Do not consider all @Components as configuration

Update ConfigurationClassUtils to only consider beans with @Bean
methods as 'lite' configuration candidates.

Prior to this commit all @Component beans were considered 'lite'
configuration candidates which could result in a large number of
ConfigurationClass instance being created that would ultimately be
ignored.

Issue: SPR-10609

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassUtils.java

@@ -27,7 +27,6 @@ import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.core.type.StandardAnnotationMetadata;
 import org.springframework.core.type.classreading.MetadataReader;
 import org.springframework.core.type.classreading.MetadataReaderFactory;
-import org.springframework.stereotype.Component;
 
 /**
  * Utilities for processing @{@link Configuration} classes.
@@ -105,7 +104,6 @@ abstract class ConfigurationClassUtils {
 			return false; // do not consider an interface or an annotation
 		}
 		return metadata.isAnnotated(Import.class.getName()) ||
-				metadata.isAnnotated(Component.class.getName()) ||
 				metadata.hasAnnotatedMethods(Bean.class.getName());
 	}
 

spring-context/src/test/java/org/springframework/context/annotation/componentscan/simple/SimpleComponent.java

@@ -16,9 +16,15 @@
 
 package org.springframework.context.annotation.componentscan.simple;
 
+import org.springframework.context.annotation.Bean;
 import org.springframework.stereotype.Component;
 
 @Component
 public class SimpleComponent {
 
+	@Bean
+	public String exampleBean() {
+		return "example";
+	}
+
 }