How to invoke a web service asynchronously using ws-addressing model?

Question

Hi Gurus,
We are invoking an external web service asynchronously using Oracle Work Flow Business events using the following mechanism -
1)Created a web service invoker event to invoke the web service.
2)Created a subscription that invokes the web service (provided the wsdl address, operation info).
3)Defined a subscription parameter WFBES_CALLBACK_EVENT with value pointing to a recieve event.
4)Created a receive event(parameter value for WFBES_CALLBACK_EVENT) and a subscription that directs the response to a custom PL/SQL function to process response.
so far so good. We were able to invoke the web service and get and process the response.
Problem: The external web service can take upto 10 hrs to process the request. A time out of 2 hrs is set on the server hosting the external web service. So when the external web service takes more than 2 hrs to process the request and it times out and we get the following error on EBS side -
'l_error_message:oracle.apps.fnd.wf.bes.InvokerException: HTTP transport error: javax.xml.soap.SOAPException: java.security.PrivilegedActionException: oracle.j2ee.ws.saaj.ContentTypeException: Not a valid SOAP Content-Type: text/html; charset=iso-8859-1'
Now the external web service providers are suggesting that we are not calling their web service asynchronously and we should use ws-addressing model to do so.
Is there a way to invoke this web service using ws-addressing model using business events or from PL/SQL or OA middle-tier?
Regards,
Sunil
CMRO Development.
I am providing here the WSDL of the external web service -
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://service.sdk.webservices.enigma.com" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:ns1="http://org.apache.axis2/xsd" xmlns:wsaw="http://www.w3.org/2006/05/addressing/wsdl" xmlns:ax21="http://service.sdk.webservices.enigma.com/xsd" xmlns:ns="http://service.sdk.webservices.enigma.com" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
<wsdl:types>
<xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="http://service.sdk.webservices.enigma.com/xsd" xmlns:ax22="http://service.sdk.webservices.enigma.com">
<xs:import namespace="http://service.sdk.webservices.enigma.com"/>
<xs:complexType name="JCGWebServicesException">
<xs:complexContent>
<xs:extension base="ax22:Exception">
<xs:sequence>
<xs:element minOccurs="0" name="id" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="message" nillable="true" type="xs:string"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="JCGServiceReply">
<xs:sequence>
<xs:element maxOccurs="unbounded" minOccurs="0" name="pdfStatus" nillable="true" type="ax21:PdfStatus"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="PdfStatus">
<xs:sequence>
<xs:element minOccurs="0" name="jobCardID" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="pdfPath" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="status" nillable="true" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
<xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="http://service.sdk.webservices.enigma.com" xmlns:ax23="http://service.sdk.webservices.enigma.com/xsd">
<xs:import namespace="http://service.sdk.webservices.enigma.com/xsd"/>
<xs:complexType name="Exception">
<xs:sequence>
<xs:element minOccurs="0" name="Exception" nillable="true" type="xs:anyType"/>
</xs:sequence>
</xs:complexType>
<xs:element name="JCGWebServicesException">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" name="JCGWebServicesException" nillable="true" type="ax21:JCGWebServicesException"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="runJobCard">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" name="a_WorkpackageFilePath" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="a_userName" nillable="true" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="runJobCardResponse">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" name="return" nillable="true" type="ax21:JCGServiceReply"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
</wsdl:types>
<wsdl:message name="JCGWebServicesException">
<wsdl:part name="parameters" element="ns:JCGWebServicesException">
</wsdl:part>
</wsdl:message>
<wsdl:message name="runJobCardResponse">
<wsdl:part name="parameters" element="ns:runJobCardResponse">
</wsdl:part>
</wsdl:message>
<wsdl:message name="runJobCardRequest">
<wsdl:part name="parameters" element="ns:runJobCard">
</wsdl:part>
</wsdl:message>
<wsdl:portType name="JCGServicePortType">
<wsdl:operation name="runJobCard">
<wsdl:input message="ns:runJobCardRequest" wsaw:Action="urn:runJobCard">
</wsdl:input>
<wsdl:output message="ns:runJobCardResponse" wsaw:Action="urn:runJobCardResponse">
</wsdl:output>
<wsdl:fault name="JCGWebServicesException" message="ns:JCGWebServicesException" wsaw:Action="urn:runJobCardJCGWebServicesException">
</wsdl:fault>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="JCGServiceSoap11Binding" type="ns:JCGServicePortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="runJobCard">
<soap:operation soapAction="urn:runJobCard" style="document"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap:body use="literal"/>
</wsdl:output>
<wsdl:fault name="JCGWebServicesException">
<soap:fault name="JCGWebServicesException" use="literal"/>
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<wsdl:binding name="JCGServiceSoap12Binding" type="ns:JCGServicePortType">
<soap12:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="runJobCard">
<soap12:operation soapAction="urn:runJobCard" style="document"/>
<wsdl:input>
<soap12:body use="literal"/>
</wsdl:input>
<wsdl:output>
<soap12:body use="literal"/>
</wsdl:output>
<wsdl:fault name="JCGWebServicesException">
<soap12:fault name="JCGWebServicesException" use="literal"/>
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="JCGService">
<wsdl:port name="JCGServiceHttpSoap12Endpoint" binding="ns:JCGServiceSoap12Binding">
<soap12:address location="http://localhost:8080/JCG/services/JCGService"/>
</wsdl:port>
<wsdl:port name="JCGServiceHttpSoap11Endpoint" binding="ns:JCGServiceSoap11Binding">
<soap:address location="http://localhost:8080/JCG/services/JCGService"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
Edited by: sikumar on Jun 22, 2010 1:50 PM

Answer 1

Bharat,
You dont need a Business Event setup to invoke a BPEL process from PL/SQL unless you have a special case and you need to process the response from the BPEL process in a separate thread (or in background)..
For a straight call to BPEL process from PL/SQL, here is a sample script -
function "MYTEST0" return varchar2 AS
soap_request varchar2(30000);
soap_respond varchar2(30000);
http_req utl_http.req;
http_resp utl_http.resp;
resp XMLType;
i integer;
helpStr varchar2(30000);
BEGIN
soap_request:= '<?xml version = ''1.0'' encoding = ''UTF-8''?>
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns0="
http://xmlns.oracle.com/TestWS">
<env:Body>
<ns0:TestWSProcessRequest>
<ns0:input>abc</ns0:input>
</ns0:TestWSProcessRequest>
</env:Body>
</env:Envelope>
/* the BPEL process name is TestWS */
http_req:= utl_http.begin_request
( 'http://hostname:7777/orabpel/default/TestWS/1.0'
, 'POST'
, 'HTTP/1.1'
utl_http.set_header(http_req, 'Content-Type', 'text/xml');
utl_http.set_header(http_req, 'Content-Length', length(soap_request));
utl_http.set_header(http_req, 'SOAPAction', 'process');
utl_http.write_text(http_req, soap_request);
http_resp:= utl_http.get_response(http_req);
utl_http.read_text(http_resp, soap_respond);
utl_http.end_response(http_resp);
resp:= XMLType.createXML(soap_respond);
resp:= resp.extract('/soap:Envelope/soap:Body/child::node()',
'xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"');
helpStr := '';
i:=0;
loop
helpStr := helpStr || substr(soap_respond,1+ i*255,250);
i:= i+1;
if i*250> length(soap_respond)
then
exit;
end if;
end loop;
return helpStr;
END;