Javax.xml.rpc.ServiceException: java.lang.NullPointerException

Question

Hello! Can somebody help me? I tried to call web service? usimg DII Client. Here is the code:
String[] res = null;
String nmsp = "urn:foo";//targetNamespace in WSDL
String qnameService = "ServiceName";
String qnamePort = "PortName";//<port name in WSDL
String urlst = "service?wsdl";
try {
URL url = new URL(urlst);
ServiceFactory factory = ServiceFactory.newInstance();
javax.xml.rpc.Service serv = null;
QName qName = null;
try {
qName = new QName(nmsp,qnameService);
if (qName != null) {
serv = factory.createService(url, qName);
} else {
System.out.println("qName = null" );
} catch (Exception ex) {
System.out.println("qnameService = " + qnameService);
ex.printStackTrace();
Call call = serv.createCall(new QName(nmsp, qnamePort), new QName(nmsp, "whatListsCat "));
res = ((String[]) call.invoke(new Object[]{}));
for (int i = 0; i < res.length; i++)
System.out.println("res = " + res);
} catch (Exception e) {
e.printStackTrace();
return res;
And I have the Error in this place: serv = factory.createService(url, qName);
Error is: javax.xml.rpc.ServiceException: java.lang.NullPointerException
Maybe somebody knows what is the problem?
Thank you!

Answer 1

Hi Eric! I realy don't know what's wrong. I have tried to call web-service with XML Spy. When I called it first time everything was
fine, it worked. But when I tried to invoke it once again and again I had this
error: "HTTP error: could not POST file
'/axis/services/VocabServerApi' on server '192.171.196.92'(500)". Here is the link to the wsdl file: http://vocab.ndg.nerc.ac.uk/VocabServerAPI.wsdl . Thank you for your help.
Regards,
Kristina