Maksym,
We never had direct support for JBoss EAP in MyEclipse. The JBoss connector validation was made more strict in CI 15 so now it validates only against JBoss AS and not JBoss EAP.
You can work around the validation issue by creating a dummy jar file with name jboss-as-web-7.1.1.Final.jar in this path : {$jboss.home}/modules/org/jboss/as/web/main. If the folder structure is not present in the JBoss EAP installation, please create the folders accordingly. The JBoss AS 7.x connector will now support JBoss EAP 6.x.
I have filed a report with the dev team about JBoss EAP support and they are looking into it.
Let us know how it works for you.
–Swapna
MyEclipse Support