mino181295 opened a new pull request #2346:
URL: https://github.com/apache/bookkeeper/pull/2346


   ### Motivation
   
   `com.google.common.base.Optional` and `java.util.Optional` exist in the code 
base at the same time.
   
   ### Changes
   - Replace `com.google.common.base.Optional` with `java.util.Optional`.
   - Add checkstyle rule to avoid the com.google.common.base.Optional import
   


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