JAX-WS Provider

Web Service endpoints may choose to work at the XML message level by implementing the Provider interface. This is achieved by implementing either Provider<Source> or Provider<SOAPMessage> or Provider<DataSource>. The endpoint accesses the message or message payload using this low-level, generic API. This has to be a WSDL first approach. Let's assume that we have WSDL for getting the Price of the Product. the WSDL looks as follows:

<definitions name="RequestPriceProvider"

    targetNamespace="http://www.lalit.com/om"

    xmlns:omTypes="http://www.lalit.com/omTypes"

    xmlns:tns="http://www.lalit.com/om"

    xmlns="http://schemas.xmlsoap.org/wsdl/"

    xmlns:xsd="http://www.w3.org/2001/XMLSchema"

    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"> 

 <types>

    <xsd:schema targetNamespace="http://www.lalit.com/omTypes"

            xmlns:s1="http://www.lalit.com/omTypes">

    <xsd:element name="product" type="s1:product" />

    <xsd:complexType name="product">

        <xsd:sequence>

            <xsd:element name="name" type="xsd:string" />

            <xsd:element name="value" type="xsd:float" />

        </xsd:sequence>

    </xsd:complexType>

    </xsd:schema>

</types>

    <message name="RequestPrice">

        <part name="name" element="omTypes:product" />

    </message>

    <portType name="RequestOrderPort">

        <operation name="getPrice">

            <input message="tns:RequestPrice" />

            <output message="tns:RequestPrice" />

        </operation>

    </portType>    

<binding name="RequestPriceBinding" type="tns:RequestOrderPort">

    <soap:binding transport="http://schemas.xmlsoap.org/soap/http"

            style="document" />

    <operation name="getPrice">

        <soap:operation soapAction="" />

        <input>

        <soap:body use="literal" namespace="http://www.lalit.com/jws/wsdl" />

        </input>

        <output>

        <soap:body use="literal"

            namespace="http://www.lalit.com/jws/wsdl" />

        </output>

    </operation>

    </binding>

    <service name="RequestPrice_Service">

        <port name="RequestOrderPort"

            binding="tns:RequestPriceBinding">

            <soap:address location="REPLACE_WITH_ACTUAL_URL" />

        </port>

    </service>

</definitions>

Write the Provider class

@WebServiceProvider(serviceName = "RequestPriceProvider",

    portName="RequestOrderPort",

    targetNamespace = "http://www.lalit.com/om",

     wsdlLocation="WEB-INF/wsdl/RequestPriceProvider.wsdl")

@ServiceMode(value=Service.Mode.PAYLOAD)

public class RequestPriceProvider implements Provider<Source>{

    public Source invoke(Source request) {

        …

        return resp;

    }

}

Here you have to deal at XML level and build the response yourself.

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