how to invoke a webservice

Hi,
I need to know what needs to be done to invoke a web service? In other words what are the basics for writing a web service client?
Thanks
Ajay

Only few things,

Download Apache Axis

Read the documentation on using the pretty-tiny tool WSDL2Java

Its a tool which will automatically create the necessary java files (stubs)to for a given webservice(WSDL)

compile the java files, you can also import the necessary class to your application

run it.

Thanks Balaji,
Actually I need to do it without any tool.
I've to use SOAP API. I think I can do it using Call().
Can u tell me what I need to specify in Call.setTargetObjectURI()? is it the Web service name or some other identifier?
Ajay

Iam getting the following fault when i run my client : -
faultcode :soap:Client
faultString :Server did not recognize the value of HTTP Header SOAPAction:
my code is : -
Call call = new org.apache.soap.rpc.Call();
URL url = new URL("http://delgtel304:7070/WebService2/JavaService1.asmx");
call.setTargetObjectURI"http://delgtel304:7070/WebService2/JavaService1.asmx");
call.setMethodName("JavaTest");
call.setEncodingStyleURI(org.apache.soap.Constants.NS_URI_SOAP_ENC);
Vector vParam = new Vector();
vParam.addElement(new org.apache.soap.rpc.Parameter"str",String.class,"Ajay",null));
call.setParams(vParam);
org.apache.soap.rpc.Response resp = call.invoke(url, "");

if(resp.generatedFault()){
org.apache.soap.Fault fault = resp.getFault();
System.out.println("faultcode :"+fault.getFaultCode());
System.out.println("faultString :"+fault.getFaultString());
}
else{
org.apache.soap.rpc.Parameter result = resp.getReturnValue();
System.out.println(result.getValue());
}
any help is greatly appreciated.
Thanks

Apparently your code is not setting the SOAP-Action header. You can do it with

[ March 10, 2004: Message edited by: Lasse Koskela ]

Originally posted by Balaji Loganathan:
Read the documentation on using the pretty-tiny tool WSDL2Java

How to get WSDL2Java to work though... Whenever I try I get an error

C:\work\Java\SOAP\zip>java -cp %AXISCP% org.apache.axis.wsdl.WSDL2Java ZipServic
e.wsdl
Exception in thread "main" java.lang.NoClassDefFoundError: javax.wsdl.Definition
at org.apache.axis.wsdl.toJava.JavaGeneratorFactory.class$(JavaGeneratorFactory.java:163)
at org.apache.axis.wsdl.toJava.JavaGeneratorFactory.addDefinitionGenerators(JavaGeneratorFactory.java:163)
at org.apache.axis.wsdl.toJava.JavaGeneratorFactory.addGenerators JavaGeneratorFactory.java:133)
at org.apache.axis.wsdl.toJava.JavaGeneratorFactory.<init> JavaGeneratorFactory.java:120)
at org.apache.axis.wsdl.toJava.Emitter.<init>(Emitter.java:120)
at org.apache.axis.wsdl.WSDL2Java.createParser(WSDL2Java.java:172)
at org.apache.axis.wsdl.gen.WSDL2.<init>(WSDL2.java:113)
at org.apache.axis.wsdl.WSDL2Java.<init>(WSDL2Java.java:161)
at org.apache.axis.wsdl.WSDL2Java.main(WSDL2Java.java:289)

AXISCP is

AXISCP=c:\tools\axis-1_1\lib\axis.jar;c:\tools\axis-1_1\lib\commons-discovery.jar;c:\tools\axis-1_1\lib\commons-logging.jar;c:\tools\axis-1_1\lib\log4j-1.2.8.jar;c:\tools\axis-1_1\lib\jaxrpc.jar;c:\tools\axis-1_1\lib\saaj.jar

added some linebreaks to keep it readable

other than that the classpath is empty so no conflicting libraries.
Using J2SDK 1.4.2-b28 (I know Axis has trouble with 1.4 JDKs, but I suppose there must be a workaround?)

You need the wsdl4j.jar in your classpath as well (if I remember correctly, that's where the javax.wsdl package is defined).

cheers. Sometimes you just don't see your own mistakes however long you stare at them

Hi All,
Thanks for all those reply's.
But my problem still remains but now in a different form.
I modified the code as: -
System.setProperty("javax.xml.soap.MessageFactory","weblogic.webservice.core.soap.MessageFactoryImpl");
System.setProperty( "javax.xml.rpc.ServiceFactory","weblogic.webservice.core.rpc.ServiceFactoryImpl");
ServiceFactory factory = ServiceFactory.newInstance();
String targetNamespace = "http://tempuri.org/";
QName serviceName = new QName(targetNamespace,"JavaService1");
QName portName = new QName(targetNamespace,"JavaService1Soap");
QName operationName = new QName("http://schemas.xmlsoap.org/soap/http","JavaTest");
URL wsdlLocation = new URL("http://delgtel304:7070/WebService2/JavaService1.asmx?WSDL");
Service service = factory.createService(wsdlLocation, serviceName);
Call call = service.createCall(portName, operationName);
call.setProperty(javax.xml.rpc.Call.SOAPACTION_USE_PROPERTY, new Boolean(true));
call.setProperty(javax.xml.rpc.Call.SOAPACTION_URI_PROPERTY, "MySoapAction");
String result = (String) call.invoke(new Object[] {"BEAS"});
System.out.println("\n");
System.out.println("This example shows how to create a dynamic client application that invokes a non-WebLogic Web service.");
System.out.println("The webservice used was:http://services.xmethods.net/soap/urn:xmethods-delayed-quotes.wsdl");
System.out.println("The quote for BEAS is: ");
System.out.println(result);

I get this on console :-
WARNINIG: Unable to find a javaType for the xmlType:['http://tempuri.org/']:Java
Test. Make sure that you have registered this xml type in the type mapping
Using SOAPElement instead
WARNINIG: Unable to find a javaType for the xmlType:['http://tempuri.org/']:Java
TestResponse. Make sure that you have registered this xml type in the type mappi
ng
Using SOAPElement instead
Exception in thread "main" javax.xml.rpc.JAXRPCException: failed to invoke opera
tion. Error in the soap layer (jaxm); nested exception is: Message[ failed to se
rialize xml:weblogic.xml.schema.binding.SerializationException: mapping lookup f
ailure. class=interface javax.xml.soap.SOAPElement class context=TypedClassConte
xt{schemaType=['http://tempuri.org/']:JavaTest}]StackTrace[
javax.xml.soap.SOAPException: failed to serialize xml:weblogic.xml.schema.bindi
ng.SerializationException: mapping lookup failure. class=interface javax.xml.soa
p.SOAPElement class context=TypedClassContext{schemaType=['http://tempuri.org/']
:JavaTest}
at weblogic.webservice.core.DefaultPart.toXML(DefaultPart.java:266)
at weblogic.webservice.core.DefaultMessage.toXML(DefaultMessage.java:456
)
at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.jav
a:407)
at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.jav
a:363)
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:423)
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:292)
at TestClient2.main(TestClient2.java:35)
Caused by: weblogic.xml.schema.binding.SerializationException: mapping lookup fa
ilure. class=interface javax.xml.soap.SOAPElement class context=TypedClassContex
t{schemaType=['http://tempuri.org/']:JavaTest}
at weblogic.xml.schema.binding.RuntimeUtils.lookup_serializer(RuntimeUti
ls.java:144)
at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUti
ls.java:180)
at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUti
ls.java:167)
at weblogic.webservice.core.DefaultPart.toXML(DefaultPart.java:258)
... 6 more
]
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:432)
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:292)
at TestClient2.main(TestClient2.java:35)
Thanks
Ajay

Did anybody solve this problem?. I am getting a similar error in Weblogic 8.1, when trying to invoke a web service with JAX-RPC (dynamic wsdl method).

Hi,

I am also having similar problem when trying to connect to a WS using Axis client.

Can somebody tell me what should be the value for
? I tried setting it to blank and some other value but I get this error regardless. What is the significance of this property?

Thanks