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From "maoling (Jira)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-3579) handle NPE gracefully when the watch parameter of zookeeper java client is null
Date Mon, 14 Oct 2019 10:48:00 GMT
maoling created ZOOKEEPER-3579:
----------------------------------

             Summary: 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


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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