When you add a runtime to a runtime-less server, you cannot remove it again

1. Create a local server with a runtime (e.g. EAP 6.2) 2. Create a remote server without a runtime, same type as above, e.g. EAP 6.2 3. Open the remote server in server editor (i.e. double-click the server in Server View) 4. Close to the top, there is the runtimes drop down menu, click it 5. Now you can only select the only runtime that you have. Once you do that and save the editor, there is no way to revert back to a runtime-less server.