yuz10 opened a new issue #3175:
URL: https://github.com/apache/rocketmq/issues/3175


   **BUG REPORT**
   
   1. Please describe the issue you observed:
   
   - What did you do (The steps to reproduce)?
   `mqadmin  updateAclConfig -c RaftCluster -a aaaaaaaaaak `
   
   and then restart broker
   
   - What did you expect to see?
   restart success 
   
   - What did you see instead?
   broker start failed
   ```
   java.lang.ClassCastException: java.lang.Class cannot be cast to 
org.apache.rocketmq.acl.AccessValidator
        at 
org.apache.rocketmq.broker.BrokerController.initialAcl(BrokerController.java:516)
        at 
org.apache.rocketmq.broker.BrokerController.initialize(BrokerController.java:483)
        at 
org.apache.rocketmq.broker.BrokerStartup.createBrokerController(BrokerStartup.java:222)
        at org.apache.rocketmq.broker.BrokerStartup.main(BrokerStartup.java:58)
   ```
   
   
   2. Please tell us about your environment:
   
   3. Other information (e.g. detailed explanation, logs, related issues, 
suggestions how to fix, etc):
   


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