Introduce regression test for gh-24375

spring-context/src/test/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProviderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 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.
@@ -42,6 +42,7 @@ import org.junit.Test;
 
 import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.componentscan.gh24375.MyComponent;
 import org.springframework.context.index.CandidateComponentsTestClassLoader;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.StandardEnvironment;
@@ -501,6 +502,15 @@ public class ClassPathScanningCandidateComponentProviderTests {
 		}
 	}
 
+	@Test
+	public void gh24375() {
+		ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
+		Set<BeanDefinition> components = provider.findCandidateComponents(MyComponent.class.getPackage().getName());
+		assertEquals(1, components.size());
+		assertEquals(MyComponent.class.getName(), components.iterator().next().getBeanClassName());
+	}
+
+
 	private boolean containsBeanClass(Set<BeanDefinition> candidates, Class<?> beanClass) {
 		for (BeanDefinition candidate : candidates) {
 			if (beanClass.getName().equals(candidate.getBeanClassName())) {

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/A.java

@@ -0,0 +1,35 @@
+/*
+ * 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.
+ * 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.context.annotation.componentscan.gh24375;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.core.annotation.AliasFor;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface A {
+
+	@AliasFor("value")
+	B other() default @B;
+
+	@AliasFor("other")
+	B value() default @B;
+}

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/B.java

@@ -0,0 +1,29 @@
+/*
+ * 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.
+ * 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.context.annotation.componentscan.gh24375;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.ANNOTATION_TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface B {
+
+	String name() default "";
+}

spring-context/src/test/java/org/springframework/context/annotation/componentscan/gh24375/MyComponent.java

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ * 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.context.annotation.componentscan.gh24375;
+
+import org.springframework.stereotype.Component;
+
+@Component
+@A(other = @B)
+public class MyComponent {
+}