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https://issues.apache.org/jira/browse/KAFKA-7631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17788786#comment-17788786
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Andrew Olson commented on KAFKA-7631:
-------------------------------------
This looks like a duplicate of KAFKA-10556 (fixed in 2.7.0).
> NullPointerException when SCRAM is allowed bu ScramLoginModule is not in
> broker's jaas.conf
> -------------------------------------------------------------------------------------------
>
> Key: KAFKA-7631
> URL: https://issues.apache.org/jira/browse/KAFKA-7631
> Project: Kafka
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.0.0, 2.5.0
> Reporter: Andras Beni
> Priority: Minor
> Attachments: KAFKA-7631.patch
>
>
> When user wants to use delegation tokens and lists {{SCRAM}} in
> {{sasl.enabled.mechanisms}}, but does not add {{ScramLoginModule}} to
> broker's JAAS configuration, a null pointer exception is thrown on broker
> side and the connection is closed.
> Meaningful error message should be logged and sent back to the client.
> {code}
> java.lang.NullPointerException
> at
> org.apache.kafka.common.security.authenticator.SaslServerAuthenticator.handleSaslToken(SaslServerAuthenticator.java:376)
> at
> org.apache.kafka.common.security.authenticator.SaslServerAuthenticator.authenticate(SaslServerAuthenticator.java:262)
> at
> org.apache.kafka.common.network.KafkaChannel.prepare(KafkaChannel.java:127)
> at
> org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:489)
> at org.apache.kafka.common.network.Selector.poll(Selector.java:427)
> at kafka.network.Processor.poll(SocketServer.scala:679)
> at kafka.network.Processor.run(SocketServer.scala:584)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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