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https://issues.apache.org/jira/browse/AXIOM-497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837807#comment-16837807
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Andreas Veithen commented on AXIOM-497:
---------------------------------------
I can't reproduce this. This is more likely a problem with the StAX parser than
a bug in Axiom. In particular, the StAX implementation in Weblogic is known to
have issues and because it's not Open Source, it's not well tested with Axiom.
Please add the Woodstox StAX implementation to your project and try again. If
the problem persists please provide a self-contained test project to reproduce
the issue.
> Removal of namespace declaration breaks type attribute
> ------------------------------------------------------
>
> Key: AXIOM-497
> URL: https://issues.apache.org/jira/browse/AXIOM-497
> Project: Axiom
> Issue Type: Bug
> Components: Core Model, OM Mixins
> Affects Versions: 1.2.13
> Environment: Weblogic 12.2.1.3 version application server
> Reporter: Unifiers Pega
> Priority: Critical
>
> When the following XML is converted to an OMElement, then written back out,
> the namespace prefix used by the xsi:type attribute refers to the incorrect
> namespace URI. That is because the local prefix mapping used in the type name
> reference is removed from the element that contains the type attribute during
> parsing.
> It appears to be caused by a null return value from the getNsBuilder method
> of AttributeCollector when it thinks the namespace declaration is redundant.
> Original XML:
> <ns1:A xmlns:ns1="urn:foo">
> <ns1:B xmlns:ns1="urn:bar">
> <ns2:C xmlns:ns1="urn:foo" xmlns:ns2="urn:bar"
> xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance]"; xsi:type="ns1:TypeA"/>
> </ns1:B>
> </ns1:A>
> After conversion to OMElement, xsi:type name cannot be resolved because it is
> mapped to the wrong namespace URI:
> <ns1:A xmlns:ns1="urn:foo">
> <ns1:B xmlns:ns1="urn:bar">
> <ns2:C xmlns:ns2="urn:bar"
> xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance]"; xsi:type="ns1:TypeA"/>
> </ns1:B>
> </ns1:A>
>
> Here's some sample code to reproduce the issue:
> ```
> System.out.println("Before StAX parsing:\n"+xmlString);
> try {
> java.io.StringReader stringReader = new java.io.StringReader(xmlString);
> javax.xml.stream.XMLInputFactory inputFactory =
> javax.xml.stream.XMLInputFactory.newInstance();
> javax.xml.stream.XMLStreamReader streamReader =
> inputFactory.createXMLStreamReader(stringReader);
> org.apache.axiom.om.impl.builder.StAXOMBuilder builder = new
> org.apache.axiom.om.impl.builder.StAXOMBuilder(streamReader);
> xmlString = builder.getDocumentElement().toString();
> } catch (Exception e) {
> System.out.println("Caught exception " + e);
> }
> System.out.println("After StAX parsing:\n"+xmlString);
> ```
>
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