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https://issues.apache.org/jira/browse/KAFKA-9219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Mickael Maison resolved KAFKA-9219.
-----------------------------------
Fix Version/s: 2.5.0
Resolution: Fixed
> NullPointerException when polling metrics from Kafka Connect
> ------------------------------------------------------------
>
> Key: KAFKA-9219
> URL: https://issues.apache.org/jira/browse/KAFKA-9219
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 2.4.0
> Reporter: Mickael Maison
> Priority: Major
> Fix For: 2.5.0
>
>
> The following stack trace appears:
>
> {code:java}
> [2019-11-05 23:56:57,909] WARN Error getting JMX attribute 'assigned-tasks'
> (org.apache.kafka.common.metrics.JmxReporter:202)
> java.lang.NullPointerException
> at
> org.apache.kafka.connect.runtime.distributed.WorkerCoordinator$WorkerCoordinatorMetrics$2.measure(WorkerCoordinator.java:316)
> at
> org.apache.kafka.common.metrics.KafkaMetric.metricValue(KafkaMetric.java:66)
> at
> org.apache.kafka.common.metrics.JmxReporter$KafkaMbean.getAttribute(JmxReporter.java:190)
> at
> org.apache.kafka.common.metrics.JmxReporter$KafkaMbean.getAttributes(JmxReporter.java:200)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttributes(DefaultMBeanServerInterceptor.java:709)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.getAttributes(JmxMBeanServer.java:705)
> at
> javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1449)
> at
> javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
> at
> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
> at
> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
> at
> javax.management.remote.rmi.RMIConnectionImpl.getAttributes(RMIConnectionImpl.java:675)
> at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
> at sun.rmi.transport.Transport$1.run(Transport.java:200)
> at sun.rmi.transport.Transport$1.run(Transport.java:197)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
> at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:835)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
> at java.security.AccessController.doPrivileged(Native Method)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> [2019-11-05 23:57:02,821] INFO [Worker clientId=connect-1,
> groupId=backup-mm2] Herder stopped
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:629)
> [2019-11-05 23:57:02,821] INFO [Worker clientId=connect-2, groupId=cv-mm2]
> Herder stopping
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:609)
> [2019-11-05 23:57:07,822] INFO [Worker clientId=connect-2, groupId=cv-mm2]
> Herder stopped
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:629)
> [2019-11-05 23:57:07,822] INFO Kafka MirrorMaker stopped.
> (org.apache.kafka.connect.mirror.MirrorMaker:191)
> {code}
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