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recent pull of main and contrib preiew2 build 08 I see an error that says: "" is not a valid path for a folder on the Frameworks page of the New Web App wizard.... if I select JSF
this looks like another class path issue... I don't think the jsf libs are in the server classpath... (see line web.jsf/.../JSFConfigurationPanelvisual.java [about line 586])
i think this is caused because you don't have visualweb module in your netbeans. When you have visualweb2 module in netbeans you can see jsf libs in tools->libraries. So its not classpath issue of gf3...you will have the same problem with gfv2 app server. But maybe warning "" is not a valid path for a folder could be better explaining.
cannot reproduce with a recently pulled source build... closing