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

Vitor Dall'Acqua veggav at gmail.com
Sat Jan 23 20:43:49 UTC 2021 

Well, I'm no expert but when I tried to add it along with other libraries
it ended up in the same folder along with all other libs.

On Sat, Jan 23, 2021 at 5:42 PM Shaya Potter <spotter at gmail.com> wrote:

> I'm guessing you mean, one can't add directories in an apk?
>
> On Sat, Jan 23, 2021 at 10:38 PM Vitor Dall'Acqua <veggav at gmail.com>
> wrote:
>
>> Yes, I'm adding it to the apk, the problem is that if I set it like this:
>>
>>  #undef JDK_HOME
>>   #define JDK_HOME "/lib/arm64/"
>>
>> It needs to look at the root of JDK_HOME. I can't add folders.
>> And from the looks of the log it will look for it in
>> /lib/arm64/jre/lib/aarch64/server/libjvm.so
>>
>> On Sat, Jan 23, 2021 at 5:33 PM Shaya Potter <spotter at gmail.com> wrote:
>>
>>> so seems related to the issue I mentioned
>>>
>>>
>>> https://stackoverflow.com/questions/59608865/library-is-not-accessible-for-the-namespace-classloader-namespace
>>>
>>> seems to be that the solution is that you will have to include it in the
>>> apk itself.
>>>
>>> On Sat, Jan 23, 2021 at 10:26 PM Vitor Dall'Acqua <veggav at gmail.com>
>>> wrote:
>>>
>>>> Well... managed to get it to see...
>>>>
>>>> 2021-01-23 18:21:35.375 T:19738   DEBUG <general>:
>>>> CBlurayCallback::Logger - bdj.c:311: Opening
>>>> /storage/emulated/0/JAVA/jre/lib/aarch64/server/libjvm ...
>>>>
>>>> 2021-01-23 18:21:35.377 T:19738   DEBUG <general>:
>>>> CBlurayCallback::Logger - dl_posix.c:54: can't open library
>>>> '/storage/emulated/0/JAVA/jre/lib/aarch64/server/libjvm.so': dlopen failed:
>>>> library "/storage/emulated/0/JAVA/jre/lib/aarch64/server/libjvm.so" needed
>>>> or dlopened by
>>>> "/mnt/expand/cab01563-bcca-48fa-a0bf-0fbddaf9b192/app/org.xbmc.kodi19DV-BHAaVSj7u8lhvDk_OSQttQ==/lib/arm64/libkodi.so"
>>>> is not accessible for the namespace "classloader-namespace"
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Sat, Jan 23, 2021 at 3:30 PM Shaya Potter <spotter at gmail.com> wrote:
>>>>
>>>>>
>>>>> i looked at what they call "source code", its not source (unless I'm
>>>>> missing it).  It's just the pre built binaries.
>>>>>
>>>>> I didn't say that google did that exactly, I said, I think they have
>>>>> made it difficult to put executables there in Android Q (with that said,
>>>>> might not be a near term proble if the app isn't targeted specifically to
>>>>> android Q's API level, which kodi probably is not).  What I also said, I
>>>>> dont know how that would impact dlopen (which is not directly executing the
>>>>> program) if android would block that as well.
>>>>>
>>>>> with that said, I'd still think (perhaps incorrectly) from a security
>>>>> point of view, kodi would want to ship the jvm within their apk as this
>>>>> would prevent external things from breaking it and not have it provided by
>>>>> the user (then again, on all desktop environments it is provided by the
>>>>> user).
>>>>>
>>>>> for reference where I came across a discussion a bit ago:
>>>>> https://www.reddit.com/r/androiddev/comments/b2inbu/psa_android_q_blocks_executing_binaries_in_your/
>>>>>
>>>>> if I had to guess, it probably would work for now (even on Q), but in
>>>>> the future there might be issues as google prevents older and older api
>>>>> targets from being updated in the play store.
>>>>>
>>>>> On Sat, Jan 23, 2021 at 8:08 PM Vitor Dall'Acqua <veggav at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> But Shaya, the source is present in the linked file here.
>>>>>>
>>>>>> The thing is that it's beyond my capabilities try to add this to Kodi
>>>>>> as a dependency.
>>>>>> Also another problem I'm seeing here is that while I'm able to pack
>>>>>> into an apk the libjvm.so so it is installed when you install Kodi, this
>>>>>> isn't the case for the .jar files.
>>>>>>
>>>>>> You mentioned that Google made sure to close down the possibility of
>>>>>> loading a .so file from outside the app folder?
>>>>>> So you think even if libbluray could read /storage/emulated/0/ it
>>>>>> would fail in use the libjvm?
>>>>>>
>>>>>> On Sat, Jan 23, 2021 at 2:30 PM Shaya Potter <spotter at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> vitor, I'd think that kodi's path manipulation wouldn't impact the
>>>>>>> jre at all.  It's just for internal kodi use for themes and media and the
>>>>>>> like, but nothing to do with OS operations (and petri can verify if this or
>>>>>>> true, motivated the need for libbluray to have the ability to a pluggable
>>>>>>> set of file system operations that could be provided to it).  But while
>>>>>>> libbluray can use the a provided set of operations, the jvm can't.
>>>>>>>
>>>>>>> I'd think one of your goals should be to get the group that made
>>>>>>> those jvm binaries to release the source and build for it, then kodi can
>>>>>>> include it as part of their build process and even ship with it in the play
>>>>>>> store.  I'd think vlc would be interested in this, as well?  This would
>>>>>>> also be necessary as would have to ship different jvm's for 32 bit kodi and
>>>>>>> 64 bit.
>>>>>>>
>>>>>>> On Sat, Jan 23, 2021 at 2:22 PM Vitor Dall'Acqua <veggav at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Petri, do you happen to have the source with your latest changes?
>>>>>>>>
>>>>>>>> code.videolan.org is down and I would like to work on this during
>>>>>>>> the weekend.
>>>>>>>>
>>>>>>>> On Fri, Jan 22, 2021 at 6:08 PM Petri Hintukainen <
>>>>>>>> phintuka at users.sourceforge.net> wrote:
>>>>>>>>
>>>>>>>>> pe, 2021-01-22 kello 16:54 -0300, Vitor Dall'Acqua kirjoitti:
>>>>>>>>> > 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?
>>>>>>>>>
>>>>>>>>> Structure seems to be normal. I think you need only files from
>>>>>>>>> /jdk8/jre/ and maybe from /glib/ (?).
>>>>>>>>>
>>>>>>>>> JAVA_HOME would point to .../jdk8/ or .../jdk8/jre/. Or, you could
>>>>>>>>> try
>>>>>>>>> if simply symlinking .../jdk8/jre/lib/aarch64/server/libjvm.so
>>>>>>>>> next to
>>>>>>>>> libbluray.so works.
>>>>>>>>>
>>>>>>>>> The files in top-level bin folder are wrapper scripts. Looking at
>>>>>>>>> those, you may need to set LD_LIBRARY_PATH so that libraries from
>>>>>>>>> /glib
>>>>>>>>> can be found. But I don't know if JVM needs those, or if those are
>>>>>>>>> only
>>>>>>>>> used with some of the applications.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> libbluray-devel mailing list
>>>>>>>>> libbluray-devel at videolan.org
>>>>>>>>> https://mailman.videolan.org/listinfo/libbluray-devel
>>>>>>>>>
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