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https://issues.apache.org/jira/browse/KAFKA-8591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-8591.
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Resolution: Fixed
Fix Version/s: 2.3.1
2.2.2
> NPE when reloading connector configuration using WorkerConfigTransformer
> ------------------------------------------------------------------------
>
> Key: KAFKA-8591
> URL: https://issues.apache.org/jira/browse/KAFKA-8591
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 2.2.1
> Reporter: Nacho Munoz
> Assignee: Robert Yokota
> Priority: Major
> Fix For: 2.2.2, 2.3.1
>
>
> When a connector uses a ConfigProvider and sets a given TTL in the returned
> ConfigData, it is expected that WorkerConfigTransformer will periodically
> reload the connector configuration. The problem is that when the TTL expires
> a NPE is raised.
> [2019-06-17 14:34:12,320] INFO Scheduling a restart of connector
> workshop-incremental in 60000 ms
> (org.apache.kafka.connect.runtime.WorkerConfigTransformer:88)
> [2019-06-17 14:34:12,321] ERROR Uncaught exception in herder work thread,
> exiting: (org.apache.kafka.connect.runtime.distributed.DistributedHerder:227)
> java.lang.NullPointerException
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$19.onCompletion(DistributedHerder.java:1187)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$19.onCompletion(DistributedHerder.java:1183)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.tick(DistributedHerder.java:273)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.run(DistributedHerder.java:219)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at java.base/java.lang.Thread.run(Thread.java:834)
> The reason is that WorkerConfigTransformer is passing a null callback to the
> herder's restartConnector method.
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