[Bug 272855] Mk/bsd.default-versions.mk: update JAVA_DEFAULT to 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272855

--- Comment #27 from Mikhail Teterin <mi@FreeBSD.org> ---
(In reply to Michael Osipov from comment #26)
> In C/C++ symbol versioning likely solves the problem

I think, you misunderstood, what I was talking about. The version of the
library, against which a program was LINKED would still matter to the software,
that has just been built. But the port doesn't care -- if you have libjpeg.so.5
already installed on your system, all of JPEG-using software can be linked with
that even if graphics/libjpeg is currently installing libjpeg.so.6.

The APIs don't change that often. Loosening up the LIB_DEPENDS by default was a
good thing -- and I'm proud to have been part of it :)

> soft-deprecated version ranges

That's quite wrong... Especially for the reasons listed: "people weren't using
them correctly". A system with five Java applications, all using log4j, ends up
with five different log4j-versions -- because none of the five
application-maintainers can be bothered to just depend on ONE version,
whichever it is. But they aren't satisfied with just telling you: "you need to
provide log4j", because then some clueless reviewer somewhere will say: "it is
not ready out of the box".

And then many insist on creating a giant monolithic JAR (which Maven makes too
easy), with all of the different dependencies inside it, so a sysadmin has to
really stick his head out to split it apart and replace pieces -- because now
he has "an unsupported configuration". (Been there, done that.)

Had this line of thinking prevailed earlier, we'd never have had shared
libraries either :(

Sorry, I digress.

> I think we need sane tradeoff w/o reinventing the wheel.

The inherent conflict is UNSOLVABLE: application-authors/maintainers care about
their one application working on all platforms. Platform people -- like FreeBSD
ports-maintainers -- care about all applications working on our one platform.

There is no solution, that both sides would like. Myself a platform person, I
think, we ought to CONTINUE the 30+ years tradition of making the apps build on
FreeBSD -- and do it the FreeBSD way...

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