Error in creating Web service client using WSAS

[sajeevi bangamuwage]

Hi All,

i'm new to WSAS and i am doing what the documentation says(i'm using Eclips).
According to that I created this Web service

  
public class MyName {
public String getName()
{
return "sajeevi";
}
}  

when i try the WSDL url in the Try it tool it gives me the correct output. i.e the Web service is working properly.

and i create the Client.
so This is my main method

 
public static void main(String args[])
{
MyNameStub stub;
try {
stub = new MyNameStub();
MyNameStub.GetNameResponse res = stub.getName();
System.out.println("hi");
System.out.println("My Name :" + res.get_return());
 
} catch (AxisFault e1) {
e1.printStackTrace();
} catch (RemoteException e2) {
e2.printStackTrace();
}
}
   

when i run this i get the following error

org.apache.axis2.AxisFault: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

What can i do for solve this problem. please help me to solve it. I'm struck here.i can't proceed.

Thank you,
regards,
Sajeevi.