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I've just built the most recent dev build: NetBeans IDE Dev (Build 20170330-9cc80de6bf9a) and started it with empty directory. Opened netbeans/templatesui project and after scanning the HTMLJavaTemplateTest file is shown as errorneus. However when you open it in editor everything is green - there is no error at all.
The node tooltip says: Error parsing file, but there is no other info; not even in the log.