Jastow is a JSP Engine for Java and is part of Undertow project.
Project Lead: Flavia Rainone firstname.lastname@example.org
Undertow Dev Group: https://groups.google.com/g/undertow-dev/ (you can access archived discussions of old undertow-dev mail list here)
Zulip Chat: https://wildfly.zulipchat.com stream #undertow
Notifying Security Relevant Bugs
If you find a bug that has a security impact, please notify us sending an email to Red Hat SecAlert email@example.com with a copy to Flavia Rainone firstname.lastname@example.org. This will ensure the bug is properly handled without causing unnecessary negative impacts for the Undertow's user base.
You can find more information about the security procedures at this page.