[flexcoders] WebServices with oc4j server

[vijaya_beera78]

Hi
   I have generated a WebService using oc4j server(Jdeveloper). I am 
trying to invoke that service from flex using <mx:webservice> tag.
But it doesn't invoke the service at all.

  here is the code 

   <mx:WebService id="serviceID" 
wsdl="http://localhost:8889/DepartmentServices/DeptServiceSoapHttpPor
t?wsdl" service="DeptService" port="DeptServiceSoapHttpPort">
        <mx:operation name="findDepartmentByDeptno" >
                <mx:request>
                        <result>30</result>
                        <!-- parameters -->
                </mx:request>
        </mx:operation>
</mx:WebService>
         <mx:Panel title="WebService Example" height="75%" 
width="75%" 
        paddingTop="10" paddingBottom="10" paddingLeft="10" 
paddingRight="10">


<mx:Label width="100%"  color="blue"
            text="Enter Department No to obtain Department Name:"/>
 <mx:TextInput id="DName" />
 <mx:Button label="Get Dept" 
click="serviceID.findDepartmentByDeptno.send()"/>
<mx:Text htmlText="Current Dept: 
{serviceID.findDepartmentByDeptno.result}"/>

</mx:Panel>
</mx:Application>

When I try to run this example , nothing happens at all.Can anyone 
guide me about how to go on with this example.

Thanks in advance.