yitian108 commented on issue #9796:
URL: https://github.com/apache/pulsar/issues/9796#issuecomment-803713027


   Great. Thanks for your help.
   
    According to your advice, I recorrect the returned type of callback to 
void, it really could work in my IDE, however, for the first program that I 
list in front of the topic, I used the void as the returned type, but it will 
report segment fault, why?
   
   So, I planed to change the gcc version in command line, indeed, when I 
change the g++ to 4.8.5, it could work, that's to say, the sendSync() couldn't 
work well in g++ 9.3.1, isn't it?
    
   


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