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https://issues.apache.org/jira/browse/KAFKA-8591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16871111#comment-16871111
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Nacho Munoz commented on KAFKA-8591:
------------------------------------
A PR has been opened to address this issue -
[https://github.com/apache/kafka/pull/6991]
> 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
> Priority: Major
>
> When a connector uses a ConfigProvider and sets a given TTL in the returned
> ConfigData, it is expected that WorkerConfigTransformer will 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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