Validating SOAP message against WSDL with multiple XSD's

Question

I've been looking around the net for a good few hours now, trying to find a simple way to validate a full SOAP message against a WSDL. I am aware that there are ways to do this with the various Web Service frameworks out there, but I don't want to do this as the requirement is simply to validate a piece of XML. I could validate against the schema, although the problem I have is that there are a number of schemas imported into the WSDL and I don't know which one I should be validating against. I could write some utility to first process the WSDL and the response to determine which XSD to validate against, but I presumed this could be done as a one-liner using an established library!

Does anyone know of a relatively straightforward way to validate an XML document given a WSDL and multiple XSD's?

score 4 · Accepted Answer · answered Jan 23 '12 at 22:31

In a previous project I solved this problem by parsing the WSDL-file and extracting the schemas from it. The code was something like the following, it assumes that the WSDL has been read into the Source variable "wsdlSource" in some way and that the imported namespaces are declared in the "schema"-element. It would probably be a good idea to have this performed once on startup and then do the validation in a SOAPHandler.

    //First create a document from the WSDL-source
    DocumentBuilder db = DocumentBuilderFactory.newInstance()
                .newDocumentBuilder();
    Document wsdlDoc = db.newDocument();

    TransformerFactory transformerFactory = TransformerFactory
                .newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    transformer.transform(wsdlSource, new DOMResult(wsdlDoc));

    //Now get the schemas from the WSDL 
    NodeList schemaNodes = wsdlDoc.getElementsByTagNameNS(
            XMLConstants.W3C_XML_SCHEMA_NS_URI, "schema");

    int nrSchemas = schemaNodes.getLength();

    Source[] schemas = new Source[nrSchemas];

    for (int i = 0; i < nrSchemas; i++) {
        schemas[i] = new DOMSource(schemaNodes.item(i));
    }

    SchemaFactory schemaFactory = SchemaFactory
            .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

    //Now we have a schema that can validate the payload
    Schema schema = schemaFactory.newSchema(schemas);
    Validator validator = schema.newValidator();

Looks like the only approach for now! Thanks for the snippet. — Ellis, Jan 24 '12 at 10:03

score 0 · Answer 2 · answered Jan 23 '12 at 21:58

0

There is not straight forward way for doing this. There is no open source library that I could find either. I used XML Pack tool in IBM Info sphere to do this. This does a fairly good job for importing wsdls and xsds and validating xml data or loading XML data and converting them to flat files. You may find this link useful: http://www.ibm.com/developerworks/data/library/techarticle/dm-1103datastages/index.html

answered Jan 23 '12 at 21:58

codegenx

23
1
8

Thanks for the reply, although I don't think this will fly given that what I'm attempting to do here is simplify a utility which currently uses a full blown framework to validate a SOAP message – Ellis Jan 23 '12 at 22:03
This is a library that we have used: http://www.ibm.com/developerworks/xml/library/x-javaxmlvalidapi/index.html in our current implementation. – codegenx Jan 23 '12 at 22:41
I don't see anything about validating against a WSDL on that page. – Ellis Jan 24 '12 at 10:02

Validating SOAP message against WSDL with multiple XSD's

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