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https://issues.apache.org/jira/browse/HADOOP-15294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398006#comment-16398006
 ] 

Akira Ajisaka commented on HADOOP-15294:
----------------------------------------

LGTM, +1

> TestUGILoginFromKeytab fails on Java9
> -------------------------------------
>
>                 Key: HADOOP-15294
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15294
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: security
>         Environment: Applied HADOOP-12760 and HDFS-11610
>            Reporter: Takanobu Asanuma
>            Assignee: Takanobu Asanuma
>            Priority: Major
>         Attachments: HADOOP-15294.1.patch
>
>
> This is the same cause as HADOOP-15291, but this time we may need to fix 
> {{UserGroupInformation}}.
> {noformat}
> [ERROR] 
> testReloginAfterFailedRelogin(org.apache.hadoop.security.TestUGILoginFromKeytab)
>   Time elapsed: 1.157 s  <<< ERROR!
> org.apache.hadoop.security.KerberosAuthException:
> Login failure for user: us...@example.com 
> javax.security.auth.login.LoginException: java.lang.NullPointerException: 
> invalid null input(s)
>       at java.base/java.util.Objects.requireNonNull(Objects.java:246)
>       at 
> java.base/javax.security.auth.Subject$SecureSet.remove(Subject.java:1172)
>         ...
>       at 
> org.apache.hadoop.security.UserGroupInformation$HadoopLoginContext.logout(UserGroupInformation.java:1888)
>       at 
> org.apache.hadoop.security.UserGroupInformation.unprotectedRelogin(UserGroupInformation.java:1129)
>       at 
> org.apache.hadoop.security.UserGroupInformation.relogin(UserGroupInformation.java:1109)
>       at 
> org.apache.hadoop.security.UserGroupInformation.reloginFromKeytab(UserGroupInformation.java:1078)
>       at 
> org.apache.hadoop.security.UserGroupInformation.reloginFromKeytab(UserGroupInformation.java:1060)
>       at 
> org.apache.hadoop.security.TestUGILoginFromKeytab.testReloginAfterFailedRelogin(TestUGILoginFromKeytab.java:363)
> {noformat}



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