I just wanted to test the EAP 7.1 adapter in devstudio 11 (devstudio-11.0.0.AM1-v20170529-1745-B180-installer-standalone.jar) and I got surprised by this error when I opened the server editor and then tried to save it:
The server cannot be saved for the following reasons:
[Overview] Your server must have a valid shutdown poller selected.
In fact both startup and shutdown pollers are empty, not sure why.