Issues with JNI on Mono (IKVM Trunk)

Tommy Ettinger <[email protected]>
Newsgroups gmane.comp.java.ikvm.devel
Message-ID <CAAWSfZNYjnEF0Y8pi2fm057Jgv32fH3-Cjv_w2-0DD0ayBhTYw@mail.gmail.com>
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/GameGDX.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

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