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https://issues.apache.org/jira/browse/KNOX-3342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Work on KNOX-3342 started by Sandor Molnar.
-------------------------------------------
> HadoopGroupLookup throws NPE
> ----------------------------
>
> Key: KNOX-3342
> URL: https://issues.apache.org/jira/browse/KNOX-3342
> Project: Apache Knox
> Issue Type: Improvement
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Critical
>
> In certain cases, when {{hadoopGroups}} cannot be initialized, the following
> NPE is thrown in {{{}HadoopGroupFilter{}}}:
>
> {noformat}
> 2026-06-09 14:59:27,432 c3249626-0586-4ab0-9185-f3c778c6cea5 WARN
> federation.remote (RemoteAuthFilter.java:doFilter(275)) - Error received
> during authentication process: java.lang.NullPointerException.)
> java.lang.NullPointerException: null
> at
> org.apache.hadoop.thirdparty.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:903)
> ~[hadoop-shaded-guava-1.4.0.jar:1.4.0]
> at
> org.apache.hadoop.thirdparty.com.google.common.cache.LocalCache.get(LocalCache.java:4010)
> ~[hadoop-shaded-guava-1.4.0.jar:1.4.0]
> at
> org.apache.hadoop.thirdparty.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4034)
> ~[hadoop-shaded-guava-1.4.0.jar:1.4.0]
> at
> org.apache.hadoop.thirdparty.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:5010)
> ~[hadoop-shaded-guava-1.4.0.jar:1.4.0]
> at org.apache.hadoop.security.Groups.getGroupInternal(Groups.java:260)
> ~[hadoop-common-3.4.2.7.3.2.0-957.jar:?]
> at org.apache.hadoop.security.Groups.getGroups(Groups.java:216)
> ~[hadoop-common-3.4.2.7.3.2.0-957.jar:?]
> at
> org.apache.knox.gateway.identityasserter.hadoop.groups.filter.HadoopGroupProviderFilter.hadoopGroups(HadoopGroupProviderFilter.java:117)
>
> ~[gateway-provider-identity-assertion-hadoop-groups-2.0.0.2.0.0-b1016.jar:2.0.0.2.0.0-b1016]
> at
> org.apache.knox.gateway.identityasserter.hadoop.groups.filter.HadoopGroupProviderFilter.mapGroupPrincipals(HadoopGroupProviderFilter.java:99)
>
> ~[gateway-provider-identity-assertion-hadoop-groups-2.0.0.2.0.0-b1016.jar:2.0.0.2.0.0-b1016]
> {noformat}
>
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