Integration error "Java" and "C" through JNI

I am not able to consume functions of a "C" lib using Java with JNI. Here are my artifacts and the error generated.

Class CalculadoraJNI :

public class CalculadoraJNI {
    // Declaração do método nativo:
    public native int calcula (int num1, int num2);
    static {
        System.loadLibrary("calcula");
    }

File TesteCalculadoraJNI.java

public class TesteCalculadoraJNI {
    public static void main (String args[]) {
        CalculadoraJNI calc = new CalculadoraJNI();

        int num1 = Integer.parseInt(args[0]);
        int num2 = Integer.parseInt(args[1]);

        int resultado = calc.calcula(num1, num2);
        System.out.println("A soma é: " + resultado);
    }
}

After constructing the classes, I executed the following sequence of commands:

javac CalculadoraJNI.java
javac TesteCaculadoraJNI.java
javah CalculadoraJNI

File generated by the javah commander JNI

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

    #ifndef _Included_CalculadoraJNI
    #define _Included_CalculadoraJNI
    #ifdef __cplusplus
    extern "C" {
    #endif
    /*
     * Class:     CalculadoraJNI
     * Method:    calcula
     * Signature: (II)I
     */
    JNIEXPORT jint JNICALL Java_CalculadoraJNI_calcula
      (JNIEnv *, jobject, jint, jint);

    #ifdef __cplusplus
    }
    #endif
    #endif

File calculaJNI.c :

#include <stdio.h>
#include "CalculadoraJNI.h"

/*
* Método que executa a soma
*/
int calcula (int num1, int num2) {
    int resultado = num1 + num2;
    return resultado;
}

/*
* Método com a mesma assinatura do calculadoraJNI.h
*/
JNIEXPORT jint JNICALL Java_CalculadoraJNI_calcula
        (JNIEnv * env, jobject jobj, jint num1, jint num2)
{
    return calcula (num1, num2);
}

Compiling the "C" code:

gcc -o libcalcula.so -shared -I/usr/lib/jvm/java-7-openjdk-amd64/include calculaJNI.c -fPIC

Error generated while trying to run:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no calcula in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886)
    at java.lang.Runtime.loadLibrary0(Runtime.java:849)
    at java.lang.System.loadLibrary(System.java:1088)
    at CalculadoraJNI.<clinit>(CalculadoraJNI.java:5)
    at TesteCalculadoraJNI.main(TesteCalculadoraJNI.java:3)