JSNI - Managing arrays in native method

Hi, I'm having a JS exception saying "null" when running the following
code:

//Java Code
bingMap.addPolyline(locationsArray);

//JSNI Code
public native void addPolyline(Location[] locations)/*-{
for (var i = 0; i < locations.length; i++){
alert(locations[i]);
}
}-*/

Is an extra processing required when managing arrays passed by
parameter to a native method?
Thanks in advance!

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