I know that there were a couple of discussion threads in 2010 around this, but Oracle's position around this seems to have been evolving, so I wanted to post it for current status.
If I run the apex listener with Tomcat, will I be able to log a support case with Oracle, and expect support, if the issue is suspected to be with Apex and not Tomcat (knowing that Oracle cannot be realistically expected to support Tomcat) or the listener with tomcat configuration?