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https://issues.apache.org/jira/browse/NIFI-5820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689614#comment-16689614
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ASF GitHub Bot commented on NIFI-5820:
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Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/3174
Thanks for taking a look at the PR, @joewitt. That warning is due to
accessing, via reflection, the `pid` method on the Process API, which was added
in Java 9. The code that does this was added by NIFI-5175, to allow NiFI built
on Java 1.8 to run on Java 9. There's a comment in the code detailing why the
use of reflection is necessary. Please see
https://github.com/apache/nifi/blob/master/nifi-bootstrap/src/main/java/org/apache/nifi/bootstrap/util/OSUtils.java#L111.
The warning is expected, and when we have a minimum requirement of Java 11,
we can refactor OSUtils, or probably remove the class entirely, since the
Process API (as of Java 9) provides a platform independent way to get a PID. I
don't think we'll need to have the methods in OSUtils for getting the PID based
on which platform on which NiFi is running.
> NiFi built with Java 1.8 needs to run on Java 11
> ------------------------------------------------
>
> Key: NIFI-5820
> URL: https://issues.apache.org/jira/browse/NIFI-5820
> Project: Apache NiFi
> Issue Type: Sub-task
> Reporter: Jeff Storck
> Assignee: Jeff Storck
> Priority: Major
>
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