Re: Issues with JNI on Mono (IKVM Trunk)

This was harder to track down, but the line in Sys.java that defines a
native method, getPointerSize() is implemented here
https://github.com/LWJGL/lwjgl/blob/bafa7a1972718abf0f2304124a46ae3fa67be7df/src/native/common/common_tools.c#L64
.
 I'm not sure what is wrong with that code if it works on windows, odd.


On Fri, Jul 18, 2014 at 5:37 PM, Tommy Ettinger <[email protected]>
wrote:

> I solved the trace issue, but the program still can't get past a part
> where a Java library loads native code at runtime, and I have the output
> here http://pastebin.com/q9xCBzsV .  It has the JNI traces in that.  The
> issue seems to be related to dynamically loading libraries in JNI code; the
> exact line it fails on is
> https://github.com/LWJGL/lwjgl/blob/master/src/java/org/lwjgl/Sys.java#L113
> .  It is entirely possible that LibGDX distributes a modified version of
> LWJGL; I've tried swapping the jars and it has slightly different behavior
> if the DLLs and JARs are not from the same project (it acts fine if they
> come both from LWJGL 2.9.1 or both from a LibGDX nightly build, but still
> has the same error on linux either way).  Right now my code uses this
> App.config (
> https://github.com/tommyettinger/CommandersUnite/blob/master/CU/CU/App.config )
> and it refers to these libraries from IKVM: (
> https://github.com/tommyettinger/CommandersUnite/blob/master/CU/CU/CU.csproj#L99-L153 ).
>  LibGDX was compiled to a DLL, gdx-cli.dll , using this command:
> "%IKVM_HOME%/ikvmc.exe" -target:library -out:gdx-cli.dll
> -sharedclassloader gdx.jar gdx-natives.jar gdx-backend-lwjgl.jar
> gdx-backend-lwjgl-natives.jar
> Do you have an idea of what could cause the problem I'm having?
>
>
>
> On Thu, Jul 17, 2014 at 1:06 AM, Jeroen Frijters <[email protected]>
> wrote:
>
>> You should really ask on the Mono list about this. I don't know enough
>> about Mono on Linux, but this looks seriously broken.
>>
>> > -----Original Message-----
>> > From: Tommy Ettinger [mailto:[email protected]]
>> > Sent: Wednesday, July 16, 2014 22:56
>> > To: Jeroen Frijters
>> > Cc: [email protected]
>> > Subject: Re: [Ikvm-developers] Issues with JNI on Mono (IKVM Trunk)
>> >
>> > Ah, figured out how to load the config on Mono.  I think.  Unfortunately
>> > it gives a very different error: http://pastebin.com/GAsQyfA5 The
>> > App.config is here
>> >
>> https://github.com/tommyettinger/CommandersUnite/blob/master/CU/CU/App.c
>> > onfig
>> >
>> >
>> > On Wed, Jul 16, 2014 at 1:30 PM, Tommy Ettinger
>> > <[email protected] <mailto:[email protected]> > wrote:
>> >
>> >
>> >       My last message was too long for the list, so here it is with
>> > pastebin links.
>> >       With those lines added to App.config, It gives the following
>> output
>> > on Windows 7 in Visual Studio's output window (and nothing new on Mono):
>> >       Visual Studio output: http://pastebin.com/6Jpi5FxV
>> >       Mono output: http://pastebin.com/BEMyAerk
>> >
>> >       Thanks for your speedy reply on this, IKVM worked brilliantly
>> until
>> > I tried to get it to run on Mono.  IKVM is a pretty incredible piece of
>> > software.
>> >
>> >
>> >       On Wed, Jul 16, 2014 at 6:01 AM, Jeroen Frijters <
>> [email protected]
>> > <mailto:[email protected]> > wrote:
>> >
>> >
>> >               Hi Tommy,
>> >
>> >
>> >
>> >               Can you try enabling JNI tracing by adding the following
>> to
>> > your app.config:
>> >
>> >
>> >
>> >               <system.diagnostics>
>> >
>> >               <switches>
>> >
>> >               <add name="jni" value="4" />
>> >
>> >               </switches>
>> >
>> >               </system.diagnostics>
>> >
>> >
>> >
>> >               Regards,
>> >
>> >               Jeroen
>> >
>> >
>> >
>> >               From: Tommy Ettinger [mailto:[email protected]
>> > <mailto:[email protected]> ]
>> >               Sent: Wednesday, July 16, 2014 14:00
>> >               To: [email protected] <mailto:ikvm-
>> > [email protected]>
>> >               Subject: [Ikvm-developers] Issues with JNI on Mono (IKVM
>> > Trunk)
>> >
>> >
>> >
>> >               I've been struggling for the last two days to port my C#
>> IKVM
>> > application that uses the Java library libgdx to Linux.  The application
>> > works just fine on Windows/.NET, but something is wrong with the linking
>> > for JNI code AFAICT.  Using libgdx you have a choice of backends for how
>> > to display graphics, one of which is LWJGL and one of which is JGLFW.
>> > LWJGL failed on both 32- and 64-bit Linux (after I figured out how to
>> > get it to load its dependencies from the right folder) with an
>> > UnsatisfiedLinkError in
>> > org.lwjgl.DefaultSysImplementation.getPointerSize()I , which (in the
>> > LWJGL source) is a native method with no body in the .java file.
>> >
>> >
>> >               JGLFW failed on 64-bit Linux (haven't built it on 32-bit)
>> > with a different error, still in a native method:
>> >
>> >               java.lang.UnsatisfiedLinkError:
>> > com/badlogic/jglfw/Glfw.glfwInitJni()Z
>> >
>> >                         at cli.IKVM.Runtime.JNI$Frame.GetFuncPtr(Unknown
>> > Source)
>> >
>> >               I have had issues setting LD_LIBRARY_PATH on this machine
>> (a
>> > VM running Fedora 20, 64-bit; the VM is run by VirtualBox on Windows 7
>> > 64-bit), and I believe java.library.path is unset, but the libraries are
>> > all in the current folder (same as the exe).  My application is open
>> > source and the latest code is at
>> > https://github.com/tommyettinger/CommandersUnite/ and the only IKVM-
>> > specific code is in
>> >
>> https://github.com/tommyettinger/CommandersUnite/blob/master/CU/CU/GameG
>> > DX.cs#L478 .  I built gdx-jglfw.dll using the command:
>> >
>> >               "%IKVM_HOME%/ikvmc.exe" -target:library
>> -out:gdx-jglfw.dll -
>> > sharedclassloader gdx.jar gdx-natives.jar gdx-backend-jglfw.jar gdx-
>> > backend-jglfw-natives.jar
>> >
>> >               where %IKVM_HOME% evaluated to the bin directory of the
>> > current trunk/head/master (latest) of the IKVM CVS on SourceForge (it
>> > actually may have been the latest nightly from the IKVM weblog, it is a
>> > version 8 or higher nightly).  That command was run on the libgdx 1.2.0
>> > binary release.  I then extracted the dll and so files from the natives
>> > jars, copied them into the project, and set them to copy into the
>> > release directory.
>> >
>> >               So my question is, is there a bug in my code, or in IKVM,
>> > here that can be fixed?  Does JNI work at all under Mono/Linux?
>> >
>> >
>> >
>> >               --
>> >
>> >               Thomas (Tommy) Ettinger
>> >
>> >
>> >
>> >
>> >
>> >       --
>> >
>> >       Thomas (Tommy) Ettinger
>> >
>> >
>> >
>> >
>> > --
>> >
>> > Thomas (Tommy) Ettinger
>>
>
>
>
> --
>
> Thomas (Tommy) Ettinger
>



-- 

Thomas (Tommy) Ettinger

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