Help for servlet!

Thank for previous help!
Now I have a most specific problem....so, i use tomcat 5.5,cocoon 2.1 and xindice 1.1b4. 
I want make a servlet for update database. After the correction of PartsXupdate.java, i had made this servlet:


import org.xmldb.api.base.*;
import org.xmldb.api.modules.*;
import org.xmldb.api.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.w3c.dom.*;
import org.apache.xindice.client.xmldb.DatabaseImpl;
import org.apache.xindice.client.xmldb.services.*;

public class PartsXupdate extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {

	Collection col = null;
	PrintWriter out = response.getWriter();

	try {
        
	String driver = "org.apache.xindice.client.xmldb.DatabaseImpl";
	Class c = Class.forName(driver);
         
        Database database = (Database) c.newInstance();
        DatabaseManager.registerDatabase(database);
         
        col = DatabaseManager.getCollection("xmldb:xindice://localhost:8080/db/test");
         
	String xupd = "<xupdate:modifications version=\"1.0\" xmlns:xupdate=\"http://www.xmldb.org/xupdate\">"  + 
	"<xupdate:insert-after select=\"/scheda/info\">"  +
	"<xupdate:element name=\"commento\">Bel libro!</xupdate:element>"  + 
	"</xupdate:insert-after>"  + 
	"</xupdate:modifications>"; 

	String nome = "4.xml";   

        /* We are using XUpdateQueryService */
        XUpdateQueryService service =
        (XUpdateQueryService) col.getService("XUpdateQueryService", "1.0");
               
        service.updateResource(nome, xupd);
  	}
      
	catch(Exception e) {
                out.write("Error " + e.getMessage());
            }

/*
	catch (XMLDBException e) {
        System.err.println("XML:DB Exception occurred " + e.errorCode);
        }
*/      

	finally {
    	}
}
}


The error message is:

org.apache.xindice.client.xmldb.DatabaseImpl

Where is the problem? I post my classpath:

C:\xindice-1.1b4\xindice-1.1b4.jar;
C:\xindice-1.1b4\lib\commons-logging-1.0.3.jar;
C:\xindice-1.1b4\lib\servlet-2.3.jar;
C:\xindice-1.1b4\lib\xalan-2.5.2.jar;
C:\xindice-1.1b4\lib\xerces-2.6.0.jar;
C:\xindice-1.1b4\lib\xml-apis.jar;
C:\xindice-1.1b4\lib\xmldb-api-20030701.jar;
C:\xindice-1.1b4\lib\xmldb-api-sdk-20030701.jar;
C:\xindice-1.1b4\lib\xmldb-common-20030701.jar;
C:\xindice-1.1b4\lib\xmldb-xupdate-20040205.jar;
C:\xindice-1.1b4\lib\xmlrpc-1.1.jar;
.;

Is it correct?
Thank for any help!
Bye


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