JNI Share Library Issue

[Yuri Khotyaintsev]

You cannot load a native FreeBSD library into Linux JDK.
You have to use a native JDK with this library, or install 
linux_devtools port and compile a Linux shared library.

Best,
Yuri

Daniel R. Curran wrote:

> I am trying to learn how to use JNI and I started with the Java JNI 
> tutorial <http://java.sun.com/docs/books/tutorial/native1.1/> and was 
> quickly lead around the web by google trying to figure out how to 
> construct a proper shared library. I have searched and have not found 
> anything suggesting information different than what I am doing.
> 
> I am trying to simply get the HelloWorld demo to work.
> 
> Some basic info:
> java -version
> java version "1.3.1_10"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_10-b03)
> Classic VM (build 1.3.1_10-b03, green threads, nojit)
> 
> file libhello.so
> libhello.so: ELF 32-bit LSB shared object, Intel 80386, version 1 
> (FreeBSD), not stripped
> 
> The commands I use to create and run the java program are:
> javac HelloWorld.java
> javah -jni HelloWorld
> cc -fPIC -Wall -c HelloWorldImp.c 
> -I/usr/local/linux-sun-jdk1.3.1/include 
> -I/usr/local/linux-sun-jdk1.3.1/include/linux
> ld -Bshareable -fPIC -o libhello.so HelloWorldImp.o
> export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD
> java HelloWorld
> 
> Everything is working fine until I get to the java HelloWorld call, 
> which results in the following runtime exception:
> 
> Exception in thread "main" java.lang.UnsatisfiedLinkError: 
> /usr/home/dan/programming/jni/libhello.so: 
> /usr/home/dan/programming/jni/libhello.so: ELF file OS ABI invalid
>        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
>        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1414)
>        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1338)
>        at java.lang.Runtime.loadLibrary0(Runtime.java:744)
>        at java.lang.System.loadLibrary(System.java:815)
>        at HelloWorld.<clinit>(HelloWorld.java:5)
> 
> I thought that I was doing everything correctly, but I must not be. Does 
> anyone have any idea as to how I can get this to work?
> 
> Thanks,
> Dan Curran
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> 

-- 

Yuri Khotyaintsev, PhD

Swedish Institute of Space Physics,  http://www.cluster.irfu.se/yuri 

Uppsala Division (IRF-U)             http://ovt.irfu.se