I am repeatedly seeing NPEs for calls made to ZkClient. I am using zkClient-0.5 + zookeeper 3.4.5 + kafka 0.8.2.0
There is a related jira for similar NPE issue, and looks like zkClient-0.5 must have solved the issue. https://issues.apache.org/jira/browse/KAFKA-2169 https://issues.apache.org/jira/browse/KAFKA-824 Some of the stack traces of calls I made : java.lang.NullPointerException: null at org.I0Itec.zkclient.ZkConnection.exists(ZkConnection.java:107) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:631) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:628) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:883) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:628) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:637) ~[zkclient-0.5.jar:0.5] at kafka.admin.AdminUtils$.topicExists(AdminUtils.scala:163) ~[kafka_2.10-0.8.2.0.jar:na] at kafka.admin.AdminUtils.topicExists(AdminUtils.scala) ~[kafka_2.10-0.8.2.0.jar:na] java.lang.NullPointerException: null at org.I0Itec.zkclient.ZkConnection.getChildren(ZkConnection.java:112) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:608) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:605) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:883) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:605) ~[zkclient-0.5.jar:0.5] at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:601) ~[zkclient-0.5.jar:0.5] at kafka.utils.ZkUtils$.getChildrenParentMayNotExist(ZkUtils.scala:475) ~[kafka_2.10-0.8.2.0.jar:na] at kafka.utils.ZkUtils$.getAllTopics(ZkUtils.scala:700) ~[kafka_2.10-0.8.2.0.jar:na] at kafka.utils.ZkUtils.getAllTopics(ZkUtils.scala) ~[kafka_2.10-0.8.2.0.jar:na] Is there a solution for this? Thanks, Hema "This message is intended only for the use of the addressee(s) and may contain information that is PRIVILEGED and CONFIDENTIAL. If you are not the intended recipient(s), you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify the sender immediately."
