If you go to the site http://www.onjava.com/pub/a/onjava/excerpt/java_xml_2_ch2/index.html, you can find examples on how to catch server exceptions.

Here's an example:

response = call.invoke(url, "");

if (!response.generatedFault( )) {
  System.out.println("Successful execution");
} else {
  Fault fault = response.getFault( );
  System.out.println("Error encountered: " + fault.getFaultString( ));
}
 

Idar