[libbluray-devel] Found a JRE compiled for Android (ARM)

[Vitor Dall'Acqua]

I have not tried to build Java from source.

The version used by Termux, can be found as pre compiled and source here:
https://github.com/Hax4us/java/releases/download/v8/jdk8_aarch64.tar.gz

I can give a go with Kodi, which is what I'm familiar with, to git clone
the latest changes from libbluray, add the lib/arm/client to it and add the
files from that archive linked here.
Does it still need a bin folder inside? is the structure correct there?




On Fri, Jan 22, 2021 at 4:34 PM Petri Hintukainen <
phintuka at users.sourceforge.net> wrote:

> to, 2021-01-21 kello 00:11 +0200, Shaya Potter kirjoitti:
> > I can't speak to any specifics, but there are some obvious issues
> > that would prevent libbluray from loading it.
> >
> > libbluray searches for the the java root dir in a number of places
> > (including the JAVA_HOME env)
> >
> > from the root dir, it searches in a number of subdir's for libjvm.so
> >
> > the dirs it searches are
> >
> >     static const char * const jvm_dir[]  = {"jre/lib/" JAVA_ARCH
> > "/server",
> >                                             "lib/server",
> >                                             "lib/client",
> >
> > it turns out that none of those dirs are where this jvm stores
> > libjvm.so.  it stores it in "lib/arm/client".
> >
> > hence it can't find it.  a simple experiment would be for you to
> > build your own libbluray and add "lib/arm/client" or perhaps even
> > "lib" JAVA_ARCH "/client" (again, unsure) and see if that improves
> > the situation.
>
> I've added these to libbluray git.
>
> > with that said, I have some skepticism that it can work when loaded
> > into the shared data partition as google has gone through efforts to
> > lock down executable code being stored there, with that said, I don't
> > know how that impact dlopen and the like and might only impact
> > Android Q users.
> >
> > but again, this is just low hanging fruit issues, dont really know
> > what it would be.  (with that said, I think the holy grail for many
> > people would be to have kodi be able to use java on android).
> >
> > The other issue is that these devs don't provide any source code for
> > the jvm that they built.  as it's under the GPL and they aren't
> > providing sources they built it from, they are arguably in violation
> > of the license.  that's going to prevent it from anyone putting
> > significant effort into it.
>
> Has anyone tried building it from sources ? Is it just about figuring
> out correct configuration options, or does it need some patching ?
>
> It would be nice to get small and compact JVM, but I don't know how
> much stripped version it is possible to build... Or if it would be
> possible to simply remove unneeded files from the image.
>
> > On Sat, Jan 2, 2021 at 4:35 AM Vitor Dall'Acqua <veggav at gmail.com>
> > wrote:
> > > Just wanted to share this with you,
> > > Someone made a JRE for Termux that runs on Android devices.
> > > https://github.com/MasterDevX/Termux-Java
> > >
> > > I've tried to add this to Kodi and setenv
> > >   setenv("JAVA_HOME", "/storage/emulated/0/JAVA/", 1);
> > >
> > > added the binaries and the *.jar files
> > >
> > > Libbluray still won't see it.
> > >
> > > DEBUG <general>: CBlurayCallback::Logger - bdj.c:746: BD-J check:
> > > Failed to load JVM library
> > >
> > > I have little to no experience with Android and how paths are set
> > > but if it's just a matter of figuring out how to set it, it would
> > > be really nice to have.
> > >
> > > Hope someone shares the sentiment and feels like having a look at
> > > it.
> > >
> > > Regards
> > > Vitor
> > >
> > > _______________________________________________
> > > libbluray-devel mailing list
> > > libbluray-devel at videolan.org
> > > https://mailman.videolan.org/listinfo/libbluray-devel
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> > libbluray-devel at videolan.org
> > https://mailman.videolan.org/listinfo/libbluray-devel
>
>
>
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