Jerry He created ZOOKEEPER-1875:
-----------------------------------
Summary: NullPointerException in
ClientCnxn$EventThread.processEvent
Key: ZOOKEEPER-1875
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1875
Project: ZooKeeper
Issue Type: Bug
Components: java client
Affects Versions: 3.4.5
Reporter: Jerry He
Priority: Minor
Fix For: 3.5.0
We've been seeing NullPointerException while working on HBase:
{code}
14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Client
environment:user.dir=/home/biadmin/hbase-trunk
14/01/30 22:15:25 INFO zookeeper.ZooKeeper: Initiating client connection,
connectString=hdtest009:2181 sessionTimeout=90000 watcher=null
14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Opening socket connection to
server hdtest009/9.30.194.18:2181. Will not attempt to authenticate using SASL
(Unable to locate a login configuration)
14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Socket connection established to
hdtest009/9.30.194.18:2181, initiating session
14/01/30 22:15:25 INFO zookeeper.ClientCnxn: Session establishment complete on
server hdtest009/9.30.194.18:2181, sessionid = 0x143986213e67e48, negotiated
timeout = 60000
14/01/30 22:15:25 ERROR zookeeper.ClientCnxn: Error while calling watcher
java.lang.NullPointerException
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
{code}
The reason is the watcher is null in this part of the code:
{code}
private void processEvent(Object event) {
try {
if (event instanceof WatcherSetEventPair) {
// each watcher will process the event
WatcherSetEventPair pair = (WatcherSetEventPair) event;
for (Watcher watcher : pair.watchers) {
try {
watcher.process(pair.event);
} catch (Throwable t) {
LOG.error("Error while calling watcher ", t);
}
}
{code}
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