changement de referenciel

Bonjour j' arrive pas à passer de CRS:83 à EPSG:2154 alors que le code est bien fais je pense ??
j' ai besoin d'aide merci de votre comprehension

Code:

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import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
 
import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
 
/**
 * User: san
 * Date: 23/06/12
 * Time: 6:09 PM
 */
public class ConvertRef {
 
 
    public static void main(String[] args) throws FactoryException, TransformException {
        GeometryFactory gf = new GeometryFactory();
        Coordinate c = new Coordinate(175784.99999999997, 5842215.0);
 
        Point p = gf.createPoint(c);
        CoordinateReferenceSystem crs2 = CRS.decode("EPSG:3395");
        CoordinateReferenceSystem utmCrs = CRS.decode("EPSG:2154");
        CoordinateReferenceSystem utmCrs1 = CRS.decode("CRS:83");
        MathTransform mathTransform = CRS.findMathTransform(utmCrs,utmCrs1 , true);
        Point p1 = (Point) JTS.transform(p, mathTransform);
 
        System.out.println(p1.getCoordinate());
        CoordinateReferenceSystem utmCrs2 = CRS.decode("CRS:83");
        MathTransform mathTransform2 = CRS.findMathTransform(utmCrs1,utmCrs,true);
 
        Point p2 = (Point) JTS.transform(gf.createPoint(p1.getCoordinate()), mathTransform2);
 
        System.out.println(p2.getCoordinate());
    }
}

en compilant j’obtiens ceci :

Citation:

Exception in thread "main" org.opengis.referencing.NoSuchAuthorityCodeException: L'autorité "EPSG" n'est pas connue. Le fichier JAR qui la définie n'est peut-être pas accessible?
at org.geotools.referencing.CRS.decode(CRS.java:396)
at ChngementREF.TestReproject.main(TestReproject.java:28)