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

[Petri Hintukainen]

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
> > 
> > _______________________________________________
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> > libbluray-devel at videolan.org
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