Point2D.Double latlon = new Point2D.Double();
double lon = latlon.x = 13.295053;
double lat = latlon.y = 52.499847;
Point2D.Double xy = new Point2D.Double();
proj.transform(latlon, xy);
System.out.println(xy);
proj.inverseTransform(xy, latlon);
System.out.println(latlon);
assertEquals(lon, latlon.x, 0.001);