Hello,
I am trying to use the geotools2.2 library to compute distance between
two points within a servlet (I am working on a SVG-XUL GIS
web-application that interacts with a bunch of servlets for data
manipulation)
I have first tried to use the library in a simple java application and
it worked fine
now, when I put the piece of code into my doGet method in my servlet, I
get the following error message which apparently comes from the creation
of the DefaultGeographicCRS object
Here is the ERROR MESSAGE :
6 sept. 2006 15:53:11 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: "Servlet.service()" pour la servlet Distance a généré une exception
java.lang.NoSuchFieldError: RADIAN
at
org.geotools.referencing.AbstractIdentifiedObject.ensureAngularUnit(AbstractIdentifiedObject.java:1034)
at
org.geotools.referencing.datum.DefaultPrimeMeridian.<init>(DefaultPrimeMeridian.java:124)
at
org.geotools.referencing.datum.DefaultPrimeMeridian.<init>(DefaultPrimeMeridian.java:108)
at
org.geotools.referencing.datum.DefaultPrimeMeridian.<clinit>(DefaultPrimeMeridian.java:61)
at
org.geotools.referencing.datum.DefaultGeodeticDatum.<clinit>(DefaultGeodeticDatum.java:85)
at
org.geotools.referencing.crs.DefaultGeographicCRS.<clinit>(DefaultGeographicCRS.java:95)
at com.helmet.gis.DistanceServlet.doGet(DistanceServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Here is MY CODE :
/**
*
*/
package com.helmet.gis;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.opengis.referencing.operation.TransformException;
import com.vividsolutions.jts.geom.Coordinate;
/**
* @author Vincent Laugier
*
*/
public class DistanceServlet extends HttpServlet implements Servlet {
protected void doGet(HttpServletRequest req, HttpServletResponse
res) throws ServletException, IOException {
// create 2 points
Coordinate coord1 = new Coordinate(4.47, 51.92);
Coordinate coord2 = new Coordinate(4.86, 52.38);
// create a WGS CRS
DefaultGeographicCRS crs = new
DefaultGeographicCRS(DefaultGeographicCRS.WGS84);
// compute distance
try{
double distance = JTS.orthodromicDistance(coord1,coord2,crs);
PrintWriter writer = res.getWriter();
writer.println("la distance est de : " + distance); }
catch (TransformException e) {System.err.println(e);}
}
}
Thanks in advance for your help
Vincent
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