[Originally reported as issue #34022, tracking
XTest's failure to handle this failure message
correctly. But the failure is also incorrect so
tracking it separately.]

Reports:

Some instances cannot be created [
    File
Templates/API_Support/API_test_script.java thrown
exception java.lang.ClassNotFoundException:
Templates.API_Support.API_test_script, 
    File
Templates/API_Support/Editor_API/EditorSupport.java
thrown exception java.lang.ClassNotFoundException:
Templates.API_Support.Editor_API.EditorSupport, 
    File
Templates/API_Support/Modules_API/Installer.java
thrown exception java.lang.ClassNotFoundException:
Templates.API_Support.Modules_API.Installer, 
    File
Templates/API_Support/Services_API/XMLProcessor.java
thrown exception java.lang.ClassNotFoundException:
Templates.API_Support.Services_API.XMLProcessor]

Of course these instances cannot be created - no
one is supposed to try. (Actually I am not sure
why the many other *.java files in apisupport's
templates *didn't* fail.) In skipFile I see:

if (s.startsWith ("Templates/GUIForms")) return true;

etc., just skipping every .java file in Templates.
Why not just skip all of Templates to begin with?
Or if you want to check e.g.
Templates/Services/**/*.settings, at least
condense these checks to

if (s.endsWith(".shadow")) return true;
if (s.endsWith(".java")) return true;

Note also that I think for 4.0 we should stop
using InstanceCookie on "user" data objects like
*.java, and deprecate IC.Of. See thread "Customize
Bean action - do we need it?" on nbui, and also
issue #32749 and issue #31960. If we restricted
this cookie to actual settings, the layer
validation test would be simplified.