problem in deploying a web service

I want to deploy a service. I executed the following operations:

- deploying with Apache SOAP using a deployment descriptor file named WebService:

<isd:service 
   xmlns:isd="http://xml.apache.org/xml-soap/deployment"
   id="urn:CompService">
   
   <isd:provider type="java"
         scope="Application"
         methods="getComp">
     <isd:java class="tesi.application_controller"
         static="false"/>
   </isd:provider>
   <isd:faultListener>
   org.apache.soap.server.DOMFaultListener
   </isd:faultListener>
   <isd:mappings>
   </isd:mappings>    
</isd:service>

- invoking the getCount method using this java file named GetCompApp

package tesi;
import java.net.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;
public class GetCompApp {
   public static void main(String[] args) 
      throws Exception {
      
      URL url = 
        new URL(
          "http://localhost:8080/soap/servlet/rpcrouter");
    
      Call call = new Call();
      call.setTargetObjectURI("urn:CompService");
      call.setMethodName("getComp");
      try {
         Response resp = call.invoke(url, "");
         Parameter ret = resp.getReturnValue();
         Object value = ret.getValue();
         System.out.println("Result is " + value);
      }
      catch (SOAPException e) {
         System.err.println("Caught SOAPException (" +
                         e.getFaultCode() + "): " +
                         e.getMessage());
      }
   }
}

but I received this exception:

Caught SOAPException (SOAP-ENV:Protocol): Unsupported response content type &quo
t;text/html; charset=ISO-8859-1&quot;, must be: &quot;text/xml&quot;. Response w
as:
&lt;html&gt;&lt;head&gt;&lt;title&gt;Apache Tomcat/4.1.30 - Error report&lt;/tit
le&gt;&lt;STYLE&gt;&lt;!--H1{font-family : sans-serif,Arial,Tahoma;color : white
;background-color : #0086b2;} H3{font-family : sans-serif,Arial,Tahoma;color : w
hite;background-color : #0086b2;} BODY{font-family : sans-serif,Arial,Tahoma;col
or : black;background-color : white;} B{color : white;background-color : #0086b2
;} HR{color : #0086b2;} --&gt;&lt;/STYLE&gt; &lt;/head&gt;&lt;body&gt;&lt;h1&gt;
HTTP Status 500 - &lt;/h1&gt;&lt;HR size=&quot;1&quot; noshade&gt;&lt;p&gt;&lt;b
&gt;type&lt;/b&gt; Exception report&lt;/p&gt;&lt;p&gt;&lt;b&gt;message&lt;/b&gt;
 &lt;u&gt;&lt;/u&gt;&lt;/p&gt;&lt;p&gt;&lt;b&gt;description&lt;/b&gt; &lt;u&gt;T
he server encountered an internal error () that prevented it from fulfilling thi
s request.&lt;/u&gt;&lt;/p&gt;&lt;p&gt;&lt;b&gt;exception&lt;/b&gt; &lt;pre&gt;j
avax.servlet.ServletException: Error building response envelope: java.lang.NullP
ointerException
        at org.apache.soap.server.http.RPCRouterServlet.doPost(RPCRouterServlet.
java:418)
        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)
&lt;/pre&gt;&lt;/p&gt;&lt;HR size=&quot;1&quot; noshade&gt;&lt;h3&gt;Apache Tomc
at/4.1.30&lt;/h3&gt;&lt;/body&gt;&lt;/html&gt;

HOW CAN I RESOLVE THE PROBLEM????
 
 
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