Help required - Failing to re-use XMLReader schema validation

[Huw Roberts <hu...@irisfinancial.com>]

Hi All,
I'm having some trouble re-using an XMLReader that I am asking to validate
some XML against a schema.
An example of the sort of code I'm using is as follows:
        //...
        XMLReader xmlReader =
XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");

xmlReader.setFeature("http://apache.org/xml/features/validation/schema",
true);
        xmlReader.setFeature("http://xml.org/sax/features/validation",
true);

xmlReader.setProperty("http://apache.org/xml/properties/schema/external-noNa
mespaceSchemaLocation", "/com/iris/csl/service/services.xsd");
        EntityResolver resolver = new
XmlElementUtil.JavaResourceEntityResolver(xmlReader.getClass().getClassLoade
r());
        xmlReader.setEntityResolver(resolver);
        ErrorHandler errorHandler = new XmlChecker.BasicErrorHandler();
        xmlReader.setErrorHandler(errorHandler);
        InputSource inputSource;
        System.out.println("parse one");
        inputSource = new InputSource(new StringReader("<CSLSystem/>"));
        xmlReader.parse(inputSource);
        System.out.println("parse two");
        inputSource = new InputSource(new StringReader("<CSLSystem/>"));
        xmlReader.parse(inputSource);

        //...

Interesting features of this code are:
1.  The XmlChecker.BasicErrorHandler simply prints errors/warnings/fatal to
stdout
2.  I get different error messages from the two calls to xmlReader.parse:
    parse one
    org.xml.sax.SAXParseException: cvc-complex-type.2.4.b: The content of
element 'CSLSystem' is not complete. One of '{"":type, "":configuration}' is
expected.
    parse two
    org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of
element 'CSLSystem'.
3.  I have a custom entity resolver which is only called during the first
call to parse.
4.  Is it conceivable that the problem might be in
org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar?
    It appears to call XMLSchemaLoader.resolveDocument only the first time,
yet it appears not to be able to find the schema declaration on subsequent
calls...?

Thanks all,
Huw

Re: Help required - Failing to re-use XMLReader schema validation

[Michael Glavassevich <mr...@ca.ibm.com>]

Hello Huw,

In Xerces 2.6.2 (probably dating back to 2.6.0) there was a bug [1] 
affecting the schema location properties which caused their values to be 
ignored on subsequent parses if the parser configuration isn't changed. 
The problem has been fixed in CVS.

[1] http://issues.apache.org/jira/browse/XERCESJ-994

"Huw Roberts" <hu...@irisfinancial.com> wrote on 12/22/2004 08:10:33 
PM:

> Hi All,
> I'm having some trouble re-using an XMLReader that I am asking to 
> validate some XML against a schema.
> An example of the sort of code I'm using is as follows:
>         //...
>         XMLReader xmlReader = XMLReaderFactory.createXMLReader("org.
> apache.xerces.parsers.SAXParser");
> xmlReader.setFeature("http://apache.org/xml/features/validation/schema
> ", true);
>         xmlReader.setFeature("http://xml.org/sax/features/validation", 
true);
>         xmlReader.setProperty("http://apache.
> org/xml/properties/schema/external-noNamespaceSchemaLocation", 
> "/com/iris/csl/service/services.xsd");
>         EntityResolver resolver = new XmlElementUtil.
> JavaResourceEntityResolver(xmlReader.getClass().getClassLoader());
>         xmlReader.setEntityResolver(resolver);
>         ErrorHandler errorHandler = new XmlChecker.BasicErrorHandler();
>         xmlReader.setErrorHandler(errorHandler);
>         InputSource inputSource;
>         System.out.println("parse one");
>         inputSource = new InputSource(new StringReader("<CSLSystem/>"));
>         xmlReader.parse(inputSource);
>         System.out.println("parse two");
>         inputSource = new InputSource(new StringReader("<CSLSystem/>"));
>         xmlReader.parse(inputSource);
>         //...
> 
> Interesting features of this code are:
> 1.  The XmlChecker.BasicErrorHandler simply prints 
> errors/warnings/fatal to stdout
> 2.  I get different error messages from the two calls to 
xmlReader.parse:
>     parse one
>     org.xml.sax.SAXParseException: cvc-complex-type.2.4.b: The 
> content of element 'CSLSystem' is not complete. One of '{"":type, 
> "":configuration}' is expected.
>     parse two
>     org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the 
> declaration of element 'CSLSystem'.
> 3.  I have a custom entity resolver which is only called during the 
> first call to parse.
> 4.  Is it conceivable that the problem might be in org.apache.
> xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar?
>     It appears to call XMLSchemaLoader.resolveDocument only the 
> first time, yet it appears not to be able to find the schema 
> declaration on subsequent calls...?
> 
> Thanks all,
> Huw
> 

Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org

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