Sandor Molnar created KNOX-3342:
-----------------------------------
Summary: 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
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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