A little context: in Infinspan Server CLI, we have a "shutdown" command to stop the server. It is pretty basic and it makes sure the main thread returns. However, I have 1 thread from Elytron thread pool preventing the process to stop. As a temporary (or not) workaround, I have added SecurityDomain.getScheduledExecutorService().shutdown(); at the end of our code.

Is it intentional the default ScheduledExecutorService created in [1] to spawn non-daemon threads?

Infinispan is currently using Elytron 1.15.5.Final

[1] https://github.com/wildfly-security/wildfly-elytron/blob/1.x/auth/server/base/src/main/java/org/wildfly/security/auth/server/SecurityDomain.java#L1252