See reproducer, XNIO threads increase until about 2000 in EAP.  A single XNIO thread is created in a similar spring-boot application, and it's unclear if the number of XNIO threads can be configured for the undertow component in this case.

The reproducer invokes an external REST service in a <toD> endpoint; the external REST service can be any valid endpoint (or could be hosted on the same container).  Compile/run with `mvn clean install wildfly:deploy`.

Observe the thread usage for the application, XNIO threads are created until about ~2000 total threads are created.

Environment: EAP 7.2.0 + Fuse 7.7