method not founded

I have written this client:
import java.net.*;
import java.util.*;
import java.io.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;
public class Client {
   public static void main(String[] args) 
      throws Exception {
      String c_Nomefile="";
      String [] lista = new File(".").list();                          //crea lista
      URL url = 
        new URL(
          "http://localhost:8080/soap/servlet/rpcrouter");
      System.out.println("ELENCO SERVIZI:");
      for(int cx=0; cx<lista.length; cx++)
         if ( new File(lista[cx]).isFile() )                           //verifica se è file
            if ( lista[cx].toLowerCase().lastIndexOf(".owl") >= 0)     //e con estensione .owl
               System.out.println((" * "+lista[cx]+"       ").substring(0,20));
           System.out.print("Servizio principale: ");
           BufferedReader in1= new BufferedReader(new InputStreamReader(System.in));
           String c_Nomefile1 = in1.readLine();
           System.out.print("Servizio da comporre: ");
           BufferedReader in2= new BufferedReader(new InputStreamReader(System.in));
           String c_Nomefile2 = in2.readLine();
           c_Nomefile = c_Nomefile1 + c_Nomefile2;      
      Call call = new Call();
      call.setTargetObjectURI("urn:Composizione");
      call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
      Vector params = new Vector();
      params.addElement(new Parameter("file1", String.class, c_Nomefile1, null));
      params.addElement(new Parameter("file2", String.class, c_Nomefile2, null));
      call.setParams(params);
          
     try {
  call.setMethodName("metodi_xml");
         Response resp = call.invoke(url, "");
         if (resp.generatedFault()) {
             Fault fault = resp.getFault();
             System.err.println("Generated fault: " + fault);
         } else {
             Parameter ret = resp.getReturnValue();
             Object value = ret.getValue();   
             System.out.println("comp " + value);
         }
      }
     catch (SOAPException e) {
         System.err.println("Caught SOAPException (" +
                         e.getFaultCode() + "): " +
                         e.getMessage());
     }
   }
}

The service is:
public class servizio {
     public int metodi_xml(String file1, String file2) {
     int a;
     a=0;
     return a;
   }
}

The .dd file is:
<isd:service 
   xmlns:isd="http://xml.apache.org/xml-soap/deployment"
   id="urn:Composizione">
   
   <isd:provider type="java"
         scope="Application"
         methods="metodi_xml">
     <isd:java class="servizio"
         static="false"/>
   </isd:provider>
   <isd:faultListener>org.apache.soap.server.DOMFaultListener</isd:faultListener>
   <isd:mappings>
   </isd:mappings>    
</isd:service>

All this file are in:%CATALINA_HOME%\webapps\soap\WEB-INF\classes; when I try java Client, I receive this exception:

Generated fault: [Attributes={}] [faultCode=SOAP-ENV:Server] [faultString=Except
ion while handling service request: servizio.metodi_xml(java.lang.String,java.la
ng.String) -- no signature match] [faultActorURI=/soap/servlet/rpcrouter] [Detai
lEntries=
[(0)=<stackTrace>java.lang.NoSuchMethodException: servizio.metodi_xml(java.lang.
String,java.lang.String) -- no signature match
        at org.apache.soap.util.MethodUtils.getEntryPoint(MethodUtils.java:194)
        at org.apache.soap.util.MethodUtils.getMethod(MethodUtils.java:548)
        at org.apache.soap.util.MethodUtils.getMethod(MethodUtils.java:528)
        at org.apache.soap.server.RPCRouter.invoke(RPCRouter.java:114)
        at org.apache.soap.providers.RPCJavaProvider.invoke(RPCJavaProvider.java
:129)
        at org.apache.soap.server.http.RPCRouterServlet.doPost(RPCRouterServlet.
java:354)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2422)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:180)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:171)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:163)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:174)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:19
9)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:828)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:700)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:584)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:683)
        at java.lang.Thread.run(Thread.java:534)
</stackTrace>]
] [FaultEntries=]

C:\Programmi\jakarta-tomcat-4.1.30\webapps\soap\WEB-INF\classes>java Client
ELENCO SERVIZI:
 * prova2.owl
 * prova1.owl
Servizio principale: prova1
Servizio da comporre: prova2
Generated fault: [Attributes={}] [faultCode=SOAP-ENV:Server] [faultString=Except
ion while handling service request: servizio.metodi_xml(java.lang.String,java.la
ng.String) -- no signature match] [faultActorURI=/soap/servlet/rpcrouter] [Detai
lEntries=
[(0)=<stackTrace>java.lang.NoSuchMethodException: servizio.metodi_xml(java.lang.
String,java.lang.String) -- no signature match
        at org.apache.soap.util.MethodUtils.getEntryPoint(MethodUtils.java:194)
        at org.apache.soap.util.MethodUtils.getMethod(MethodUtils.java:548)
        at org.apache.soap.util.MethodUtils.getMethod(MethodUtils.java:528)
        at org.apache.soap.server.RPCRouter.invoke(RPCRouter.java:114)
        at org.apache.soap.providers.RPCJavaProvider.invoke(RPCJavaProvider.java
:129)
        at org.apache.soap.server.http.RPCRouterServlet.doPost(RPCRouterServlet.
java:354)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2422)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:180)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:171)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:163)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:174)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

        at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:19
9)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:828)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:700)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:584)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:683)
        at java.lang.Thread.run(Thread.java:534)
</stackTrace>]
] [FaultEntries=]

WHY? 


 
 
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