TisonKun commented on issue #1120: ZOOKEEPER-3579: Handle null default watcher gracefully URL: https://github.com/apache/zookeeper/pull/1120#issuecomment-545250253 Besides, it is effectively final since we set it exactly once, although the initialization are separated as ```java watchManager = defaultWatchManager(); watchManager.defaultWatcher = watcher; ``` we can do further factor but let's do it as a follow up.
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