Could you please point me out where can I make such a transformation:
Convert WGS84 (EPSG::4326) coordinate to Google Map coordinate system (EPSG::3785), and vice versa.
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with the help of http://docs.geotools.org/latest/userguide/library/api/jts.html I was able to do needed convertation.
Have you tried the CRS tutorial at http://docs.geotools.org/stable/userguide/examples/crslab.html?