hi frnds i want to return an integer array fron c prog to java how do i

proceed with it .....i tried with some code but is is not
working......please tell me wat to do and where i m  wrong
my code is
class IntArray {
    private native int[] sumArray(int[] arr);
    public static void main(String[] args) {
        IntArray p = new IntArray();
        int arr[] = new int[10];
        int newarr[]=new int[10];
        System.out.println("previous values of newarr");
        for(int j=0;j<10;j++)
            {arr[j]=j;
             System.out.println(arr[j]);
             }
        newarr=p.sumArray(arr);

        //for (int i = 0; i < 10; i++)
          // {
            //arr[i] = i;
            //}
       // int sum = p.sumArray(arr,newarr);
        System.out.println("new values of newarr");
        try{for(int j=0;j<10;j++)
                 System.out.println(newarr[j]);
             }
         catch(NullPointerException np){}
       System.out.println("value of sum");
       // System.out.println("sum = " + sum);
    }
    static {
        System.loadLibrary("IntArray");
    }

}

#include<stdio.h>
#include<jni.h>
#include"IntArray.h"
JNIEXPORT jintArray JNICALL Java_IntArray_sumArray
 (JNIEnv *env, jobject obj, jintArray arr)
{
    jint buf[10];
    jint i, sum = 0;
    (*env)->GetIntArrayRegion(env, arr, 0, 10, buf);
    for (i = 0; i < 10; i++) {
        buf[i]= buf[i]+2;
                printf("%d",buf[i]);
    }
    return buf;
}

it is printing the values in c program but it is not retuning the
newarr