Probleme avec JNA

Bonjour,

Je suis entrain d'utiliser matlab en passant par JNA. Cependant, j'ai un petit souci que je ne comprends pas trop si quelqu'un à la réponse, je suis preneur....

voila mon code

Code:

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public class TestJNA 
{

	public interface JNAMatlab extends Library 
	{
		int engClose();
		int engEvalString(String param);
		int engGetVisible(boolean bool);
		int engSetVisible(boolean bool);
		void engOpen(String cmd);
		
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) 
	{
	 
	    String libName = ""; 
	    if (System.getProperty("os.name").contains("Windows")) 
	    { 
	      libName = "libeng";  
	    } 
	    
	    JNAMatlab demo = (JNAMatlab) Native.loadLibrary(libName, JNAMatlab.class); 
	    demo.engOpen(null);
	    demo.engSetVisible(true); //permet de rendre le server matlab visible
    
	}
}

Lorsque j'appelle "demo.engOpen(null)", matlab se lance correctement, pas de souci par contre lorsque j'appelle "demo.engOpen()" puis "demo.engSetVisible()" ou lorsque j'appelle uniquement "demo.engsetVisible()" j'obtiens ce probleme....

Code:

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#
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x031812aa, pid=3824, tid=2444
#
# Java VM: Java HotSpot(TM) Client VM (11.2-b01 mixed mode, sharing windows-x86)
# Problematic frame:
# C  [libeng.dll+0x12aa]
#
# An error report file with more information is saved as:
# D:\Eclipse_3.4_OBEO\workspace\test.jna.matlab\hs_err_pid3824.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#