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From "Andreas Veithen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AXIOM-441) Unable to parse XML with empty default namespace attribute value with OpenJDK StAX implementation
Date Wed, 14 Nov 2012 10:52:12 GMT

    [ https://issues.apache.org/jira/browse/AXIOM-441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497020#comment-13497020
] 

Andreas Veithen commented on AXIOM-441:
---------------------------------------

The StAX specification indeed has lots of ambiguities and is of rather poor quality. At some
point I documented the ambiguities relevant for Axiom and how to handle them:

http://ws.apache.org/axiom/apidocs/org/apache/axiom/util/stax/dialect/StAXDialect.html

At the time I wrote that documentation, I actually came to the same conclusion as you:

[quote]An XML document may contain a namespace declaration such as xmlns="". In this case,
it is not clear if XMLStreamReader.getNamespaceURI(int) should return null or an empty string.[/quote]

Therefore the code in Axiom is expected to handle both situations, and this was indeed not
the case in StAXOMBuilder#processNamespaceData. This has been fixed now and I checked that
there are no other usages of the getNamespaceURI(int) method that have the same problem.
                
> Unable to parse XML with empty default namespace attribute value with OpenJDK StAX implementation
> -------------------------------------------------------------------------------------------------
>
>                 Key: AXIOM-441
>                 URL: https://issues.apache.org/jira/browse/AXIOM-441
>             Project: Axiom
>          Issue Type: Bug
>          Components: API, LLOM
>    Affects Versions: 1.2.13
>            Reporter: Paul Millar
>            Assignee: Andreas Veithen
>              Labels: patch
>             Fix For: 1.2.14
>
>         Attachments: patch-fix-StAXOMBuilder.diff
>
>
> From:
>     http://www.w3.org/TR/2009/REC-xml-names-20091208/
> "The attribute value in a default namespace declaration MAY be empty. This has the same
effect, within the scope of the declaration, of there being no default namespace."
> Here is a document that demonstrates this:
> <?xml version='1.0' encoding='UTF-8'?>
> <foo xmlns='http://example.org/'>
>     <bar xmlns=''>value</bar>
> </foo>
> The following code snippet (slightly modified from Axiom documentation) uses Axiom to
parse a String variable xmlData:
>         InputStream in =
>                 new ByteArrayInputStream(xmlData.getBytes(Charset.forName("UTF-8")));
>         OMXMLParserWrapper builder = OMXMLBuilderFactory.createOMBuilder(in);
>         OMElement documentElement = builder.getDocumentElement();
>         documentElement.serialize(System.out);
>         System.out.println();
> When given the above XML example, an IllegalArgumentException is thrown:
> Exception in thread "main" java.lang.IllegalArgumentException: Namespace URI may not
be null
> 	at  org.apache.axiom.om.impl.llom.OMNamespaceImpl.<init>(OMNamespaceImpl.java:38)
> 	at org.apache.axiom.om.impl.llom.OMElementImpl.addNamespaceDeclaration(OMElementImpl.java:430)
> 	at org.apache.axiom.om.impl.builder.StAXOMBuilder.processNamespaceData(StAXOMBuilder.java:608)
> 	at org.apache.axiom.om.impl.builder.StAXOMBuilder.populateOMElement(StAXOMBuilder.java:430)
> 	at org.apache.axiom.om.impl.builder.StAXOMBuilder.createOMElement(StAXOMBuilder.java:461)
> 	at org.apache.axiom.om.impl.builder.StAXOMBuilder.createNextOMElement(StAXOMBuilder.java:318)
> 	at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:249)
> 	at org.apache.axiom.om.impl.llom.OMElementImpl.buildNext(OMElementImpl.java:709)
> 	at org.apache.axiom.om.impl.llom.OMNodeImpl.getNextOMSibling(OMNodeImpl.java:121)
> 	at org.apache.axiom.om.impl.traverse.OMChildrenIterator.getNextNode(OMChildrenIterator.java:36)
> 	at org.apache.axiom.om.impl.traverse.OMAbstractIterator.hasNext(OMAbstractIterator.java:69)
> 	at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:555)
> 	at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
> 	at org.apache.axiom.om.impl.llom.OMSerializableImpl.serialize(OMSerializableImpl.java:120)
> 	at org.apache.axiom.om.impl.llom.OMSerializableImpl.serialize(OMSerializableImpl.java:108)
> 	at org.apache.axiom.om.impl.llom.OMSerializableImpl.serialize(OMSerializableImpl.java:127)
> This looks like a bug.
> Cheers,
> Paul.

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