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https://issues.apache.org/jira/browse/KAFKA-17268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-17268.
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Fix Version/s: 4.0.0
Resolution: Fixed
> Fix NPE when closing a non-started acceptor
> -------------------------------------------
>
> Key: KAFKA-17268
> URL: https://issues.apache.org/jira/browse/KAFKA-17268
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Assignee: kangning.li
> Priority: Minor
> Fix For: 4.0.0
>
>
> {code:java}
> java.lang.NullPointerException
> at kafka.network.Acceptor.$anonfun$closeAll$2(SocketServer.scala:711)
> at kafka.utils.CoreUtils$.swallow(CoreUtils.scala:68)
> at kafka.network.Acceptor.closeAll(SocketServer.scala:711)
> at kafka.network.Acceptor.close(SocketServer.scala:678)
> at
> kafka.network.SocketServer.$anonfun$stopProcessingRequests$4(SocketServer.scala:287)
> at
> kafka.network.SocketServer.$anonfun$stopProcessingRequests$4$adapted(SocketServer.scala:287)
> at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:619)
> at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:617)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:935)
> at
> kafka.network.SocketServer.stopProcessingRequests(SocketServer.scala:287)
> at kafka.server.BrokerServer.$anonfun$shutdown$5(BrokerServer.scala:642)
> at kafka.utils.CoreUtils$.swallow(CoreUtils.scala:68)
> at kafka.server.BrokerServer.shutdown(BrokerServer.scala:642)
> at kafka.server.KafkaBroker.shutdown(KafkaBroker.scala:98)
> at kafka.server.KafkaBroker.shutdown$(KafkaBroker.scala:98)
> at kafka.server.BrokerServer.shutdown(BrokerServer.scala:68)
> at kafka.server.BrokerServer.startup(BrokerServer.scala:559)
> at
> kafka.server.KafkaRaftServer.$anonfun$startup$2(KafkaRaftServer.scala:99)
> at
> kafka.server.KafkaRaftServer.$anonfun$startup$2$adapted(KafkaRaftServer.scala:99)
> at scala.Option.foreach(Option.scala:437)
> at kafka.server.KafkaRaftServer.startup(KafkaRaftServer.scala:99)
> at kafka.Kafka$.main(Kafka.scala:112)
> at kafka.Kafka.main(Kafka.scala)
> {code}
> The `serverChannel` will be null if `Acceptor`'s thread is not started.
> Hence, closing a non-started will produce NPE [0]
> [0]
> https://github.com/apache/kafka/blob/736bd3cd093cd418b4fec5b583359884f23265ff/core/src/main/scala/kafka/network/SocketServer.scala#L677
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