From Eclipse OpenJ9 0.15 to 0.16, access to diagnostic operations such as causing a GC or creating a diagnostic file are permitted without any privilege checks.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=552129
https://access.redhat.com/errata/RHSA-2020:0046
https://access.redhat.com/errata/RHSA-2020:0006