Yes, and you set a few properties in castor.properties to
configure the underlying XML parser (to enable validation). Other than that,
just make sure that your XMl document instances use namespaces, and that you
somehow provide a schema location.
Regards
Werner
Sorry- I meant to send that to Stephen Bash. He had said:
From: nadav steindler [mailto:[EMAIL PROTECTED]
Sent: Dienstag, 14. November 2006 13:11
To: [email protected]
Subject: Re: [castor-user] Fwd: Caster Unmarshalling Exception Handling
"You can have Castor do validation while it is parsing the file into Java objects. There's a how-to document online: http://castor.org/how-to-enable-xml-validation.html"
The document there gives an example without really explaining it much, but it uses a mapping file, so I assumed that it was an essential part to the validation. I take it it's not then.
How do you do validation then? You just run Unmarshal() with validate set to true?
On 11/14/06, Werner Guttmann < [EMAIL PROTECTED]> wrote:Sorry, but that question just does not make sense to me .. ;-(. How is the mapping file related to XMl schema validation ?Werner
From: nadav steindler [mailto:[EMAIL PROTECTED]]
Sent: Dienstag, 14. November 2006 12:01
To: [email protected]
Subject: Re: [castor-user] Fwd: Caster Unmarshalling Exception HandlingWait--so even though validation is set to true in the Unmarshaller, it's won't actually do it unless I make a mapping file, etc??
On 11/13/06, Stephen Bash <[EMAIL PROTECTED]> wrote:Nadav-
You can have Castor do validation while it is parsing the file into
Java objects. There's a how-to document online:
http://castor.org/how-to-enable-xml-validation.html
Unfortunately in my experience the validation exceptions aren't
particularly easy to read either, so I would suggest catching the
validation exception and attempting to get the useful information out
of them before printing/throwing a useful error message.
HTH,
Stephen
On 11/13/06, nadav steindler <[EMAIL PROTECTED]> 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]> 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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