glinggit commented on issue #768: The NullPointerException in the 
PlainAccessValidator#parse() method
URL: https://github.com/apache/rocketmq/issues/768#issuecomment-464353034
 
 
   When I send a message without passing the RPCHook value,
   
   The desired result is that there is no operational permission.
   
   But the server throws a nullPointerException.
   
   
   It is recommended to judge whether 'request.getExtFields()' is empty in the 
method PlainAccessValidator#parse(), and to give a default value if it is empty.

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