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Monday April 28, 2008

5 Techniques to Create Web Service (from WSDL)

In this article, I am going to implement a simple Document/Literal web service, from existing wsdl file, using 3 different databinding frameworks and 2 low level approaches. The goal is to compare the frameworks, mainly from the ease of use perspective. For demo purposes, I have chosen the Netbeans6.1 with standard Web Service functionality and Axis2 plugin. The standard WS support in Netbeans is based on JAX-WS stack. These are the frameworks used in the blog:

JAX-WS 2.1 (java artifacts generated with wsimport)
JAX-WS 2.1 (Provider API implementation)
Axis with ADB (Axis Databinding)
AXIOM (Axis Object Model)
Axis with Xmlbeans

WSDL File

Initially I wanted to use the simple AddNumbers.html file from JAX-WS2.1 examples but I hit to problems related to java artifacts generation with both Axis ADB and Xmlbeans. After some investigation I found the reason. ADB as well as Xmlbeans have problem to generate java artifacts if A: wsdl namespace and schema namespace are identical and B:the <wsdl:message> representing <wsdl:fault> has the same name as schema element. Though the wsdl file is WS-I compliant the 2 databinding technoplogies failed. I tested also JiBX databinding with no success. To go on I had to modify the wsdl file a little: AddNumbers.wsdl (the schema namespace is changed).
Note: Even after this change the JiBX databinding failed to generate java classes (I used Axis2 wsdl4j task) so I decided not to involve JiBX into this blog.

JAX-WS 2.1 (java artifacts generated with wsimport)

For this purpose I've created new web application project and used Web Service Wrom WSDL wizard in Web Services category. The implementation was easy:

@WebService(serviceName = "AddNumbersService", portName = "AddNumbersPort", endpointInterface = "org.example.duke.AddNumbersPortType",
            targetNamespace = "http://duke.example.org", wsdlLocation = "WEB-INF/wsdl/AddNumbersImpl/AddNumbers.wsdl")
public class AddNumbersImpl implements AddNumbersPortType {

    public int addNumbers(int arg0, int arg1) throws AddNumbersFault {
        int result = arg0+arg1;
        if (result < 0) {
            org.example.duke.xsd.AddNumbersFault fault = new org.example.duke.xsd.AddNumbersFault();
            fault.setMessage("the result is negative");
            fault.setFaultInfo("negative result: "+result);
            throw new AddNumbersFault("error", fault);
        } else {
            return result;
        }
    }

    public void oneWayInt(int arg0) {
        System.out.println("JAX-WS: oneWayInt request "+arg0);
    }

}

The implementation is really easy as wsimport by default generates Web Service (SEI class) methods in Wrapping Style mode, which means for requests, responses represented by a sequence of xsd primitive types, the WS method works directly with java primitive types. For that reason JAX-WS uses the @javax.xml.ws.RequestWrapper and @javax.xml.ws.ResponseWrapper annotations in generated SEI class. The most complex, but not difficult, was the implementation of AddNumbersFault: the exception is thrown when the result is negative. Netbeans Code Completion helped me greatly in this area.

JAX-WS 2.1 (Provider API implementation)

To implement the low level approach supporting by JAX-WS 2.1. I used the standard Web Service from WSDL wizard, and I checked the Use Provider checkbox (new Netbeans 6.1 feature). The implementation requires to know the structure of XML request and XML response. See that XML DOM API is used to process the request, while the response is written directly as plain XML text. The hardiest part for me was to implement the Fault correctly.

@ServiceMode(value = javax.xml.ws.Service.Mode.PAYLOAD)
@WebServiceProvider(serviceName = "AddNumbersService", portName = "AddNumbersPort", 
                    targetNamespace = "http://duke.example.org", wsdlLocation = "WEB-INF/wsdl/AddNumbersImpl/AddNumbers.wsdl")
public class AddNumbersImpl implements javax.xml.ws.Provider<javax.xml.transform.Source> {

    public javax.xml.transform.Source invoke(javax.xml.transform.Source source) {
        try {
            DOMResult dom = new DOMResult();
            Transformer trans = TransformerFactory.newInstance().newTransformer();
            trans.transform(source, dom);
            Node node = dom.getNode();
            Node root = node.getFirstChild();
            Node first = root.getFirstChild();
            int number1 = Integer.decode(first.getFirstChild().getNodeValue());
            Node second = first.getNextSibling();
            int number2 = Integer.decode(second.getFirstChild().getNodeValue());
            int result = number1+number2;
            if (result < 0) {
                return getFault(result);
            } else {
                return getResponse(result);
            }
        } catch(Exception e) {
            throw new RuntimeException("Error in provider endpoint", e);
        }
    }
    
    private Source getResponse(int result) {
        String body =
            "<ns:addNumbersResponse xmlns:ns=\"http://duke.example.org/xsd\"><ns:return>"
            +result
            +"</ns:return></ns:addNumbersResponse>";
        Source source = new StreamSource(
            new ByteArrayInputStream(body.getBytes()));
        return source;
    }
    
    private Source getFault(int result) {
        String body =
            "<nsf:Fault xmlns:nsf=\"http://schemas.xmlsoap.org/soap/envelope/\">"
            +"<faultcode>nsf:Server</faultcode>"
            +"<faultstring>error</faultstring>"
            +"<detail>"
            +"<ns:AddNumbersFault xmlns:ns=\"http://duke.example.org/xsd\">"
            +"<ns:faultInfo>negative result "+result+"</ns:faultInfo>"
            +"<ns:message>the result is negative</ns:message>"
            +"</ns:AddNumbersFault>"
            +"</detail>"
            +"</nsf:Fault>";
        Source source = new StreamSource(
            new ByteArrayInputStream(body.getBytes()));
        return source;
    }
}

Another option is to use JAXB data binding to process the request and/or to generate the response. JAXB can be used comfortably with Provider API. Advantage of this approach is that implementation code works with JAXB classes generated from schema file rather than with low level DOM objects. The dark side is that JAXB classes (derived from schema file) should be generated in advance. I just copied the content of org.example.duke.xsd package from previous example:

    public javax.xml.transform.Source invoke(javax.xml.transform.Source source) {
        try {
            JAXBContext jc = JAXBContext.newInstance( "org.example.duke.xsd" );
            Unmarshaller unmarshaller = jc.createUnmarshaller();
            JAXBElement<AddNumbers> requestEl = (JAXBElement) unmarshaller.unmarshal(source);
            AddNumbers addNum = requestEl.getValue();
            int result = addNum.getArg0()+addNum.getArg1();
            if (result < 0) {
                  return getFault(result);
            } else {
                AddNumbersResponse response = new AddNumbersResponse();
                response.setReturn(result);
                JAXBElement<AddNumbersResponse> responseEl = new ObjectFactory().createAddNumbersResponse(response);
                return new JAXBSource(jc, responseEl);
            }
        } catch (JAXBException e) {
            throw new RuntimeException("Error in provider endpoint", e);
        }
    }

Note: The biggest advantage of JAX-WS Provider/Dispatcher API is the ability to implement/consume web services even for the cases where wsimport fails (e.g. RPC/Encoded WSDL). See Accessing Google Web Service using JAX-WS. Another option would be to implement the invoke method with SOAPMessage parameter instead of javax.xml.transform.Source. This is more convenient than DOM but requires to work with entire SOAP message rather than with SOAP payload.

Axis with ADB (Axis Databinding)

To implement web service using Axis ADB I installed the Axis2 plugin on the top of Netbeans 6.1. To set up Netbeans with Axis2 support see the tutorial: Creating Apache Axis2 Web Services on NetBeans IDE. To create web service from wsdl file I used the Axis Web Service from WSDL wizard from Web Services category. In the wizard, the wsdl file can be selected in Name and Location Panel and ADB databinding stack in Code Generator Options panel -> Databinding Technology combo box. The Axis2 wsdl4j utility is called from the wizard, and the skeleton class for web service is generated to implement. The implementation is fairly simple, intuitive and straightforward. The code completions helps a lot :

public class AddNumbersImpl implements AddNumbersServiceSkeletonInterface {

    public AddNumbersResponse2 addNumbers(AddNumbers1 addNumbers0) throws AddNumbersFault {
        int result = addNumbers0.getAddNumbers().getArg0() + addNumbers0.getAddNumbers().getArg1();
        if (result < 0) {
            AddNumbersFault fault = new AddNumbersFault();
            AddNumbersFault0 faultMessage = new AddNumbersFault0();
            org.example.duke.xsd.AddNumbersFault fDetail = new org.example.duke.xsd.AddNumbersFault();
            fDetail.setFaultInfo("negative result "+result);fDetail.setMessage("the result is negative");
            faultMessage.setAddNumbersFault(fDetail);
            fault.setFaultMessage(faultMessage);
            throw fault;
        } else {
            AddNumbersResponse resp = new AddNumbersResponse();
            resp.set_return(result);
            AddNumbersResponse2 response = new AddNumbersResponse2();
            response.setAddNumbersResponse(resp);
            return response;
        }
    }

    public void oneWayInt(org.example.duke.xsd.OneWayInt3 oneWayInt2) {
        try {
            OMElement request = oneWayInt2.getOMElement(OneWayInt3.MY_QNAME, OMAbstractFactory.getOMFactory());
            System.out.println("ADB:oneWayInt request: "+request);
        } catch (ADBException ex) {
            ex.printStackTrace();
        }
    }
}

Note: Axis2 doesn't use the Wrapping Style, so the parameter of AddNumbers method, in skeleton class, is AddNumbers1 object instead of 2 int parameters (I didn't find if axis2 enables to set up wrapping style).

AXIOM (AxisObject Model)

This is a low level technique, similar to JAX-WS Provider/Dispatcherer API. Working with OM nodes and elemens is more comfortable comparing to DOM but less comparing to ADB or JAXB. I'd compare it to working with SAAJ API. The imlementation is also quite straightforward but requires the knowledge of AXIOM API. The skeleton class can be generated by Axis Service from Wsdl wizard by selecting the AXIOM Databinding Technology.
Again, I spent the most of the time by Fault implementation:

 
public class AddNumbersImpl {
    private static final String SCHEMA_NAMESPACE = "http://duke.example.org/xsd";
    private OMFactory omFactory = OMAbstractFactory.getOMFactory();

    public OMElement addNumbers(OMElement requestElement) throws XMLStreamException {
        
        int value1 = Integer.valueOf(getRequestParam(requestElement, "arg0")).intValue();
        int value2 = Integer.valueOf(getRequestParam(requestElement, "arg1")).intValue();
        int result = value1+value2;
        if (result < 0) {
                       
            OMNode text = omFactory.createOMText("negative result");
            OMNode text1 = omFactory.createOMText("the result is negative");
            
            OMNamespace omNs = omFactory.createOMNamespace(SCHEMA_NAMESPACE, "ns");
            
            OMElement responseChildElement = omFactory.createOMElement("faultInfo", omNs);
            responseChildElement.addChild(text);
            OMElement responseChildElement1 = omFactory.createOMElement("message", omNs);
            responseChildElement1.addChild(text1);
            
            OMElement faultElement = omFactory.createOMElement("AddNumbersFault", omNs);
            faultElement.addChild(responseChildElement);
            faultElement.addChild(responseChildElement1);
            
            
            SOAPFault fault = OMAbstractFactory.getSOAP11Factory().createSOAPFault();
            SOAPFaultCode code = OMAbstractFactory.getSOAP11Factory().createSOAPFaultCode();
            code.setText(fault.getNamespace().getPrefix()+":Server");
            
            SOAPFaultReason faultstring = OMAbstractFactory.getSOAP11Factory().createSOAPFaultReason();
            faultstring.setText("negative result");
            
            SOAPFaultDetail detail = OMAbstractFactory.getSOAP11Factory().createSOAPFaultDetail();
            detail.addChild(faultElement);
            
            fault.setCode(code);
            fault.setReason(faultstring);
            fault.setDetail(detail);
            
            return fault;

        } else {
            String resultStr = String.valueOf(result);        
            OMNode response = omFactory.createOMText(resultStr);
            return createResponse("addNumbersResponse", "return", response);
        }
    }

    public void oneWayInt(OMElement requestElement) throws XMLStreamException {
        System.out.println("AXIOM:oneWayInt request: "+requestElement);
    }
    
    private String getRequestParam(OMElement requestElement, String requestChildName) {
        OMElement requestChildElement = 
            requestElement.getFirstChildWithName(new QName(SCHEMA_NAMESPACE, requestChildName));
        return requestChildElement.getText();        
    }
  
    private OMElement createResponse(String responseElementName, String responseChildName, OMNode response) {
        OMNamespace omNs = omFactory.createOMNamespace(SCHEMA_NAMESPACE, "ns");
        OMElement responseElement = omFactory.createOMElement(responseElementName, omNs);
        OMElement responseChildElement = omFactory.createOMElement(responseChildName, omNs);
        responseChildElement.addChild(response);
        responseElement.addChild(responseChildElement);
        return responseElement;
    }
}

Axis with Xmlbeans

This is the WS Stack supporting also by Axis2 technology. The skeleton class can be generated by Axis Service from Wsdl wizard by selecting the Xmlbeans Databinding Technology.
The implementation is quite straightforward similar to Axis2 ADB. The awkwardness of this approach is the number of classes(225) generated by selecting this option. I am not an expert in Xmlbeans so this number may be reduced somehow. This is the implementation class:

public class AddNumbersImpl implements AddNumbersServiceSkeletonInterface {

    public AddNumbersResponseDocument addNumbers(org.example.duke.xsd.AddNumbersDocument addNumbers0) throws AddNumbersFault {
        //System.out.println("Xmlbeans: addNumbers request: "+addNumbers0);
        int result = addNumbers0.getAddNumbers().getArg0() + addNumbers0.getAddNumbers().getArg1();
        if (result < 0) {
            AddNumbersFault fault = new AddNumbersFault();
            AddNumbersFaultDocument faultDoc = AddNumbersFaultDocument.Factory.newInstance();
            org.example.duke.xsd.AddNumbersFault fDetail = org.example.duke.xsd.AddNumbersFault.Factory.newInstance();
            fDetail.setFaultInfo("negative result "+result);
            fDetail.setMessage("the result is negative");
            faultDoc.setAddNumbersFault(fDetail);
            fault.setFaultMessage(faultDoc);
            throw fault;
        }
        AddNumbersResponseDocument response = AddNumbersResponseDocument.Factory.newInstance();
        AddNumbersResponse resp = AddNumbersResponse.Factory.newInstance();
        resp.setReturn(result);
        response.setAddNumbersResponse(resp);
        return response;
    }

    public void oneWayInt(org.example.duke.xsd.OneWayIntDocument oneWayInt2) {
        //TODO implement this method
        System.out.println("Xmlbeans: oneWayInt request: "+oneWayInt2);
    }

}

Summary

    public static void main(String[] args) {

        addnumbers3.AddNumbersService3 service = new addnumbers3.AddNumbersService3();
        addnumbers3.AddNumbersService3PortType port = service.getAddNumbersService3SOAP11PortHttp();
        ((BindingProvider) port).getRequestContext().put(
        BindingProvider.ENDPOINT_ADDRESS_PROPERTY,
            // this value depends on real location of the service wsdl
            "http://localhost:8084/axis2/services/AddNumbersService3?wsdl");
        
        long sum = 0L;
        Random random = new Random(System.currentTimeMillis());
        for (int i=0;i<10000;i++) {
            try { // Call Web Service Operation

               int arg0 = random.nextInt(100);
               int arg1 = random.nextInt(100);
               // TODO process result here
               long startTime = System.currentTimeMillis();
               int result = port.addNumbers(arg0, arg1);
               long endTime = System.currentTimeMillis();
               long time = (endTime - startTime);
               sum+=time;
            } catch (AddNumbersFault_Exception ex) {
                System.out.println("fault = "+ex.getFaultInfo().getFaultInfo()+":"+ex.getFaultInfo().getMessage());
            }
        }
        double avrg = sum/10000.0;
        System.out.println("Avarage response time = "+avrg);
    }

Finally this is the result table considering 3 aspects: Ease of Implementation, Response Time and the Number of Generated Classes:

Technique	Ease of Implementation	Response Time	Generated Classes
JAX-WS (with wsimport)	*****	0.57 ms	9
JAX-WS (Provider API without JAXB)	*	1.15 ms	0
JAX-WS (Provider API with JAXB)	***	2.36 ms	6
Axis2 with ADB	****	0.62 ms	14
Axis2 with Xmlbeans	****	0.69 ms	225
AXIOM	**	0.65 ms	0

Note: the response times are relative depending on hardware configuration. The Ease of Use aspect may be considered subjective depending on how much experience you have with particular WS Stack.

Posted at 06:37PM Apr 28, 2008 by Milan Kuchtiak in NetBeans | Comments[101]

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