64 bit JVM Crash when loading shared library

Question

I wrote a simple code to test loading of 64 bit shared library in linux. My JVM crashes on System.loadLibrary method.
JAVA CODE
import java.awt.Dimension;
import javax.swing.JFrame;
public class TestJNI extends JFrame{
        public native void init();
        static{
                System.loadLibrary("testJNI");
        public static void main(String ...args){
                TestJNI test = new TestJNI();
                test.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                test.setSize(new Dimension(500,500));
                test.setVisible(true);
                System.out.println("Before init");
                //test.init();
                System.out.println("After init");
} Header file created using javah
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class TestJNI */
#ifndef _Included_TestJNI
#define _Included_TestJNI
#ifdef __cplusplus
extern "C" {
#endif
#undef TestJNI_FOCUS_TRAVERSABLE_UNKNOWN
#define TestJNI_FOCUS_TRAVERSABLE_UNKNOWN 0L
#undef TestJNI_FOCUS_TRAVERSABLE_DEFAULT
#define TestJNI_FOCUS_TRAVERSABLE_DEFAULT 1L
#undef TestJNI_FOCUS_TRAVERSABLE_SET
#define TestJNI_FOCUS_TRAVERSABLE_SET 2L
#undef TestJNI_TOP_ALIGNMENT
#define TestJNI_TOP_ALIGNMENT 0.0f
#undef TestJNI_CENTER_ALIGNMENT
#define TestJNI_CENTER_ALIGNMENT 0.5f
#undef TestJNI_BOTTOM_ALIGNMENT
#define TestJNI_BOTTOM_ALIGNMENT 1.0f
#undef TestJNI_LEFT_ALIGNMENT
#define TestJNI_LEFT_ALIGNMENT 0.0f
#undef TestJNI_RIGHT_ALIGNMENT
#define TestJNI_RIGHT_ALIGNMENT 1.0f
#undef TestJNI_serialVersionUID
#define TestJNI_serialVersionUID -7644114512714619750LL
#undef TestJNI_serialVersionUID
#define TestJNI_serialVersionUID 4613797578919906343LL
#undef TestJNI_INCLUDE_SELF
#define TestJNI_INCLUDE_SELF 1L
#undef TestJNI_SEARCH_HEAVYWEIGHTS
#define TestJNI_SEARCH_HEAVYWEIGHTS 1L
#undef TestJNI_OPENED
#define TestJNI_OPENED 1L
#undef TestJNI_serialVersionUID
#define TestJNI_serialVersionUID 4497834738069338734LL
#undef TestJNI_DEFAULT_CURSOR
#define TestJNI_DEFAULT_CURSOR 0L
#undef TestJNI_CROSSHAIR_CURSOR
#define TestJNI_CROSSHAIR_CURSOR 1L
#undef TestJNI_TEXT_CURSOR
#define TestJNI_TEXT_CURSOR 2L
#undef TestJNI_WAIT_CURSOR
#define TestJNI_WAIT_CURSOR 3L
#undef TestJNI_SW_RESIZE_CURSOR
#define TestJNI_SW_RESIZE_CURSOR 4L
#undef TestJNI_SE_RESIZE_CURSOR
#define TestJNI_SE_RESIZE_CURSOR 5L
#undef TestJNI_NW_RESIZE_CURSOR
#define TestJNI_NW_RESIZE_CURSOR 6L
#undef TestJNI_NE_RESIZE_CURSOR
#define TestJNI_NE_RESIZE_CURSOR 7L
#undef TestJNI_N_RESIZE_CURSOR
#define TestJNI_N_RESIZE_CURSOR 8L
#undef TestJNI_S_RESIZE_CURSOR
#define TestJNI_S_RESIZE_CURSOR 9L
#undef TestJNI_W_RESIZE_CURSOR
#define TestJNI_W_RESIZE_CURSOR 10L
#undef TestJNI_E_RESIZE_CURSOR
#define TestJNI_E_RESIZE_CURSOR 11L
#undef TestJNI_HAND_CURSOR
#define TestJNI_HAND_CURSOR 12L
#undef TestJNI_MOVE_CURSOR
#define TestJNI_MOVE_CURSOR 13L
#undef TestJNI_NORMAL
#define TestJNI_NORMAL 0L
#undef TestJNI_ICONIFIED
#define TestJNI_ICONIFIED 1L
#undef TestJNI_MAXIMIZED_HORIZ
#define TestJNI_MAXIMIZED_HORIZ 2L
#undef TestJNI_MAXIMIZED_VERT
#define TestJNI_MAXIMIZED_VERT 4L
#undef TestJNI_MAXIMIZED_BOTH
#define TestJNI_MAXIMIZED_BOTH 6L
#undef TestJNI_serialVersionUID
#define TestJNI_serialVersionUID 2673458971256075116LL
#undef TestJNI_EXIT_ON_CLOSE
#define TestJNI_EXIT_ON_CLOSE 3L
* Class:     TestJNI
* Method:    init
* Signature: ()V
JNIEXPORT void JNICALL Java_TestJNI_init
  (JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endifC code TestJNI.c
#include "TestJNI.h"
#include <stdio.h>
JNIEXPORT void JNICALL Java_TestJNI_init
  (JNIEnv *env, jobject ob){
  printf("TESTING JNI CALL");
}gcc options are as follows to get the shared library:
gcc -fPIC -pthread -g -Wall -D_REENTRANT -I/vobs/3p/jdk1.6.0_10/linux/include/linux -I/vobs/3p/jdk1.6.0_10/linux/include/ -c TestJNI.c -o TestJNI.o
gcc -z defs -pthread -D_REENTRANT -Wl,-soname,libnative.so -shared -o libtestJNI.so TestJNI.o -lcAny help is appreciated. I am not sure what i am doing wrong here.
Running the same code on a 32 bit jvm with a 32 bit shared library works.

Answer 1

Hi,
I was also having a problem under 64 bit, Now I am certain that if ur Java code makes a call to the DLL, make sure that DLL is compiled under 64 bit compiler and not 32 bit compiler. This is the mistake I made and the JVM was throwing unsatisfied link error. Now this DLL (compiled under 64 bit) could call a 32 bit dll, I dont think that should be a problem.
Hope it helps.
Subu