Dear Josh:
Sorry for the late reply.
So I discussed with PM and here is the essence.
1) Applications :
If your application is non-modular and looking for only compatibility support i.e. apps running on JRE 7, 8 on JVM 11 that should work today. But full compatibility with Java 11 may take longer. This seems to be your focus.
2) APM EM ships with Java as Lutz mentioned. So in theory, you shouldn't be concerned about this.
Thanks
Hal German