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From GitBox <...@apache.org>
Subject [GitHub] [dubbo] kylixs edited a comment on issue #8221: dubbo consumer端对 方法自定义引入引发启动报错
Date Tue, 06 Jul 2021 11:42:08 GMT

kylixs edited a comment on issue #8221:
URL: https://github.com/apache/dubbo/issues/8221#issuecomment-873919884


   > 1.在某个controller中 对roleAuthorizationService引用
   > @DubboReference(timeout = 50000)
   > private RoleAuthorizationService roleAuthorizationService;
   > 2. 在另一个controller中 对roleAuthorizationService引用
   > @DubboReference
   > private RoleAuthorizationService roleAuthorizationService;
   
   这两个地方都是初始化Reference并注入field,但是两个注解的属性不相同,提示相同的beanName但不同的属性的错误,因为无法决定使用哪个注解定义的属性来创建reference对象。
   
   正确的用法是:
   (1) Dubbo 3 之后推荐将reference定义和注入分开, 如可以在一个Java Config类中定义reference,在引用的类中通过`@Autowired`来注入接口代理类。
   定义reference:
   ```
   @Configuration
   class ConsumerConfig {
       @Bean
       @DubboReference(timeout = 50000)
       public ReferenceBean<RoleAuthorizationService> roleAuthorizationService (){
             return new ReferenceBean();
       }
   }
   ```
   或者
   ```
   @Configuration
   class ConsumerConfig {
       @DubboReference(timeout = 50000)
       private RoleAuthorizationService roleAuthorizationService;
   }
   ```
   
   
   注入接口:
   ```
   class FooController {
   
       @Autowired
       private RoleAuthorizationService roleAuthorizationService;
      
      ...
   }
   ```
   
   (2) 兼容Dubbo 2的方式,保证所有相同的reference的@DubboReference注解属性相同,那么最终只会创建一个reference对象,不会出现上面的错误。
   上面的例子应该都修改为: 
   ```
   class FooController {
       ...
       @DubboReference(timeout = 50000)
       private RoleAuthorizationService roleAuthorizationService;
       ...
   }
   ```
   ```
   class BarController {
       ...
       @DubboReference(timeout = 50000)
       private RoleAuthorizationService roleAuthorizationService;
       ...
   }
   ```
   
   


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