Not sure which version of JAXP exposes it, but xerces definitely lets
you validate XML against a schema. The error messages can be a little
cryptic though.
James
nadav steindler wrote:
Hi James, thanks for the quick response.
So I have a W3C schema defined for the file.
Theoretically, I could just tell the systems engineer to validate the
file with XMLSpy, however the requirements for this project are that the
validation needs to be done by the java servlet I'm writing and that my
program needs to do the validation and print out clear error messages if
the xml file has problems. Are there any java libraries that do this?
Nadav
On 11/13/06, *James Abley* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Validate the XML first, using DTD, RELAX NG, W3C Schema or similar?
James
nadav steindler wrote:
>
> How do I parse an xml file and build a parse tree of caster-generated
> objects and get it to produce error messages a systems engineer can
> understand(short, with line numbers, with no reference to
internals of
> the code such as classes), rather than:
>
> "The following exception occured while validating field:
_firstVersion
> of class: com.nds.castorgenericformat.AMSGenericConversionFormat: The
> following exception occured while validating field:
> _firstVersionDefTypeHeader of class:
> com.nds.castorgenericformat.FirstVersion : The following exception
> occured while validating field: _headerTypeInput of class:
> com.nds.castorgenericformat.FirstVersionDefTypeHeader: The following
> exception occured while validating field:
> _groupOfSTBMessageFieldDefsList of class:
> com.nds.castorgenericformat.HeaderTypeInput: The following exception
> occured while validating field: _flagsByte of class:
> com.nds.castorgenericformat.GroupOfSTBMessageFieldDefs : The field
> '_name' (whose xml name is 'name') is a required field of class
> 'com.nds.castorgenericformat.FlagsByte"
>
>
> Which is what happens when I do:
>
> try
> {
> //Set up a Unmarshaller
> Unmarshaller unmarshaller = new
> Unmarshaller(AMSGenericConversionFormat.class);
>
> // Build parse tree from file
> AMSGenericConversionFormat genericFormat =
> (AMSGenericConversionFormat)unmarshaller.unmarshal(reader);
>
> }
> catch (MarshalException e1)
> {
> system.out.println(e1.getMessage());
> }
> catch (ValidationException e2)
> {
> system.out.println(e2.getMessage());
> }
>
>
>
>
> I'd rather get something like:
>
> "error line 52 in foo.xml, attribute "name" is missing"
>
>
>
>
> Thanks,
>
> Nadav
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