GitHub user AlbumenJ added a comment to the discussion: [Q/A]The parameters in 
Dubbo's RPC calls are passed by value.

In a RPC system, request and response are being serialized into bytes. So, you 
cannot change the request in provider side.
For this case, you can pass the result in RpcContext. 

https://dubbo.apache.org/en/overview/mannual/java-sdk/tasks/framework/attachment/

GitHub link: 
https://github.com/apache/dubbo/discussions/15372#discussioncomment-13168268

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