how to consume a web service in mule flow? - web-services

Question

I am beginning with Mule flows. I am trying to consume a webservice in it.
But I am getting some some errors while running.
Error reported by XML parser: Content is not allowed in prolog
Here is my code
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:ws="http://www.mulesoft.org/schema/mule/ws" xmlns:data-mapper="http://www.mulesoft.org/schema/mule/ee/data-mapper" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.6.1"
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-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ws http://www.mulesoft.org/schema/mule/ws/current/mule-ws.xsd
http://www.mulesoft.org/schema/mule/ee/data-mapper http://www.mulesoft.org/schema/mule/ee/data-mapper/current/mule-data-mapper.xsd">
<http:listener-config name="HTTP_Listener_Configuration" host="localhost" port="8095" doc:name="HTTP Listener Configuration"/>
<ws:consumer-config name="Web_Service_Consumer" wsdlLocation="MSCRMDiscoveryService_WSDL.wsdl" service="DiscoveryService" port="CustomBinding_IDiscoveryService" serviceAddress="https://disco.crm5.dynamics.com/XRMServices/2011/Discovery.svc" doc:name="Web Service Consumer"/>
<data-mapper:config name="Xml_ExecuteResponse__To_Xml_Execute_" transformationGraphPath="xml_executeresponse__to_xml_execute_.grf" doc:name="Xml_ExecuteResponse__To_Xml_Execute_"/>
<data-mapper:config name="Xml_ExecuteResponse__To_Xml_Execute__1" transformationGraphPath="xml_executeresponse__to_xml_execute__1.grf" doc:name="Xml_ExecuteResponse__To_Xml_Execute__1"/>
<flow name="mscrmdiscoveryservice-consumerFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="*" doc:name="HTTP"/>
<data-mapper:transform config-ref="Xml_ExecuteResponse__To_Xml_Execute_" doc:name="Xml<ExecuteResponse> To Xml<Execute>"/>
<ws:consumer config-ref="Web_Service_Consumer" operation="Execute" doc:name="Web Service Consumer"/>
<data-mapper:transform config-ref="Xml_ExecuteResponse__To_Xml_Execute__1" doc:name="Xml<ExecuteResponse> To Xml<Execute>"/>
</flow>
</mule>
wsdl file
<?xml version='1.0' encoding='UTF-8'?><wsdl:definitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://example.org/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:ns1="http://schemas.xmlsoap.org/soap/http" name="HelloWorldService" targetNamespace="http://example.org/">
<wsdl:types>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.org/" elementFormDefault="unqualified" targetNamespace="http://example.org/" version="1.0">
<xs:element name="sayHi" type="tns:sayHi"/>
<xs:element name="sayHiResponse" type="tns:sayHiResponse"/>
<xs:complexType name="sayHi">
<xs:sequence>
<xs:element minOccurs="0" name="arg0" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="sayHiResponse">
<xs:sequence>
<xs:element minOccurs="0" name="return" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
</wsdl:types>
<wsdl:message name="sayHi">
<wsdl:part element="tns:sayHi" name="parameters">
</wsdl:part>
</wsdl:message>
<wsdl:message name="sayHiResponse">
<wsdl:part element="tns:sayHiResponse" name="parameters">
</wsdl:part>
</wsdl:message>
<wsdl:portType name="HelloWorld">
<wsdl:operation name="sayHi">
<wsdl:input message="tns:sayHi" name="sayHi">
</wsdl:input>
<wsdl:output message="tns:sayHiResponse" name="sayHiResponse">
</wsdl:output>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="HelloWorldServiceSoapBinding" type="tns:HelloWorld">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="sayHi">
<soap:operation soapAction="" style="document"/>
<wsdl:input name="sayHi">
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output name="sayHiResponse">
<soap:body use="literal"/>
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="HelloWorldService">
<wsdl:port binding="tns:HelloWorldServiceSoapBinding" name="HelloWorldPort">
<soap:address location="http://localhost:8085/hello"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
How can I fix this error?

Answer 1

From the flow you shared, is difficult to tell where the error exactly exists ... It may be your from your wrong XML structure.
Also not clear the use of Datamapper in consuming external web service
The easiest way to consume an existing web service from Mule flow is to prepare/build the soap request for the external service using set payload or XSLT transformer, and then dispatch it through HTTP outbound or HTTP request component.