Contract-first : WSDL vs Java interface

Hello,
I am starting to work with web Service.
Many blogs and articles suggest to write WebServices contract from a WSDL.
I am a java Programmer. I totally agree with the contract-first and the data-driven communication concept.
Here is my question: why use WSDL when you can convert any Java Interface and Bean into a WebServices?
If a tool gives you the possibility to move from xml to java (and vice-versa), why not stay with a java interface?
What are the pitfalls of using this technique (other than being too easy to change the contract)?

The main reason why you would want to write WSDL first is to be able to create a more verbose XML schema. For instance, if you take a raw Java interface or class and convert from Java to WSDL/XSD everything ends up being optional because the converters have no idea what is supposed to be required versus what isn't as well as field length restrictions etc. Some of the newer tools may allow you to do this with annotations but I haven't really looked into this.
Writing the XML schema first allows you to offload more work on the XML parser at run time because it can do the schema validation for you instead of you having to manually perform this. This also allows someone writing their own client to consume the WSDL and be able to generate a client that will do more work than one based off of Java classes (e.g. someone creating a .NET client can let the XML parser do some heavy lifting during the marshalling process before ever sending the request to your web service).

Similar Messages

Java tools or toolkit for Contract-first Web services development

hi,
I have just started on Web Services and during my internship I was encouraged to develop Contract-First web services inspite of the fact that the Java implementation is available in place. I was trying to search internet for any tools that have the facility to generate the WSDL given the XML schema in Java, but in vain.
So I have come here to the place of Java experts to guide me if there are any such tools for generation of WSDL from the xsd schema.
PS: I cannot use Code-first even though the Java implementation is already available to me even though it is more wide-spread and has tools available.
Edited by: JavaWS_newbie on Jun 4, 2008 9:46 AM

hi,
I have just started on Web Services and during my internship I was encouraged to develop Contract-First web services inspite of the fact that the Java implementation is available in place. I was trying to search internet for any tools that have the facility to generate the WSDL given the XML schema in Java, but in vain.
So I have come here to the place of Java experts to guide me if there are any such tools for generation of WSDL from the xsd schema.
PS: I cannot use Code-first even though the Java implementation is already available to me even though it is more wide-spread and has tools available.
Edited by: JavaWS_newbie on Jun 4, 2008 9:46 AM

Could not convert from java interface to interface type wsdl ??

i have a problem wheni have a problem when i develop bpel using mediator and wire to ejb service. When the mediator wire to ejb service, i found the error : Could not convert from java interface to interface type wsdl.... How to solve the problem?

I followed the case closely (with the same name of classes, methods, etc), but still get the error: “Could not convert from java interface to interface type wsdl.Exception=nl.amis.calculator.Calculator”. I created a Java class to test the lookup and function correctly. However, when I try to wire a Mediator to this Reference, I run into an Interface Conversion Error. I’ve included the line javaInterface = “nl.amis.calculator.Calculator” in file composite.xml, but still get error. Could you help me?

Converted WSDL into .java-files - and now?

I should implement a client for an existing web service. All I have is a .wsdl-file of the web service to call.
Therefore I used the eclipse's functionality to convert .wsdl into .java files, which generated some files for me, for example:
- interface XXX extending java.rmi.Remote
- interface XXXService extends javax.xml.rpc.Service
- class XXXProxy implements XXX
- class XXXServiceLocator extends org.apache.axis.client.Service
- class XXXSoapBindingStub extends org.apache.axis.client.Stub implements XXX
- class XXXRfcException extends org.apache.axis.AxisFault implements java.io.Serializable
- class XXXRfcExceptions implements java.io.Serializable
My question... what to do now? How can I get the service and call its functionality?
Your help is really, REALLY appreciated...

Hi,
Write client application like below.
public class Client{
public static void main(String [] args) throws Exception {
// Make a service
XXXService service = new XXXServiceLocator();
// Now use the service to get a stub which implements the SDI.
AddressBook port = service.getAddressBook();
// Make the actual call
Address address = new Address(...);
port.addEntry("Russell Butek", address);
Thanks&Regards,
M.Kumaraswamy.

Are Java Interfaces 'free'?

From a performance point of view, are Java interfaces free?
That is, if I have:
class Foo
public void bar() { ... // some code }
}and I change it to:
interface Foo
public void bar();
class FooImpl implements Foo
public void bar() { ... // some code }
}And I call one or other of the Foos like
Foo foo // A parameter, field or local variable.
foo.bar();Does calling foo through an interface add any overhead that calling it direct in the first example not? As I understand it, all methods are 'virtual' in Java, so it should perform the same in either case.
Thanks for any of your thoughts.
Rupert

rupertlssmith wrote:
YoungWinston wrote:
The Second Rule of Program Optimization (for experts only!): Don't do it yet.
- Michael A. Jackson
Basically, don't worry about it. Worry about writing clear, correct, object-oriented code.
Wierdly enough, in the long run, that is more likely to help than anything else you can do, should (and if) you ever need to worry about optimization in the future.
WinstonThanks for the advice. I can write good clear OO code. I am now at the future and worrying about optimization, so have made it past the second rule!Then you exactly know where your bottleneck is from the profiler you've used. Did it tell you that your interfaces are the bottleneck? If so, why do you even bother to ask here?

Java interfaces allow us to specify limited ways in which otherwise

can anyone explain "Java interfaces allow us to specify limited ways in which otherwise dissimilar classes, from completely different parts of inheritance hierarchy, resemble one another." please?
many thanks.

An interface defines a contract which an implementing class must fulfill. As long as the implementing class is written properly, then it provides a specific, advertised behavior. There are no restrictions as to which classes may implement a given interface (in the sense that there are inheritance restrictions, such as single-inheritance, no inheritance loops, and the like). Therefore, any two arbitrary classes may implement the same interface, and therefore provide the same behavior.
For example, the Iterator interface provides the ability to loop over a collection of objects in a well-defined way. Any class which implements Iterator would be manipulable in the same way, and could therefore be said to resemble each other.

Mediator To Spring Error-Could not convert from java interface to interface

Hi,
I have a requirement to using a Spring component and my composite application would be File Read -> Mediator -> Spring Component -> File Write.
I have to read a file and using mediator map the same to the Spring input and write the Spring component output to a file.
I have created a Java interface ( Package Name - transformtospring , Interface Name - TransformInterface) and also created a Java Class ( TransformImpl ) which implements the Interface in this package. Saved all these artifacts in SCA-INF/src folder of the application.
My Spring Bean configuration file is as follows ( saved the file in the same folder as composite.xml )
<?xml version="1.0" encoding="windows-1252" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:lang="http://www.springframework.org/schema/lang"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:sca="http://xmlns.oracle.com/weblogic/weblogic-sca"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/tool http://www.springframework.org/schema/tool/spring-tool-2.5.xsd http://xmlns.oracle.com/weblogic/weblogic-sca META-INF/weblogic-sca.xsd">

<bean class="transformtospring.TransformImpl" name="TransformBean"/>
<sca:service name="TransformService" target="TransformBean"
type="transformtospring.TransformImpl"/>
</beans>
I have created a Spring Context which uses the above Spring Configuration. When i tried to map the mediator output to Spring , i'm getting an error shown below.
" Could not convert from java interface to interface type wsdl . Exception=java.lang.ClassNotFoundException transformtospring.TransformImpl "
Please do let me know where exactly i'm doing wrong.
Regards,
Sri.

Hi All,
I could able to work this one out now !!!
But i'm having an issue mapping the input to this service. The method signature for the service is as follows:
public byte[] processData(byte[] input) throws Throwable{
So the input for this Service is a byte array. Now i'm mapping the data from a File Input ( Read File - opaqueElement ) to this service directly ( using mediator ).
Now when i have looked into the message in the Enterprise Manager, following is the message structure from Read File input to the service.
<message>
<properties>
<property name="tracking.compositeInstanceId" value="10009"/>
<property name="tracking.ecid" value="bcd04297e25136e7:4869a9c:13316255efc:-8000-0000000000001f79"/>
<property name="tracking.conversationId" value="TJ9PCcbtu3S0DA0GuxsGx13RYUb1NxHNndfk2PC8ukk."/>
</properties>
<parts>
<part name="parameters">
<ns0:processCollaboration>
<arg0>PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48bnMwOkFkZDJJbnB1dCAgeG1s bnM6eHNpPSdodHRwOi8vd3d3LnczLm9yZy8yMDAxL1hNTFNjaGVtYS1pbnN0YW5jZScgeG1sbnM6 bnMwPSd1ay5jby5qZHdpbGxpYW1zLkFkZDJJbnB1dCcgeHNpOnNjaGVtYUxvY2F0aW9uPSd1ay5j by5qZHdpbGxpYW1zLkFkZDJJbnB1dCByZXF1ZXN0LnhzZCcPG5zMDpudW0xPjEwPC9uczA6bnVt MT48bnMwOm51bTI+MTY8L25zMDpudW0yPjwvbnMwOkFkZDJJbnB1dD4=+</arg0>
</ns0:processCollaboration>
</part>
</parts>
</message>
and the corresponding response message ( No output ) back from the service is:
<message>
<properties>
<property name="tracking.compositeInstanceId" value="10009"/>
<property name="tracking.ecid" value="bcd04297e25136e7:4869a9c:13316255efc:-8000-0000000000001f79"/>
<property name="componentName" value="ProcessCollab"/>
<property name="tracking.conversationId" value="TJ9PCcbtu3S0DA0GuxsGx13RYUb1NxHNndfk2PC8ukk."/>
<property name="compositeDN" value="default/CollaborationToSpring!1.0*soa_a8da1da7-f98f-4935-8d20-da9e7bc003cc"/>
</properties>
<parts>
<part name="parameters">
<processCollaborationResponse>
<return/>
</processCollaborationResponse>
</part>
</parts>
</message>
I have included System.out statements in my Java class , but its not printing anything in the logs.
I'm under the impression that the underlying infrastructure ( mediator ) transparently encodes and decodes data from base64Binary to java byte array. So could anyone help me on this !!!
Regards,
Sri.

Java interface with xml communication

Hello everybody,
For a project i need to make a java interface with xml communication.
For example ; from 1 laptop I press on a java button and then i need to get a text message on the other laptop.
The java interface is already created now the xml code for communication.
I hope someone can help me how to start with the xml code.
Are there any templates that i can use?

I need to use XML for this, cause it is in the
assignment.As far as communication is concerned, it doesn't matter that you are sending XML. You can send any kind of data. So first find out how to send data, then send data which is XML.
I only want to know if its possible to send data/text
from 1 laptop (windowsxp prof) to the other laptop
(also windows xp prof).Provided the other laptop is running a server that can receive that data.
Maybe its easier if I send data to a specific IP
address?Provided there is a server running at that IP address that can receive that data. You can use an IP address to connect to a server but that has nothing to do with sending the data.
Its important that the communication between 2 system
is in XML language.XML is not a programming language. XML is a format for storing data. You can certainly send XML-formatted data between two computers.
So i hope u have a solution for my problem.The solution would be for you to learn how communication between two computers works in the real world. If you have an assignment that says you have to make communication work, surely there was something taught to you before about how to do it?

Java Interface Question.

There are classes in the Java SDK, such as the Interface:
org.w3c.dom.Document
that have factory methods in them that carry out actual operations.
But how can this be possible, because when I program an interface:
public interface test {
public void setString(String s);
It will only compile thus, with no implementation on the method signatures?
How do Java interfaces with factory methods to this?
org.w3c.dom.Node is another one. Where does the functionality/method implementation
come from?

public interface MyInterface {
     public void method1();
class MyImplementation implements MyInterface {
     public void method1(){
public class MyFactory {
     public static MyInterface createMyInterface(){
          return new MyImplementation();
public class Test{
           public static void main(String args[]){
                  MyInterface x=MyFactory.createMyInterface();
                  x..method1();
}Now can you understand this? Assume all These classes are separate classes. This is not a problem with inner classes. Before make a reply, try to understand it or post a reply as saying it is not clear rather than posting this kind of post.

Error processing WSDL document: java.lang.ClassCastException: java.util.Ar

Hi
Program is giving unpredictable behaviour.
Am trying to consume webservice using Axis Client.
When running as stand alone Java programs its working fine.
But when deployed on OC4J its giving problem
Error processing WSDL document: java.lang.ClassCastException: java.util.ArrayList
Could you please give some hint
Regards
Bajarang

Here is the program
QName serviceQN = new QName(targetNamespace,serviceName );
System.out.println("After serviceQN "+ serviceQN);
QName portQN = new QName( targetNamespace, portName );
System.out.println("After port "+ portQN);
// This Call object will be used the invocation
Service service = new Service(implURI,serviceQN);
System.out.println("After service "+ service);
Call call = (Call) service.createCall();
System.out.println("After call "+ call);
// Now make the call...
System.out.println("Invoking service>> " + serviceName + " <<...");
call.setOperation(portQN,operationName);
call.invoke( inputParams );
System.out.println("Result returned from call to "+ serviceName+" ");
Error while execution
javax.xml.rpc.ServiceException: Error processing WSDL document:
java.lang.ClassCastException: java.util.ArrayList

WSDL to Java conversation

I've got WSDL file. I want to produce Java sources for that WSDL.
When I try to use WebService context menu function - I've got restriction:
"SAP Netweaver not Apache Axis"
How can I convert WSDL to Java skeleton ??

Hello Christian!
I try to use "Developer Studio 7.10" and "Developer Studio 7.10 CE".
When I try to use DS 7.10 CE - I've got exception: "IWAB0014E Unexpected exception occured."
[code]
IWAB0014E Unexpected exception occured.
      java.lang.NullPointerException
      at com.sap.engine.services.webservices.espbase.client.ProxyGeneratorNew.getSOAPBindingAnnotation(ProxyGeneratorNew.java:2803)
      at com.sap.engine.services.webservices.espbase.client.ProxyGeneratorNew.genWebServiceAnnotation(ProxyGeneratorNew.java:2845)
      at com.sap.engine.services.webservices.espbase.client.ProxyGeneratorNew.generateSEI(ProxyGeneratorNew.java:2922)
      at com.sap.engine.services.webservices.espbase.client.ProxyGeneratorNew.generateInterfaces(ProxyGeneratorNew.java:1031)
      at com.sap.engine.services.webservices.espbase.client.ProxyGeneratorNew.generateAll(ProxyGeneratorNew.java:335)
      at com.sap.ide.es.ws.jee5.runtime.provider.internal.generator.topdown.Ejb3TopDownProviderGenerator.generateProvider(Ejb3TopDownProviderGenerator.java:260)
      at com.sap.ide.es.ws.jee5.core.provider.commands.GenerateTopDownWebService.doWork(GenerateTopDownWebService.java:28)
      at com.sap.ide.es.ws.jee5.core.provider.commands.OneShotOperation.execute(OneShotOperation.java:51)
      at org.eclipse.wst.command.internal.env.core.fragment.CommandFragmentEngine.runCommand(CommandFragmentEngine.java:413)
      at org.eclipse.wst.command.internal.env.core.fragment.CommandFragmentEngine.visitTop(CommandFragmentEngine.java:353)
      at org.eclipse.wst.command.internal.env.core.fragment.CommandFragmentEngine.moveForwardToNextStop(CommandFragmentEngine.java:251)
      at org.eclipse.wst.command.internal.env.ui.widgets.SimpleCommandEngineManager$5.run(SimpleCommandEngineManager.java:250)
      at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369)
      at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313)
      at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:851)
      at org.eclipse.wst.command.internal.env.ui.widgets.SimpleCommandEngineManager.runForwardToNextStop(SimpleCommandEngineManager.java:220)
      at org.eclipse.wst.command.internal.env.ui.widgets.WizardPageManager.runForwardToNextStop(WizardPageManager.java:94)
      at org.eclipse.wst.command.internal.env.ui.widgets.WizardPageManager.getNextPage(WizardPageManager.java:145)
      at org.eclipse.wst.command.internal.env.ui.widgets.SimpleWizardPage.getNextPage(SimpleWizardPage.java:136)
      at org.eclipse.jface.wizard.WizardDialog.nextPressed(WizardDialog.java:751)
      at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:351)
      at org.eclipse.jface.dialogs.Dialog$3.widgetSelected(Dialog.java:660)
      at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
      at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
      at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
      at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
      at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
      at org.eclipse.jface.window.Window.open(Window.java:796)
      at org.eclipse.wst.command.internal.env.ui.widgets.popup.DynamicPopupWizard.run(DynamicPopupWizard.java:130)
      at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:254)
      at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539)
      at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)
      at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400)
      at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
      at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
      at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
      at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
      at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
      at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
      at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
      at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
      at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
      at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
      at org.eclipse.core.launcher.Main.run(Main.java:977)
      at org.eclipse.core.launcher.Main.main(Main.java:952)
[/code]
When I try to use simple DS 7.10 - I've got strange situation: when I try to generate Java Skeleton as you write before, I can't choose "SAP Netweaver" as server runtime - only Axis available!!
Can you help me register "SAP Netweaver" runtime in eclipse?
BR Dedevich Alexey
P.S. In Eclipse preference I see "SAP Netweaver" runtime? but when I try to generate Java skeleton from wsdl - there are no any runtime's except Axis.

Java interface with Crystal Reports

Post Author: [email protected]
CA Forum: JAVA
Hello everyone,I need to build a Java interface for JSP to interact with crystal reports.Could anyone recommend any book or forward me the url's where I can find the related material with examples. Eagerly Waiting for reply!Thanks,Prathima.

Post Author: MJ@BOBJ
CA Forum: JAVA
The latest version of the Java Report Component (JRC) is available from the Diamond website. This download is actually a plugin for Eclipse but you can still use the JRC runtime jars to use the SDK APIs in your JSP page. You will also find lots of resources such as samples, videos, and forums to help you get started. You can also refer to the DevLibrary for more information.

PI 7.0 - Contract First

Hi All,
Is it possible to use Contract First in PI 7.0?
Regards,
Marcelo

Hi Marcelo,
Yes, Contract First is a SOA community term which corresponds to the Outside in development approach in SAP Netweaver. If I'm not mistaken it can be done in PI 7.0.
Regards,
Erwin

Java interface as an Axis Web Service

Hi averybody:
I'm developping an application containning a web service using Axis 1.2 with Tomcat 5.5.7. I had design a Java interface for the WS and create mi deploy.wsdd file for it using Message-style.
Everithing goes right in deployment process, but when i try too use de WS from a client, i get de following error:
Exception in thread "main" AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.lang.InstantiationException: chatService.IChatServer
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}hostname: visit18 (este el nombre de esta m�quina)
java.lang.InstantiationException: chatService.IChatServer (esto es lo que da problema)
at org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder
.java:260)
at org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.
java:169)
at org.apache.axis.encoding.DeserializationContextImpl.endElement(Deseri
alizationContextImpl.java:1015)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(AbstractSAXPar
ser.java:585)
at org.apache.xerces.impl.XMLNamespaceBinder.handleEndElement(XMLNamespa
ceBinder.java:898)
at org.apache.xerces.impl.XMLNamespaceBinder.endElement(XMLNamespaceBind
er.java:644)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(
XMLDocumentFragmentScannerImpl.java:1008)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContent
Dispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1469)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XM
LDocumentFragmentScannerImpl.java:329)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.jav
a:525)
at org.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.jav
a:581)
at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)
at org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.j
ava:1175)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at org.apache.axis.encoding.DeserializationContextImpl.parse(Deserializa
tionContextImpl.java:242)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:538)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:376)
at org.apache.axis.client.Call.invokeEngine(Call.java:2583)
at org.apache.axis.client.Call.invoke(Call.java:2553)
at org.apache.axis.client.Call.invoke(Call.java:2248)
at org.apache.axis.client.Call.invoke(Call.java:2171)
at org.apache.axis.client.Call.invoke(Call.java:1691)
at samples.message.TestChatMsg.doit(TestChatMsg.java:64)
at samples.message.TestChatMsg.main(TestChatMsg.java:86)
The code of my interface is this:
public interface IChatServer {
public void connect(SOAPEnvelope req, SOAPEnvelope resp);
public void disconnect(SOAPEnvelope req, SOAPEnvelope resp);
public void publishMessage(SOAPEnvelope req, SOAPEnvelope resp);
public void retrieveMessages(SOAPEnvelope req, SOAPEnvelope resp);
public void retrieveUsers(SOAPEnvelope req, SOAPEnvelope resp);
Can anybody tell me what's happening here...
Thanks.

Hi, did you find out what the problem was ?
I've got the same problem.
Thanks,
Lotte

Can I take Java interface as .h of C?

Can I use Java interface as a substitute of .h files in C?

It almost sounds as if you want to use C, not an OOP language like Java. So why not use C?

Contract-first : WSDL vs Java interface

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