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From "Simone Tripodi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DIGESTER-173) No way to enable schema validation from DigesterLoader
Date Fri, 21 Dec 2012 20:53:13 GMT

    [ https://issues.apache.org/jira/browse/DIGESTER-173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538402#comment-13538402
] 

Simone Tripodi commented on DIGESTER-173:
-----------------------------------------

Hi Ivan,

I committed your patch with some trivial modifications - see r1425132:

 * the better way to test against expected exceptions, is specifying them in the {{@Test}}
annotation, i.e. {{@Test( expected = SAXParseException.class )}}

 * the default {{ErrorHandler}} just log exceptions, don't throw them, so I in the test I
added an anonymous implementation that just rethrows the caught exception;

 * for test classes, the {{*TetsCase}} suffix is preferred.

Anyway, there are no tests for {{setFeature()}} method in {{DigesterLoader}}, so I don't close
the issue until we'll have them.
Are you in the position of submitting another patch about it?

TIA and thanks a lot for contributing!
                
> No way to enable schema validation from DigesterLoader
> ------------------------------------------------------
>
>                 Key: DIGESTER-173
>                 URL: https://issues.apache.org/jira/browse/DIGESTER-173
>             Project: Commons Digester
>          Issue Type: Improvement
>    Affects Versions: 3.2
>            Reporter: Nick Williams
>            Assignee: Simone Tripodi
>            Priority: Critical
>         Attachments: LoaderDTDValidation.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> It's possible that I'm using DigesterLoader with the improper assumptions, but my belief
is that it is meant to be a factor of sorts for creating Digesters. If this is the case, the
DigesterLoader interface is incomplete (and, for that matter, even if it is not the case,
the documentation surrounding the use of Digester and DigesterLoader is seriously lacking).
> I originally used the following code to digest my XML files:
> {code}this.loader = DigesterLoader.newLoader(module);
> this.loader.setNamespaceAware(true);
> this.loader.setSchema(schema);
> this.loader.setValidating(true);
> this.loader.setErrorHandler(new DefaultThrowingErrorHandler());
> this.loader.setUseContextClassLoader(false);
> this.loader.setClassLoader(Digester.class.getClassLoader());
> ...
> this.loader.newDigester().parse(myFile);{code}
> However, I was getting strange errors "Document is invalid: no grammar found" and "must
match DOCTYPE root null". Since I wasn't using a DOCTYPE, I had no idea why this was happening.
Much Googling of other sources (the documentation did not help me with this) finally made
me realize that setValidating() was turning on DTD validating, regardless of the fact that
I was actually using schemas.
> I finally figured out my code needed to be this:
> {code}this.loader = DigesterLoader.newLoader(module);
> this.loader.setNamespaceAware(true);
> this.loader.setSchema(schema);
> this.loader.setErrorHandler(new DefaultThrowingErrorHandler());
> this.loader.setUseContextClassLoader(false);
> this.loader.setClassLoader(Digester.class.getClassLoader());
> ...
> Digester digester = this.loader.newDigester();
> digester.setFeature("http://xml.org/sax/features/validation", true);
> digester.setFeature("http://apache.org/xml/features/validation/schema", true);
> digester.setFeature("http://apache.org/xml/features/validation/schema-full-checking",
true);{code}
> As you can see, I have to first get a Digester from the factory and THEN configure the
digester further before I can use it. This is contrary to the standard factory pattern.
> *Proposal 1*
> - Deprecate setValidating(boolean) in DigesterLoader and Digester and replace them with
setDoctypeValidating(boolean).
> - Add a setSchemaValidating(boolean) method to DigesterLoader and Digester.
> - Add a setFeature() method in DigesterLoader to mirror the one in Digester.
> *Proposal 2*
> - Document the setValidating(boolean) DigesterLoader and Digester methods better to indicate
that it is for DOCTYPE validation and should not be used when using schemas.
> - Add a setFeature() method in DigesterLoader to mirror the one in Digester.

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