[GitHub] [skywalking] zhaoyuguang edited a comment on issue #3392: Webflux plugin throw ClassCastException when defining a filter

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zhaoyuguang edited a comment on issue #3392: Webflux plugin throw ClassCastException when defining a filter
URL: https://github.com/apache/skywalking/issues/3392#issuecomment-526986615
 
 
   `ServerWebExchange` is a Interface 
   ![image](https://user-images.githubusercontent.com/10150229/64087987-e2b4a980-cd71-11e9-8e65-7c6106e557c6.png)
   now SkyWalking Webflux Plugin only enhance `DefaultServerWebExchange`
   In this case the interceptor `DispatcherHandlerHandleMethodInterceptor` throw `ClassCastException`
   ![image](https://user-images.githubusercontent.com/10150229/64088028-1db6dd00-cd72-11e9-86f5-6cd1e7dd6d0f.png)
   Because DefaultServerWebExchange at `delegate`
   
   After we use 
   ```java
   public class DefaultServerWebExchangeInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
   
       @Override
       protected ClassMatch enhanceClass() {
           return byHierarchyMatch(new String[] {"org.springframework.web.server.ServerWebExchange"});
       }
       ......
   }
   ```
   The enhance class inner look like:
   ![image](https://user-images.githubusercontent.com/10150229/64087659-8d2bcd00-cd70-11e9-9b22-111b040c4718.png)
   ![image](https://user-images.githubusercontent.com/10150229/64087964-d0d30680-cd71-11e9-89ca-8dce6a55d351.png)
   

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