[debbugs-tracker] bug#29700: closed (Java packages need to retain references)

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Your message dated Thu, 14 Dec 2017 23:59:22 +0100
with message-id <address@hidden>
and subject line Re: bug#29700: Java packages need to retain references
has caused the debbugs.gnu.org bug report #29700,
regarding Java packages need to retain references
to be marked as done.

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29700: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29700
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> --- Begin Message ---
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> Subject: 
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> Java packages need to retain references
>
>
>
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> Date: 
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> Wed, 13 Dec 2017 23:48:24 +0100
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> User-agent: 
>
> mu4e 0.9.18; emacs 25.3.1
>
>
>
>
> I installed the “axoloti-patcher” package today after “guix gc” and
> noticed that not all dependencies are available at runtime.  Upon
> running the “Axoloti” command I got this error:
>
>     Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: 
> Can't load library: 
> /gnu/store/nrx5nmwynmsl7aqxdpgwpsm8ff9b0h4d-libusb4java-0-1.396d642a5/lib/libusb4java.so
>
> The store item does not exist.
>
> The problem here is that jar archives are compressed and thus any
> references they contain are thus hidden from the scanner.
>
> I don’t know if it is feasible to disable compression for jar files, or
> if we should install a “.guix-dependencies” file that contains plain
> text references.
>
> I’ll investigate disabling compression first.  Looks like we can do this
> in the strip-jar-timestamps phase where we use “zip” to repack the jar.
> Adding “-0” to the arguments should be enough to make this work.
>
> I’ll send a patch soon.
>
> --
> Ricardo
>
> GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
> https://elephly.net
>
>
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> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#29700: Java packages need to retain references
>
>
>
>
> Date: 
>
> Thu, 14 Dec 2017 23:59:22 +0100
>
>
>
>
> User-agent: 
>
> mu4e 0.9.18; emacs 25.3.1
>
>
>
>
> Hi Gábor,
>
> The manifest file would not be sufficient.  Take the example of
> “java-usb4java”.  It provides a file “share/java/usb4java.jar”, which
> contains this manifest:
>
> --8<---------------cut here---------------start------------->8---
> Manifest-Version: 1.0
> Created-By: 1.7.0_161 (Oracle Corporation)
>
> --8<---------------cut here---------------end--------------->8---
>
> When you open the Loader.class file that is included in the archive you
> will notice that it contains this string:
>
>     
> /gnu/store/iwjqaqr98daqbgwswqi5fi4w891bqh7d-libusb4java-0-1.396d642a5/lib/libusb4java.so
>
> This reference is currently dropped because it cannot be detected in a
> compressed archive.  The reference is not contained in the manifest, and
> at build time we could only guess which references should be added to
> the manifest.
>
> Unless we extend the reference scanner to deal with compressed files I
> think that disabling compression in jars is the best approach.
>
> I’ll push this to master.
>
> --
> Ricardo
>
> GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
> https://elephly.net
>
>
>
>
> --- End Message ---