Re: Can I run Alfresco community 201707 GA on a more current Tomcat like 8.0/8.5/9? The release notes only speak of Tomcat 7. Thank you!
You can certainly run Alfresco on Tomcat 8.5, which is the default now for the newer versions of Alfresco. Some of the Tomcat-specific configuration to enable extensibility via the <root>/modules/platform and <root>/modules/share folders (for Alfresco Simple JAR modules) work differently in Tomcat 8.5 compared to 8, so you might have to mix + match some of the documentation / examples, but otherwise it should work without a hitch.
Don't know the differences in Tomcat 9 too well to make an educated guess, and have not seen / heard of anyone using this with Alfresco yet.