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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: [External] : Re: command mode-specificity [was: scratch/command
 064f146 1/2: Change...]
Date: Thu, 18 Feb 2021 22:24:26 +0200
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To: Alan Mackenzie <acm@muc.de>
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> Date: Thu, 18 Feb 2021 20:14:18 +0000
> From: Alan Mackenzie <acm@muc.de>
> Cc: emacs-devel@gnu.org
> 
> > AFAIR those modes derive from c-mode, right? It that is so, the
> > commands are automatically applicable to them.
> 
> Not in the sense of define-derived-mode, no.

Then you could put the 'completion-predicate' property on the symbols
of relevant CC mode commands, and write a predicate that would DTRT
with CC mode commands in modes like java-mode.