@Import detects and accepts existing configuration class of the desired type

org.springframework.context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java

@@ -129,6 +129,24 @@ final class ConfigurationClass {
 	}
 
 
+	@Override
+	public boolean equals(Object other) {
+		if (this == other) {
+			return true;
+		}
+		if (!(other instanceof ConfigurationClass)) {
+			return false;
+		}
+		ConfigurationClass otherCc = (ConfigurationClass) other;
+		return getMetadata().getClassName().equals(otherCc.getMetadata().getClassName());
+	}
+
+	@Override
+	public int hashCode() {
+		return getMetadata().getClassName().hashCode();
+	}
+
+
 	/** Configuration classes must be non-final to accommodate CGLIB subclassing. */
 	private class FinalConfigurationProblem extends Problem {
 

org.springframework.context/src/main/java/org/springframework/context/annotation/ConfigurationClassBeanDefinitionReader.java

@@ -99,7 +99,7 @@ class ConfigurationClassBeanDefinitionReader {
 		if (configClass.getBeanName() == null) {
 			GenericBeanDefinition configBeanDef = new GenericBeanDefinition();
 			configBeanDef.setBeanClassName(configClass.getMetadata().getClassName());
-			String configBeanName = BeanDefinitionReaderUtils.registerWithGeneratedName(configBeanDef, registry);
+			String configBeanName = BeanDefinitionReaderUtils.registerWithGeneratedName(configBeanDef, this.registry);
 			configClass.setBeanName(configBeanName);
 			if (logger.isDebugEnabled()) {
 				logger.debug(String.format("Registered bean definition for imported @Configuration class %s", configBeanName));
@@ -109,7 +109,7 @@ class ConfigurationClassBeanDefinitionReader {
 
 	/**
 	 * Reads a particular {@link ConfigurationClassMethod}, registering bean definitions with
-	 * {@link #registry} based on its contents.
+	 * the BeanDefinitionRegistry based on its contents.
 	 */
 	private void loadBeanDefinitionsForModelMethod(ConfigurationClassMethod method) {
 		ConfigurationClass configClass = method.getDeclaringClass();