Lastly I have a working solution.

I'm still not sure of it's correctness...

If some guru have the time to points me any amelioration, I would
appreciate (both for pure C part, and manipulation of values).

I apologize if this is of topic.

Thanks in advance,
Matthieu Dubuget

value short_p_to_val(char const  * i)
{
    value v;  
    short k = * i ;

    v= Val_int((short) *((short *) i) );
    return v ;
}

value f(char const * l)
{
  CAMLparam0() ;
  CAMLlocal1(v);

  v=alloc_array(&short_p_to_val,(char const * * ) l) ;

  CAMLreturn(v);
}

value java_short_array_array_to_ocaml_int_array_array
    (JNIEnv * env, jobject obj , jobjectArray jcscanA) {
 
    CAMLparam0 ();
    CAMLlocal1(v);

    //One element (line) of the jcscanA array
    jobjectArray ligne ;

    //bodies for each lines of the jcscanA pointer
    jshort * * ligne_body = NULL ;
    
    int i, j;  

    // The C array in wich I'll put the values of jcscanA
    // Must do that because we need a null ended array for alloc_array
    short * * * cscan ;

    jsize lignes,colonnes;

    // Allocation de cscan et ligne_body
    lignes = (*env) -> GetArrayLength(env,jcscanA) ;
    cscan = malloc((lignes+1) * sizeof(short * *));
    ligne_body = malloc (lignes * sizeof(jshort *));

    // Again : cscan is NULL ended
    cscan[lignes]=NULL;

    // Remplissage avec les valeurs de jcscanA
    for (i=0;i<lignes;i++){
	
	ligne = (*env)->GetObjectArrayElement(env,jcscanA,i);
	colonnes = (*env) -> GetArrayLength(env,ligne);
	ligne_body[i] = (*env)->GetShortArrayElements(env,ligne,0);
	cscan[i] = malloc( (colonnes+1) * sizeof(short *) );
	cscan[i][colonnes] = NULL ;
	for(j=0;j<colonnes;j++)
	    cscan[i][j] =  &(ligne_body[i][j]) ;
    }
    
    v = alloc_array(&f, (char const * *) cscan) ;

    for(i=0;i<lignes;i++){
	(*env)->ReleaseShortArrayElements(env,ligne,ligne_body[i],0);
	free(cscan[i]);    
    }
    free(ligne_body);
    free(cscan);

    CAMLreturn (v) ;
};
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