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From "Paul Millar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AXIOM-441) Fails to parse XML with empty default namespace attribute value
Date Mon, 12 Nov 2012 16:17:15 GMT
Paul Millar created AXIOM-441:
---------------------------------

             Summary: Fails to parse XML with empty default namespace attribute value
                 Key: AXIOM-441
                 URL: https://issues.apache.org/jira/browse/AXIOM-441
             Project: Axiom
          Issue Type: Bug
          Components: LLOM
    Affects Versions: 1.2.13
            Reporter: Paul Millar
            Priority: Critical


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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