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

[Vitor Dall'Acqua]

by the way, there's no libjvm.so present.

We do have libjava.so, could this be the one we need?

On Fri, Jan 22, 2021 at 4:54 PM Vitor Dall'Acqua <veggav at gmail.com> wrote:

> 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
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>>
>>
>>
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