[NIFI-8394] Fix NPE error when NiFi connects to external zookeeper insecurely

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.13.0, 1.13.1, 1.13.2
• Fix Version/s: 1.14.0
• Component/s: Core Framework
• Labels: zookeeper
• Assignee: Nadeem
• Reporter: Nadeem
• Created: 06/Apr/21 08:36
• Updated: 07/Apr/21 19:49
• Resolved: 07/Apr/21 19:49

Description

When NiFi connects to external zookeeper insecurely, then following error is logged due to null watcher passed in zookeeper constructor. This error is introduced due to changes made for adding zookeeper client with TLS NIFI-7819

ERROR [Framework Task Thread Thread-3-EventThread] org.apache.zookeeper.ClientCnxn Error while calling watcher
java.lang.NullPointerException: null
        at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)

Issue Links

• is related to: ZOOKEEPER-1875 NullPointerException in ClientCnxn$EventThread.processEvent
• links to: GitHub Pull Request #4974