>firstly i recommend to use Fedora toolbox [0] for this kind of things on
Silverblue (it's part of Silverblue already).

Not everything can easily be done in a containerized environment. The game
"Minecraft" for example needs a system JRE in order to run as it is written
in Java and is installed via a jar file(old launcher anyway). While not
ideal, I don't think this is against the Fedora Silverblue containerized
idea. That is to say, Java is a semi dynamic extension of the base system
and NOT an application.

Yes, it is possible to bundle a Java program with a JRE/JDK in a Flatpak
and distribute that. The problem is that it both takes up significant disk
space compared to if you were to just use the system JDK and makes it
difficult to switch between JRE/JDK versions if need be.


>Secondly, isn't this what modules are meant for? I'm not sure if there is
one for JDK on Fedora.

Java 9 modules you mean? Java 9 modules are a way to create a JDK bundle
with your app with significantly less fat as only what is needed is
included. For distribution of a program written in Java, sure that works as
long as the program is modeler... but not all are.

That's the thing: I need to switch between a "server" build of the JDK(uses
MORE memory, what every distro ships) and a "client" build(uses less
memory, needs to be compiled from source) as well as any other custom
builds I might compile or install from time to time. I'd imagine this could
be done via the build script but that just complicates things and is
specific to the computer the software is being compiled on. It's easier to
just quit the IDE(netbeans in my case), switch versions, and start it up
again.

The only problem is that the current running JRE/JDK is being (potentially)
pulled from under any running Java application that is utilizing the system
JRE/JDK and a newer or older version is replacing it. This, however, is a
problem in Flatpak applications as well and there doesn't seem to be any
solution other than to somehow completely load the application and all of
it's library dependencies(Java, Nvidia libs, etc) in memory. Java is not
system critical just as the Flatpak runtimes are not system critical.
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