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https://issues.apache.org/jira/browse/ZOOKEEPER-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zili Chen reassigned ZOOKEEPER-3579:
------------------------------------
Assignee: Zili Chen
> handle NPE gracefully when the watch parameter of zookeeper java client is
> null
> -------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3579
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3579
> Project: ZooKeeper
> Issue Type: Bug
> Components: java client
> Reporter: maoling
> Assignee: Zili Chen
> Priority: Minor
>
> When we use the native java client
> {code:java}
> try {
> zk = new ZooKeeper(connectString, (int) sessionTimeout, null);
> } catch (IOException e) {
> throw new DBException("Creating connection failed.");
> }
> {code}
> We will get the following, this issue had existed in all the zookeeper
> releases for a long time
> {code:java}
> 2019-10-14 18:41:49 ERROR ClientCnxn:537 - Error while calling
> watcher2019-10-14 18:41:49 ERROR ClientCnxn:537 - Error while calling
> watcherjava.lang.NullPointerException at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)2019-10-14
> 18:41:50 ERROR ClientCnxn:537 - Error while calling
> watcherjava.lang.NullPointerException at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
> {code}
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