xwm1992 commented on issue #344:
URL: 
https://github.com/apache/incubator-eventmesh/issues/344#issuecomment-840977762


   > I submit PR to fix this issue. Please review. Thanks.
   > 
   > #345
   
   @jinrongluo Well, I try to recurring your problem,after use your pull 
request here still have the problem below.
   ```
   ConsumerManager(ConsumerManager.java:296) - onChange 
event:consumerGroupStateEvent={consumerGroup=1234-FT0,action=NEW} err
   java.lang.NullPointerException: null
   ```
   this NullPointerException problem occured when **EventMeshConsumer init()** 
use the **HTTPMessageHandler the code line 63** cause the exception. 
https://github.com/apache/incubator-eventmesh/blob/develop/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/core/protocol/http/push/HTTPMessageHandler.java
   
   Only enhance client registration in subscribeProcessor or 
unsubscribeProcessor cannot fundamentally solve the problem, please have a 
check, thank you


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