8月3日

spring-framework-main/spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanDefinition.java

@@ -1174,7 +1174,9 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	 * @throws BeanDefinitionValidationException in case of validation failure
 	 */
 	protected void prepareMethodOverride(MethodOverride mo) throws BeanDefinitionValidationException {
+		// 获取对应类中对应方法的个数
 		int count = ClassUtils.getMethodCountForName(getBeanClass(), mo.getMethodName());
+		// 等于0抛出异常。上面已经验证有方法需要覆盖，这里为0肯定错误
 		if (count == 0) {
 			throw new BeanDefinitionValidationException(
 					"Invalid method override: no method with name '" + mo.getMethodName() +
@@ -1182,6 +1184,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 		}
 		else if (count == 1) {
 			// Mark override as not overloaded, to avoid the overhead of arg type checking.
+			// 标记MethodOverride暂未被覆盖，避免参数类型检查开销
 			mo.setOverloaded(false);
 		}
 	}