Java.lang.UnsatisfiedLinkError with JMatLink under Mac OS X Leopard 10.5.5

Question

Dear group,
I'm trying to build and use JMatLink (provides a matlab engine, callable from java) in my Intel Mac running Mac OSX 10.5.5, with Matlab 7.4 (2007a) installed.
To build the library (libJMatLink.jnilib), I'm using a makefile (see end of post) adapted from one suggested here
It compiles fine, but some strange things (for me) are happening, with the relative path of the matlab libs
Leporello:jmatlink miguel$ ldd libJMatLink.so
libJMatLink.so:
libJMatLink.so (compatibility version 0.0.0, current version 0.0.0)
../../bin/maci/libeng.dylib (compatibility version 0.0.0, current version 0.0.0)
../../bin/maci/libmx.dylib (compatibility version 0.0.0, current version 0.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.1)When I try to run a simple example, Zbr.java, in which I call
System.loadLibrary( "JMatLink" );I constantly get
Exception in thread "main" java.lang.UnsatisfiedLinkError: /Volumes/Users/miguel/Desktop/JMatLink130/libJMatLink.jnilib:
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1822)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1739)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1030)
at Zbr.main(Zbr.java:12)whether I run it
${JAVA} Zbr
${JAVA} -Djava.library.path=/Users/miguel/Desktop/JMatLink130  Zbror even make a jar with Zbr.class, libJMatLink.jnilib and the jmatlink directory, and put it somewhere else (/Users/miguel)
${JAVA} -classpath /Users/miguel/a.jar Zbrwhere
JAVA=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home/bin/java
My environment has
echo $PATH/sw/bin:/sw/sbin:/usr/local/git/bin:/Users/miguel/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin:/usr/texbin:/usr/local/HTS-2.1/bin:/usr/local/SPTK/bin:/opt/local/bin:/Applications/MATLAB74/bin:/Applications/MATLAB74/bin/maci:/usr/X11R6/bin
echo $DYLD_LIBRARY_PATH/Applications/MATLAB74/bin/maciAs a last curiosity, when I use jdk 1.5 instead of 1.6 to compile and run my example, no exception is thrown!
I can't figure out whether this is a problem of my settings or the compilation itself...
I really need this working to continue developing, and any help you could dispense me will be greatly appreciated.
Miguel
Makefile:
CC=gcc-4.0
LD=gcc-4.0
# MATLAB
MATLAB=/Applications/MATLAB74
CFLAGS = -I$(MATLAB)/extern/include -fno-common -no-cpp-precomp -fexceptions
CDEBUGFLAGS = -g
COPTIMFLAGS = -O3 -DNDEBUG
CLIBS = -L$(MATLAB)/bin/maci -leng -lmx -lstdc++
arguments = -DMX_COMPAT_32
LDFLAGS = -O -Wl,-flat_namespace -undefined suppress
# JAVA
JAVA=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home
JINCLUDE = -I$(JAVA)/include
libJMatlink.jnilib  : libJMatLink.so
cp libJMatLink.so libJMatlink.jnilib
libJMatlink.so  : JMatLink.o
$(LD) -dynamiclib $(LDFLAGS) $(CLIBS) -o libJMatLink.so JMatLink.o
JMatLink.o  : JMatLink.c JMatLink.h
$(CC) $(CFLAGS) $(JINCLUDE) $(MINCLUDE) -c JMatLink.c
clean:
rm -f *.o
rm -f *.so
rm -f *.class

Answer 1

Hi jschell, thx for sticking with me on this one :)
1. You are not creating the library. Did you verify a file with the correct extension exists?
3. Could also be just a permissions problem.Library is there...and permissions seem ok
Leporello:JMatLink130 miguel$ ls -l libJMatLink.jnilib
-rwxr-xr-x  1 miguel  staff  17968  3 Dec 14:46 libJMatLink.jnilibWhich kind of only leaves this possibility...
2. There is something wrong in the way you created the library. Wrong in such a way that the VM is refusing to find it.I've tried deriving the compilation procedure directly from apple, but problem persists.
libJMatLink.jnilib: JMatLink.o
     $(LD) -bundle -o libJMatLink.jnilib JMatLink.o -L/Applications/MATLAB74/bin/maci -leng -lmx -lstdc++ -framework JavaVM
JMatLink.o: JMatLink.c JMatLink.h
     $(CC) -c -I/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Headers -I/Applications/MATLAB74/extern/include JMatLink.cYet again, jdk1.5 is not affected by this.
You aware of any significant changes to the jni implementation/interface between jdk1.6 and jdk1.5... even if only on the mac side?
miguel
Edited by: miguelvaz on Dec 4, 2008 12:08 AM