Exception in thread "main" java.lang.UnsatisfiedLinkError

I get the following explicit error when I test JNI in Java:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Italk2learn.hello()V
    at Italk2learn.hello(Native Method)
    at Italk2learn.main(Italk2learn.java:10)

There's no problem with the dll or paths because the static code of the my java class works well:

static {
        try {
            System.loadLibrary("Italk2learn");
        } catch (Exception e) {
            System.err.println(e);
            System.exit(1);
        }
    }

And I think that it gets the library fine.

I use JVM 32 bits to compile and get the C++ header(javah) and MinGW32 for C++. In both cases I use eclipse for C++ and Java.

This is my code:

Java:

public class Italk2learn {

    public native void hello();

    public static void main(String[] args) {
        System.out.println("Hello World Java!");
        try {
            new Italk2learn().hello();
        } catch (Exception e) {
            System.err.println(e);
            System.exit(1);
        }
    }
    static {
        try {
            System.loadLibrary("Italk2learn");
        } catch (Exception e) {
            System.err.println(e);
            System.exit(1);
        }
    }
}

C++ :

#include <jni.h>
#include <stdio.h>
#include "italk2learn.h"

JNIEXPORT void JNICALL Java_Italk2learn_hello(JNIEnv *, jobject) {
    printf("Hello World C++!\n");
#ifdef __cplusplus
    printf("__cplusplus is defined\n");
#else
    printf("__cplusplus is NOT defined\n");
#endif
    return;
}