자바 geotools 15.1 좌표간 거리계산

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import org.geotools.geometry.jts.JTS; import org.geotools.referencing.CRS; import org.geotools.referencing.GeodeticCalculator; import org.opengis.referencing.crs.CoordinateReferenceSystem;   import com.vividsolutions.jts.geom.Coordinate;   public class GeoDistanceTest {    private CoordinateReferenceSystem sourceCRS;  private String sourceX;  private String sourceY;     public GeoDistanceTest(String sourceCRS, String sourceX, String sourceY) throws Exception {   this.sourceCRS = CRS.decode(sourceCRS);   this.sourceX = sourceX;   this.sourceY = sourceY;      }     public void distanceCalculator(String x, String y) throws Exception {       GeodeticCalculator gc = new GeodeticCalculator(sourceCRS);       gc.setStartingPosition(JTS.toDirectPosition(new Coordinate(Double.parseDouble(sourceX), Double.parseDouble(sourceY)),sourceCRS));   gc.setDestinationPosition(JTS.toDirectPosition(new Coordinate(Double.parseDouble(x), Double.parseDouble(y)),sourceCRS));       double distance = gc.getOrthodromicDistance();       System.out.println("distance (m) : "+ distance);  }     public static void main(String[] args) throws Exception {       GeoDistanceTest g = new GeoDistanceTest("EPSG:4326", "37.5639686", "126.9794393");     g.distanceCalculator("37.5639686", "126.9794393");         }   }