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https://issues.apache.org/jira/browse/KAFKA-12730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajini Sivaram resolved KAFKA-12730.
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Reviewer: Manikumar
Resolution: Fixed
> A single Kerberos login failure fails all future connections from Java 9
> onwards
> --------------------------------------------------------------------------------
>
> Key: KAFKA-12730
> URL: https://issues.apache.org/jira/browse/KAFKA-12730
> Project: Kafka
> Issue Type: Bug
> Components: security
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Major
> Fix For: 3.0.0
>
>
> The refresh thread for Kerberos performs re-login by logging out and then
> logging in again. If login fails, we retry after a backoff. Every iteration
> of the loop performs loginContext.logout() and loginContext.login(). If login
> fails, we end up with two consecutive logouts. This used to work, but from
> Java 9 onwards, this results in a NullPointerException due to
> https://bugs.openjdk.java.net/browse/JDK-8173069. We should check if logout
> is required before attempting logout.
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