Java HotSpot Virtual Machine

Hi,

I am testing JNI code sample. JVM is not loading the native library. It says: Exception in thread "main" java.lang.UnsatisfiedLinkError: no helloWorld.so in java.library.path

These are the code details:

//HelloWorld.java

package jni.test;

import java.lang.reflect.*;

public class HelloWorld
{
public native void displayMessage();
static
{
try{
System.out.println(System.getProperty("java.library.path"));
System.loadLibrary("helloWorld.so");
}catch(Exception err){
err.printStackTrace();
}
}
public static void main(String args[]){
HelloWorld h = new HelloWorld();
h.displayMessage();
}
}


// jni_test_HelloWorld.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class jni_test_HelloWorld */

#ifndef Includedjni_test_HelloWorld
#define Includedjni_test_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: jni_test_HelloWorld
* Method: displayMessage
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_jni_test_HelloWorld_displayMessage
(JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

//HelloWorld.c

include <stdio.h>
#include <jni.h>
#include "jni_test_HelloWorld.h"

JNIEXPORT void JNICALL Java_jni_test_HelloWorld_displayMessage
(JNIEnv *env, jobject obj)
{
printf("Hello World!\n");
}

Generated so file with this command:


gcc -shared -O6 -fPIC -I/usr/java/jdk1.5.0_01//include -I/usr/java/jdk1.5.0_01//include/genunix -I/usr/java/jdk1.5.0_01//include/linux -Dlinux -nostdlib -nostartfiles HelloWorld.o -o helloWorld.so

test_jni.sh

export LD_LIBRARY_PATH=/home/ravindrak/exp
export CLASSPATH=.:
#/usr/java/jdk1.5.0_01/bin/java -Djava.library.path=.:/home/ravindrak/exp -classpath .: jni.test.HelloWorld
/usr/java/jdk1.5.0_01/bin/java -Djava.library.path=.:/home/ravindrak/exp jni.test.HelloWorld

.:/home/ravindrak/exp
Exception in thread "main" java.lang.UnsatisfiedLinkError: no helloWorld.so in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
at java.lang.Runtime.loadLibrary0(Runtime.java:822)
at java.lang.System.loadLibrary(System.java:992)
at jni.test.HelloWorld.<clinit>(HelloWorld.java:12)

But helloWorld.so file is available in the same location: /home/ravindrak/exp

The system is reporting the library path correctly but not loading the library.

Pls tell me the solution

Thanks and Regards,

Ravindra