[arch-general] How to have multiple JDKs parallel?

[Eli Schwartz]

On 9/17/18 7:50 AM, Peter Nabbefeld wrote:
> Sorry, I accidently sent my earlier response to Olli privately. So one
> question has been lost:
> 
> Probably, pacman could be extended with an option to change the update
> strategy from replace to add?
> 
> This would make it a lot easier than building my own packages or even
> setup a dedicated VM, as I'm changing JDKs in my IDE on a per-project
> base. This just ensures I'm not using newer features for environments
> where I cannot use those. BTW, I'm feeling comfortable to use the latest
> JDK, but I just want to be able to try out solutions for older ones with
> possibly missing features (or just older class file version numbers).
> E.g. in some cases some environments cannot work with newer class file
> versions, one prominent piece being Maven, as far as I read on some
> mailing lists (some plugins seemed to reject work with projects using
> JDK 9, but as I still use JDK 8, currently, it's not been my problem).

This option already exists. pacman asks you if you want to replace the
one with the other. Just say "no".

The packages neither provide nor conflict each other, so there's
absolutely nothing wrong with doing so. Admittedly, it's no longer a
repo package so it's unsupported, but that was the case whether it was
moved to the AUR or deleted with a replaces.

...

You will get prompted again and again on every pacman -Su "to see if
you're finally ready to do the replacement".

-- 
Eli Schwartz
Bug Wrangler and Trusted User

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