Many thanks for the prompt reply Martin.
According to this: (EAP) 7 Supported Configurations EAP 7.1 is supported on Java 1.8.
Is there an EAP release earmarked ( name and release date ) for Java 1.9 support?
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Well, JDK9 is a specific topic that everyone likes to talk about and "want" it but don't really know the full impact of it.
But long story short, WildFly 11 mostly works on JDK9, there is an known issue with JPA / hibernate, which you can mitigate by manually upgrading javassit to latest version, which we couldn't upgrade in 11.0.0.Final as there was no GA version of it.
Keep in mind that WildFly 11 runnability on JDK9 is in classpath mode, not in jigsaw modular environment.
for some more details see WildFly Development - WildFly 11 and JDK9 | Threaded View
We do continue work on improving JDK9 support. So each next release will be better with JDK9 / 10.