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See the issue #176596 for more details. If one create a CC w/o int. and impl. sections the file is not indexed as CC and hence the completion doesn't offer the tag and if used in the editor, it is marked as erroneous.
Hmm, the file refers to the real composite component as template client :-( I am not able to properly fix this in the given timeframe whatsoever. What I can do *now to 6.8* is a hack which would disable the error check if a composite component has zero attributes. The completion won't work then of course for the component.
the proposed workaround implemented in web-main#85623ecd32bc to prevent the biggest harms. However I do not consider the issue as fixed, so keeping opened.
Integrated into 'main-golden', will be available in build *200911160201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/85623ecd32bc User: Marek Fukala <mfukala@netbeans.org> Log: #176807 - Composite component w/o interface and implementation is ignored
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss