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If you create a web app that targets v3, you see the following message (in red) at the bottom of the editor for index.jsp... Servlet API classes are not on the classpath, some scriptlet editing features are disabled. if you create a servlet from the template, many lines of the file are marked with red squigglies...
Created attachment 59719 [details] this appeared to fix it.
Regarding our conversation in my office on Friday Apr 4, this might be a packaging problem (e.g. javax.javaee-10.0-SNAPSHOT.jar may not be a valid name for the jar). However it turns out that I've already fixed this in my local repository, slightly differently than your patch, but close enough. Thanks for the bug.
This was fixed on Mar 31 in this patch: http://hg.netbeans.org/main/contrib/rev/88adeb86ebd4 Update your source tree...