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https://issues.apache.org/jira/browse/HADOOP-19574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18017950#comment-18017950
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ASF GitHub Bot commented on HADOOP-19574:
-----------------------------------------
szetszwo commented on PR #7892:
URL: https://github.com/apache/hadoop/pull/7892#issuecomment-3250102379
@stoty , thanks for trying it out! The code should look like below:
```java
public class SubjectDoAsThread extends Thread {
private final Runnable runnable;
private Subject startSubject;
public static class Builder {
private ThreadGroup group;
private String name;
private Runnable runnable;
public Builder setThread(Thread thread) {
this.group = thread.getThreadGroup();
this.name = thread.getName();
this.runnable = thread;
return this;
}
public SubjectDoAsThread build() {
return new SubjectDoAsThread(group, name, runnable);
}
}
private SubjectDoAsThread(ThreadGroup group, String name, Runnable
runnable) {
super(group, name);
this.runnable = Objects.requireNonNull(runnable, "runnable == null");
}
@Override
public final void start() {
startSubject = SubjectUtil.current();
super.start();
}
@Override
public final void run() {
SubjectUtil.doAs(startSubject, (PrivilegedAction<Void>) () -> {
runnable.run();
return null;
});
}
}
```
> Restore Subject propagation semantics for Java 22+
> --------------------------------------------------
>
> Key: HADOOP-19574
> URL: https://issues.apache.org/jira/browse/HADOOP-19574
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Istvan Toth
> Assignee: Istvan Toth
> Priority: Critical
> Labels: pull-request-available
>
> Java 22 breaks Subject propagation for new Threads (when SecurityManager is
> not enabled).
> Previously, the Subject set by Subject.doAs() / Subject.callAs()
> automatically propagated to any new Threads created (via new Thread(), not
> Executors).
> With JDK22, this is no longer the case, new Threads do NOT inherit the
> Subject.
> As Hadoop heavily relies on the original behavior, we somehow need to solve
> this problem.
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