[ZOOKEEPER-3579] handle NPE gracefully when the watch parameter of zookeeper java client is null - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 3.7.0
Component/s: java client
Labels:
- pull-request-available

Description

When we use the native java client

try {
  zk = new ZooKeeper(connectString, (int) sessionTimeout, null);
} catch (IOException e) {
  throw new DBException("Creating connection failed.");
}

We will get the following, this issue had existed in all the zookeeper releases for a long time

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)