Error in simple JNI project

Question

hi,
I am new to JNI and I am trying a simple HelloWorld project but I am getting the following exception :
Exception in thread "main" java.lang.UnsatisfiedLinkError: displayHelloWorld
               at HelloWorld.displayHelloWorld(Native Method)
               at HelloWorld.main(HelloWorld.java) where comes my error from?

Answer 1

c header
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloWorld */
#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
* Class:     HelloWorld
* Method:    displayHelloWorld
* Signature: ()V
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld
  (JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endifimplementation for native
#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
JNIEXPORT void JNICALL
Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
    printf("Hello world!\n");
    return;
}