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https://issues.apache.org/jira/browse/CASSANDRA-17347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17487012#comment-17487012
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Stefan Miklosovic commented on CASSANDRA-17347:
-----------------------------------------------
https://ci-cassandra.apache.org/job/Cassandra-devbranch/1402/
> Instance failed to start up due to NPE in StartupClusterConnectivityChecker
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-17347
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17347
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Logging
> Reporter: Francisco Guerrero
> Assignee: Francisco Guerrero
> Priority: Normal
> Fix For: 4.x
>
>
> Instance is crashing during startup due to a NPE in
> StartupClusterConnectivityChecker with stack trace:
> {noformat}
> java.lang.NullPointerException: element cannot be mapped to a null key
> at java.util.Objects.requireNonNull(Objects.java:228)
> at
> java.util.stream.Collectors.lambda$groupingBy$45(Collectors.java:907)
> at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
> at
> java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
> at
> java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at
> java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
> at
> org.apache.cassandra.net.StartupClusterConnectivityChecker.execute(StartupClusterConnectivityChecker.java:173)
> {noformat}
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