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bug#42423: icedtea: JAVA_HOME

From: Christopher Howard
Subject: bug#42423: icedtea: JAVA_HOME
Date: Fri, 31 Jul 2020 06:14:48 -0800

Hi, I am open to learning more and to guix developer wisdom. I don't
quite understand your argument, though — I wouldn't think this would be
any more difficult a question than deciding what version of the java
binary would show up in your profile: you would only select one version
in a profile. If you need to work with multiple versions (not talking
about dependencies) you would create multiple profiles, or multiple
manifest files to use with guix environment.

I would assume if we are talking about guix package dependencies, you
are relying on the direct paths. But practical case here is if you just
download some Java code and run "ant build" or "ant run": that won't
work unless "JAVA_HOME" is defined, which is a bother to figure out
yourself every time you want to update your profile. This is what I
have to do to get arduino-ide running (as well as running patchelf on
the generated binaries, but that is another story...)

Christopher Howard
p: +1 (907) 374-0257
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On Fri, 2020-07-31 at 13:49 +0200, Michael Rohleder wrote:
> Hi Christopher,
> Christopher Howard <christopher.howard@qlfiles.net> writes:
> > Hi, I'm not going to pretend to be a Java expert, but I was trying
> > to
> > build and run a Java application, and had to set JAVA_HOME
> > manually. It
> > is my understanding from my research[1] that applications often
> > will
> > want JAVA_HOME set to the path to the java install directory. It
> > would
> > seem like it would be useful if Guix set that as well for the
> > icedtea
> > and icedtea:jdk package.
> > 
> > If there are good reasons for that not to be, perhaps more
> > knowledgeable individuals will explain it.
> > 
> > One part I'm not quite sure about is what JAVA_HOME would be set to
> > if
> > both icedtea and icedtea:jdk were installed.
> I dont think this is a good idea (or even possible?):
> From a Developer POV I think its pretty common to have many jdk's
> installed
> (8,11,14 sometimes even 7). To what should JAVA_HOME be set/defaults
> in this
> case?
> I dont know a distribution which sets JAVA_HOME (per default) and I
> think its much better to let the user or sysadmin decide which one is
> best...

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