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Re: "cannot find the required native library named

• To: mathgroup at smc.vnet.net
• Subject: [mg91623] Re: "cannot find the required native library named
• From: Sascha Kratky <skratky at gmail.com>
• Date: Fri, 29 Aug 2008 04:25:32 -0400 (EDT)
• References: <g93b22$klo$1@smc.vnet.net>

On Aug 27, 12:42 pm, te... at iNumen.com wrote:
> I searched this error in MathGroup and I see there is one that happened
> to Linux.
>
> http://forums.wolfram.com/mathgroup/archive/2007/Apr/msg00078.html
>
> It is happening to me in Windows Server 2003 x64.  I am trying to call
> MathLinkFactory.createKernelLink()
>
>         String strArg = "-linkmode launch -linkname 'C:\\Progra=
m Files
> (x86)\\Wolfram Research\\Mathematica\\6.0\\MathKernel.exe'";
>         KernelLink ml = null;
>
>         try {
>             ml = MathLinkFactory.createKernelLink(strArg);
>         } catch (MathLinkException e) {
>             System.out.println("Fatal error opening link: " +
> e.getMessage());
>             return;
>         }
>
> And I get the following error.
>
>     Fatal error: cannot find the required native library named
>     JLinkNativeLibrary.
>     Exception in thread "main" java.lang.UnsatisfiedLinkError:
>     com.wolfram.jlink.NativeLink.MLOpenString(Ljava/lang/String;[Ljav=
a/lang/Str ing;)J
>         at com.wolfram.jlink.NativeLink.MLOpenString(Native Metho=
d)
>         at com.wolfram.jlink.NativeLink.<init>(NativeLink.java:11=
3)
>         at
>     com.wolfram.jlink.MathLinkFactory.createMathLink0(MathLinkFactory=
.java:263)
>         at
>     com.wolfram.jlink.MathLinkFactory.createMathLink(MathLinkFactory.=
java:190)
>         at
>     com.wolfram.jlink.MathLinkFactory.createKernelLink0(MathLinkFacto=
ry.java:16 7)
>         at
>     com.wolfram.jlink.MathLinkFactory.createKernelLink(MathLinkFactor=
y.java:65)
>         at SampleProgram.SampleProgram.main(SampleProgram.java:54=
)
>
> As pointed out in the link above, calling
> MathLinkFactory.createKernelLink(""); gives the same error.
>
> I see that the JLinkNativeLibrary.dll is in
> Mathematica\6.0\SystemFiles\Links\JLink\SystemFiles\Libraries\Windows-x86=
-6 4.  
> How can make JLink work without this error?
>
> Thank you.

JLink tries to find the JLinkNativeLibrary.dll in different locations
of the local file
system (take a look at the method NativeLink.loadNativeLibrary in the
JLink source code).

The location of the JLink installation directory can be explicitly
specified by setting
the JLINK_LIB_DIR environment variable in the Windows System control
panel
or by setting the Java system property "com.wolfram.jlink.libdir",
i.e.,

try {
    String jLinkDir = "C:\\Program Files (x86)\\Wolfram Research\
\Mathematica\\6.0\\SystemFiles\\Links\\JLink";
    System.setProperty("com.wolfram.jlink.libdir", jLinkDir);
    ml = MathLinkFactory.createKernelLink(strArg);
    ...

Regards,
Sascha