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https://issues.apache.org/jira/browse/KAFKA-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057007#comment-15057007
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ASF GitHub Bot commented on KAFKA-2990:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/675
> NoSuchMethodError when Kafka is compiled with 1.8 and run on 1.7
> ----------------------------------------------------------------
>
> Key: KAFKA-2990
> URL: https://issues.apache.org/jira/browse/KAFKA-2990
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
>
> I saw the following exception in the server logs when Kafka is compiled with
> 1.8 jdk and run on a 1.7.
> {code}
> java.lang.NoSuchMethodError:
> java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
> at kafka.utils.Pool.keys(Pool.scala:79)
> at
> kafka.coordinator.GroupMetadataManager.kafka$coordinator$GroupMetadataManager$$removeGroupsAndOffsets$1(GroupMetadataManager.scala:483)
> at
> kafka.coordinator.GroupMetadataManager$$anonfun$removeGroupsForPartition$1.apply$mcV$sp(GroupMetadataManager.scala:465)
> at
> kafka.utils.KafkaScheduler$$anonfun$1.apply$mcV$sp(KafkaScheduler.scala:110)
> at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:60)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> The keySet() method for ConcurrentHashMap was changed in 1.8 to refer to
> KeySetView, which didn't exist in 1.7. To fix it, we just need to make sure
> that Pool calls ConcurrentMap.keySet() instead.
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