Imlementing Simple Webservice using AXIS

Question

Hi,
I am trying to implement simple webservice using APACHE AXIS.
I have imported all the required jar files.
Even my client code compiles without any error.
But when I am trying to execute the code, it gives NULL POINTER EXCEPTION. The exception is caused by statement
Service service=new Service();
where Service is a class imported from org.apache.axis.client.Service
Please guide me how to avoid this exception and make my program run properly.
Thanks
Ashutosh.

Answer 1

hi ashutosh,
according to me null pointer exception is displayed because the service you are trying to call is not identified by your client.
this happens if your endpoint is not properly mentioned.
try to save the service as .jws and keep it in axis directory.after that ,use your client to call the service.
mention endpoint, service method name. use invoke method to call the service.
//use the following import statements:
<%@ page import="org.apache.axis.client.Call" %>
<%@ page import="org.apache.axis.client.Service" %>
<%@ page import="javax.xml.namespace.QName" %>
<%@ page import="java.net.*" %>
//set target
String endpoint = "http://localhost:9000/axis/test.jws
call.setTargetEndpointAddress(new URL(endpoint));
//set operation name
QName qname;
qname = new QName("getString");
call.setOperationName(qname);
//invoke the service
out.println(call.invoke(new Object[]{}))
if you have to pass parameters then mention them as
out.println(call.invoke(new Object[]{String s1,....}))
among the jar files you should have:
activation.jar,axis.jar,jaxrpc.jar,saaj.jar,servlet.jar,wsdl4j-1.5.1.jar,xercesImpl.jar,xmlParserApis.jar and the all the tomcat lib jar files in tomcat/common/lib directory
call your service from browser using your client as:
http://localhost:9000/ServiceClient.jsp
IF YOU WANT TO SEE THE WSDL OF THE SERVICE:
http://localhost:9000/axis/EchoHeaders.jws?method=xyz