findHomography function of OpenCV 3.0 RC1 in Java is not working -

i want calculate homography of images using opencv in java, throws exception: opencv error: bad argument (the input arrays should 2d or 3d point sets) in cv::findhomography

my code (because code long posted part of code):

    ....     list<point> obj = new arraylist<>();     list<point> scene = new arraylist<>();      keypoint[] _keypoints_object = keypoints_object.toarray();     keypoint[] _keypoints_scene = keypoints_scene.toarray();      (int = 0; < good_matches.size(); i++) {         obj.add(_keypoints_object[good_matches.get(i).queryidx].pt);         scene.add(_keypoints_scene[good_matches.get(i).trainidx].pt);     }      matofpoint2f _obj = new matofpoint2f();     _obj.fromlist(obj);     matofpoint2f _scene = new matofpoint2f();     _scene.fromlist(scene);      **mat h = calib3d.findhomography(_obj, _scene, calib3d.ransac, 3);**     .... 

no error during compiling, have declared 2d point matofpoint2f , compiler accepted, when run code throws exception. reason, opencv bug or code has problem?

if knows please tell me how solve. in advance!

if (obj.isempty() || scene.isempty()) {         logger.debug("no matches found @ all.....");      } 

the list of obj or scene empty. try avoid findhomography when list empty.