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https://issues.apache.org/jira/browse/KAFKA-7324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajini Sivaram resolved KAFKA-7324.
-----------------------------------
Resolution: Fixed
> NPE due to lack of SASLExtensions in SASL/OAUTHBEARER
> -----------------------------------------------------
>
> Key: KAFKA-7324
> URL: https://issues.apache.org/jira/browse/KAFKA-7324
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 2.1.0
> Reporter: Ron Dagostino
> Assignee: Ron Dagostino
> Priority: Major
> Fix For: 2.1.0
>
>
> When there are no SASL extensions in an OAUTHBEARER request (or the callback
> handler does not support SaslExtensionsCallback) the
> OAuthBearerSaslClient.retrieveCustomExtensions() method returns null. This
> null value is then passed to the OAuthBearerClientInitialResponse
> constructor, and that results in an NPE:
> java.lang.NullPointerException
> at
> org.apache.kafka.common.security.oauthbearer.internals.OAuthBearerClientInitialResponse.validateExtensions(OAuthBearerClientInitialResponse.java:115)
> at
> org.apache.kafka.common.security.oauthbearer.internals.OAuthBearerClientInitialResponse.<init>(OAuthBearerClientInitialResponse.java:81)
> at
> org.apache.kafka.common.security.oauthbearer.internals.OAuthBearerClientInitialResponse.<init>(OAuthBearerClientInitialResponse.java:75)
> at
> org.apache.kafka.common.security.oauthbearer.internals.OAuthBearerSaslClient.evaluateChallenge(OAuthBearerSaslClient.java:99)
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