supercym opened a new issue, #273:
URL: https://github.com/apache/rocketmq-clients/issues/273

   I use 5.0 sdk but refer to how 4.0 is used (like here: 
https://help.aliyun.com/document_detail/446709.html)
   
   When my instanceUsername and password are both null and I access the Alibaba 
Cloud MQ instance from vpc, there is an NPE.
   
   
![image](https://user-images.githubusercontent.com/25047893/199150885-3ff9f3d8-8305-4be2-a9da-7da23a4db10d.png)
   


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