliases);
 			mapping.claimedAliases.addAll(aliases);
+			if (mapping.annotation != null) {
+				int[] resolvedMirrors = mapping.mirrorSets.resolve(null,
+						mapping.annotation, ReflectionUtils::invokeMethod);
+				for (int i = 0; i < mapping.attributes.size(); i++) {
+					if (aliases.contains(mapping.attributes.get(i))) {
+						this.annotationValueMappings[attributeIndex] = resolvedMirrors[i];
+						this.annotationValueSource[attributeIndex] = mapping;
+					}
+				}
+			}
 			mapping = mapping.parent;
 		}
 	}
@@ -267,6 +284,22 @@ final class AnnotationTypeMapping {
 		}
 	}
 
+	private void addConventionAnnotationValues() {
+		for (int i = 0; i < this.attributes.size(); i++) {
+			Method attribute = this.attributes.get(i);
+			AnnotationTypeMapping mapping = this;
+			while (mapping.depth > 0) {
+				int mapped = mapping.getAttributes().indexOf(attribute.getName());
+				if (mapped != -1 && (this.annotationValueMappings[i] == -1
+						|| this.annotationValueSource[i].depth > mapping.depth)) {
+					this.annotationValueMappings[i] = mapped;
+					this.annotationValueSource[i] = mapping;
+				}
+				mapping = mapping.parent;
+			}
+		}
+	}
+
 	/**
 	 * Method called after all mappings have been set. At this point no further
 	 * lookups from child mappings will occur.
@@ -389,6 +422,26 @@ final class AnnotationTypeMapping {
 		return this.conventionMappings[attributeIndex];
 	}
 
+	/**
+	 * Return a mapped attribute value from the most suitable
+	 * {@link #getAnnotation() meta-annotation}. The resulting value is obtained
+	 * from the closest meta-annotation, taking into consideration both
+	 * convention and alias based mapping rules. For root mappings, this method
+	 * will always return {@code null}.
+	 * @param attributeIndex the attribute index of the source attribute
+	 * @return the mapped annotation value, or {@code null}
+	 */
+	@Nullable
+	Object getMappedAnnotationValue(int attributeIndex) {
+		int mapped = this.annotationValueMappings[attributeIndex];
+		if (mapped == -1) {
+			return null;
+		}
+		AnnotationTypeMapping source = this.annotationValueSource[attributeIndex];
+		return ReflectionUtils.invokeMethod(source.attributes.get(mapped),
+				source.annotation);
+	}
+
 	/**
 	 * Return if the specified value is equivalent to the default value of the
 	 * attribute at the given index.
@@ -615,5 +668,4 @@ final class AnnotationTypeMapping {
 		}
 
 	}
-
 }

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

@@ -140,7 +140,7 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 	private Object getValueForMirrorResolution(Method attribute, Object annotation) {
 		int attributeIndex = this.mapping.getAttributes().indexOf(attribute);
 		boolean valueAttribute = VALUE.equals(attribute.getName());
-		return getValue(attributeIndex, !valueAttribute, false);
+		return getValue(attributeIndex, !valueAttribute, true);
 	}
 
 	@Override
@@ -183,7 +183,7 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 	@Override
 	public boolean hasDefaultValue(String attributeName) {
 		int attributeIndex = getAttributeIndex(attributeName, true);
-		Object value = getValue(attributeIndex, true, true);
+		Object value = getValue(attributeIndex, true, false);
 		return value == null || this.mapping.isEquivalentToDefaultValue(attributeIndex, value,
 				this.valueExtractor);
 	}
@@ -371,7 +371,7 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 	@Nullable
 	private <T> T getValue(int attributeIndex, Class<T> type) {
 		Method attribute = this.mapping.getAttributes().get(attributeIndex);
-		Object value = getValue(attributeIndex, true, true);
+		Object value = getValue(attributeIndex, true, false);
 		if (value == null) {
 			value = attribute.getDefaultValue();
 		}
@@ -380,7 +380,8 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 
 	@Nullable
 	private Object getValue(int attributeIndex, boolean useConventionMapping,
-			boolean resolveMirrors) {
+			boolean forMirrorResolution) {
+
 		AnnotationTypeMapping mapping = this.mapping;
 		if (this.useMergedValues) {
 			int mappedIndex = this.mapping.getAliasMapping(attributeIndex);
@@ -392,7 +393,7 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 				attributeIndex = mappedIndex;
 			}
 		}
-		if (resolveMirrors) {
+		if (!forMirrorResolution) {
 			attributeIndex = (mapping.getDepth() != 0 ?
 					this.resolvedMirrors :
 					this.resolvedRootMirrors)[attributeIndex];
@@ -400,31 +401,22 @@ final class TypeMappedAnnotation<A extends Annotation> extends AbstractMergedAnn
 		if (attributeIndex == -1) {
 			return null;
 		}
-		Method attribute = mapping.getAttributes().get(attributeIndex);
 		if (mapping.getDepth() == 0) {
+			Method attribute = mapping.getAttributes().get(attributeIndex);
 			return this.valueExtractor.apply(attribute, this.rootAttributes);
 		}
-		return getValueFromMetaAnnotation(attribute);
+		return getValueFromMetaAnnotation(attributeIndex, forMirrorResolution);
 	}
 
 	@Nullable
-	private Object getValueFromMetaAnnotation(Method attribute) {
-		AnnotationTypeMapping mapping = this.mapping;
-		if (this.useMergedValues && !VALUE.equals(attribute.getName())) {
-			AnnotationTypeMapping candidate = mapping;
-			while (candidate != null && candidate.getDepth() > 0) {
-				int attributeIndex = candidate.getAttributes().indexOf(attribute.getName());
-				if (attributeIndex != -1) {
-					Method candidateAttribute = candidate.getAttributes().get(attributeIndex);
-					if (candidateAttribute.getReturnType().equals(attribute.getReturnType())) {
-						mapping = candidate;
-						attribute = candidateAttribute;
-					}
-				}
-				candidate = candidate.getParent();
-			}
+	private Object getValueFromMetaAnnotation(int attributeIndex,
+			boolean forMirrorResolution) {
+
+		if (this.useMergedValues && !forMirrorResolution) {
+			return this.mapping.getMappedAnnotationValue(attributeIndex);
 		}
-		return ReflectionUtils.invokeMethod(attribute, mapping.getAnnotation());
+		Method attribute = this.mapping.getAttributes().get(attributeIndex);
+		return ReflectionUtils.invokeMethod(attribute, this.mapping.getAnnotation());
 	}
 
 	@SuppressWarnings("unchecked")

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

@@ -2036,6 +2036,25 @@ public class MergedAnnotationsTests {
 		assertThat(annotation.getString("text")).isEqualTo("metameta");
 	}
 
+	@Test // gh-22654
+	public void getValueWhenHasDefaultOverrideWithImplicitAlias() {
+		MergedAnnotation<?> annotation1 = MergedAnnotations.from(
+				DefaultOverrideImplicitAliasMetaClass1.class).get(DefaultOverrideRoot.class);
+		assertThat(annotation1.getString("text")).isEqualTo("alias-meta-1");
+		MergedAnnotation<?> annotation2 = MergedAnnotations.from(
+				DefaultOverrideImplicitAliasMetaClass2.class).get(DefaultOverrideRoot.class);
+		assertThat(annotation2.getString("text")).isEqualTo("alias-meta-2");
+	}
+
+	@Test // gh-22654
+	public void getValueWhenHasDefaultOverrideWithExplicitAlias() {
+		MergedAnnotation<?> annotation = MergedAnnotations.from(
+				DefaultOverrideExplicitAliasRootMetaMetaClass.class).get(
+						DefaultOverrideExplicitAliasRoot.class);
+		assertThat(annotation.getString("text")).isEqualTo("meta");
+		assertThat(annotation.getString("value")).isEqualTo("meta");
+	}
+
 	// @formatter:off
 
 	@Retention(RetentionPolicy.RUNTIME)
@@ -3359,6 +3378,68 @@ public class MergedAnnotationsTests {
 
 	}
 
+	@Retention(RetentionPolicy.RUNTIME)
+	@DefaultOverrideRoot
+	@interface DefaultOverrideImplicitAlias {
+
+		@AliasFor(annotation=DefaultOverrideRoot.class, attribute="text")
+		String text1() default "alias";
+
+		@AliasFor(annotation=DefaultOverrideRoot.class, attribute="text")
+		String text2() default "alias";
+
+	}
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@DefaultOverrideImplicitAlias(text1="alias-meta-1")
+	@interface DefaultOverrideAliasImplicitMeta1 {
+
+	}
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@DefaultOverrideImplicitAlias(text2="alias-meta-2")
+	@interface DefaultOverrideImplicitAliasMeta2 {
+
+	}
+
+	@DefaultOverrideAliasImplicitMeta1
+	static class DefaultOverrideImplicitAliasMetaClass1 {
+
+	}
+
+	@DefaultOverrideImplicitAliasMeta2
+	static class DefaultOverrideImplicitAliasMetaClass2 {
+
+	}
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface DefaultOverrideExplicitAliasRoot {
+
+		@AliasFor("value")
+		String text() default "";
+
+		@AliasFor("text")
+		String value() default "";
+
+	}
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@DefaultOverrideExplicitAliasRoot("meta")
+	@interface DefaultOverrideExplicitAliasRootMeta {
+
+	}
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@DefaultOverrideExplicitAliasRootMeta
+	@interface DefaultOverrideExplicitAliasRootMetaMeta {
+
+	}
+
+	@DefaultOverrideExplicitAliasRootMetaMeta
+	static class DefaultOverrideExplicitAliasRootMetaMetaClass {
+
+	}
+
 	// @formatter:on
 
 }