WebSphere introduced the "Liberty Profile" - a "lightweight" container that loads components on-demand.
It's freely available, JVM agnostic, and targetted at developers for fast load/unload/[re]deployment.
Although it's marketted with WAS 8.5, it's completely different under-the-hood - the startup mechanism and half of the agent's existing instrumentation dependencies are no longer relevant.
JEE-8537 has been logged to add support fo Websphere Liberty Pofile 8.5 and 8.5.5
STATUS:Waiting fo a fix in a future release