[Geotools-gt2-users] instantiate DefaultGeographicCRS in a servlet

[vincent l. <vin...@gm...>]

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