[ZOOKEEPER-2966] Flaky NullPointerException while closing client connection

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Cannot Reproduce
• Affects Version/s: 3.5.3
• Component/s: java client
• Assignee: Unassigned
• Reporter: Enrico Olivelli
• Created: 17/Jan/18 08:04
• Updated: 07/Aug/23 17:25
• Resolved: 28/Feb/19 13:20

Description

It is not always reproducible, I get this in system tests of client applications.

ZK client 3.5.3, stacktrace self-explains

java.lang.NullPointerException
    at org.apache.zookeeper.ClientCnxnSocketNetty.onClosing(ClientCnxnSocketNetty.java:206)
    at org.apache.zookeeper.ClientCnxn$SendThread.close(ClientCnxn.java:1395)
    at org.apache.zookeeper.ClientCnxn.disconnect(ClientCnxn.java:1440)
    at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1467)
    at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:1319)

Issue Links

• is duplicated by: ZOOKEEPER-4296 NullPointerException when ClientCnxnSocketNetty is closed without being opened