Istvan Toth created HADOOP-19744:
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Summary: Improve SubjectUtil.checkThreadInheritsSubject
Key: HADOOP-19744
URL: https://issues.apache.org/jira/browse/HADOOP-19744
Project: Hadoop Common
Issue Type: Bug
Reporter: Istvan Toth
While the code, it causes Hadoop to emit warnings
{noformat}
WARNING: A terminally deprecated method in java.lang.System has been called
WARNING: System::setSecurityManager has been called by
org.apache.hadoop.security.authentication.util.SubjectUtil
(file:/Users/stevel/.m2/repository/org/apache/hadoop/hadoop-auth/3.5.0-SNAPSHOT/hadoop-auth-3.5.0-SNAPSHOT.jar)
WARNING: Please consider reporting this to the maintainers of
org.apache.hadoop.security.authentication.util.SubjectUtil
{noformat}
The SecurityManager check is only really needed for Java 22-23.
We shortcut the check by returning true for JDK21 and earlier and false for
JDK24 and later, and only check and emit warnings for 22-23, which are EOL
anyway.
We can also try to duplicate the logic the JVM uses to determine whether
SecurityManager is enabled without explicitly calling it, but that would be
less robust than the current check.
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