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Re: [eclipselink-users] [MOXy] default namespace + inheritance + default root element doesn't work? 
Hi Polly,
This behaviour looks incorrect. I have entered the following bug for this issue: 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=253934

-Blaise

amphoras wrote:

Hi,

I have successfully unmarshalled classes using the default namespace +
inheritance or default namespace + default root element.  However, this is
the first time that I'm trying to combine default namespace + inheritance +
default root element.  This combination does not seem to work.  Please let
me know if I'm doing something wrong.

I have a class named Description that extends from Text.  I am using a
default namespace and making Description the default root element.  The
mapping looks like this:
<class-mapping-descriptor xsi:type="xml-class-mapping-descriptor"> <class>com.foo.Description</class> <alias>Description</alias> <inheritance xsi:type="qname-inheritance-policy"> <parent-class>com.foo.Text</parent-class> </inheritance> <events xsi:type="event-policy"/> <querying xsi:type="query-policy"/> <attribute-mappings> <attribute-mapping xsi:type="xml-direct-mapping"> <attribute-name>type</attribute-name> <field name="@type" xsi:type="node"/> </attribute-mapping> </attribute-mappings> <descriptor-type>aggregate</descriptor-type> <instantiation/> <copying xsi:type="instantiation-copy-policy"/> <default-root-element>Description</default-root-element> <default-root-element-field name="Description" xsi:type="node"> <leaf-element-type>DescriptionType</leaf-element-type> </default-root-element-field> <namespace-resolver> <namespaces/> <default-namespace-uri>http://www.foo.com/bar/baz</default-namespace-uri> </namespace-resolver> <schema xsi:type="schema-file-reference"> <schema-context>/DescriptionType</schema-context> <node-type>complex-type</node-type> </schema> </class-mapping-descriptor> 
The mapping for the superclass Text looks like:
<class-mapping-descriptor xsi:type="xml-class-mapping-descriptor"> <class>com.foo.Text</class> <alias>Text</alias> <inheritance xsi:type="qname-inheritance-policy"> <class-indicator-field name="@dummy" xsi:type="node"/> <class-indicator-mappings> <class-indicator-mapping> <class>com.foo.Description</class> <class-indicator xsi:type="xsd:string">DescriptionType</class-indicator> </class-indicator-mapping> <class-indicator-mapping> <class>com.foo.Text</class> <class-indicator xsi:type="xsd:string">TextType</class-indicator> </class-indicator-mapping> </class-indicator-mappings> </inheritance> <events xsi:type="event-policy"/> <querying xsi:type="query-policy"/> <attribute-mappings> <attribute-mapping xsi:type="xml-direct-mapping"> <attribute-name>value</attribute-name> <field name="text()" xsi:type="node"/> </attribute-mapping> <attribute-mapping xsi:type="xml-direct-mapping"> <attribute-name>languageID</attribute-name> <field name="@languageID" xsi:type="node"/> </attribute-mapping> </attribute-mappings> <descriptor-type>aggregate</descriptor-type> <instantiation/> <copying xsi:type="instantiation-copy-policy"/> <namespace-resolver> <namespaces/> <default-namespace-uri>http://www.foo.com/bar/baz</default-namespace-uri> </namespace-resolver> <schema xsi:type="schema-file-reference"> <schema-context>/TextType</schema-context> <node-type>complex-type</node-type> </schema> </class-mapping-descriptor> 
The test XML file does not have the "class-indicator-field" attribute
"dummy" because we will never get an XML file with that inside it.  I have
found that simply having the "class-indicator-mappings" has been enough for
nodes that are not a default root element.  However, since this class is a
default root element, the SAXUnmarshallerHandler.startElement finds the
"leafElementType" under the comment "no xsi:type attribute - look for type
indicator on the default root element".  The default root element is a QName
with the value "DescriptionType" but no namespace.  The code should be able
to "get the class from the inheritance policy", because the map contains: {class com.foo.Text=TextType, class com.foo.Description=DescriptionType, DescriptionType=class com.foo.Description, TextType=class com.foo.Text, {http://www.foo.com/bar/baz}TextType=class com.foo.Text, {http://www.foo.com/bar/baz}DescriptionType=class com.foo.Description} 

However, the problems appears to be that the QName type does not match the
key type of String.  So the class name cannot be retrieved, and I get an
exception:

Caused by: Exception [EclipseLink-43] (Eclipse Persistence Services - 1.0.1
(Build 20080905)): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Missing class for indicator field value
[DescriptionType] of type [class javax.xml.namespace.QName].
Descriptor: XMLDescriptor(com.foo.Description -->
[DatabaseTable(Description)])
	at
org.eclipse.persistence.exceptions.DescriptorException.missingClassForIndicatorFieldValue(DescriptorException.java:906)
	at
org.eclipse.persistence.internal.oxm.record.SAXUnmarshallerHandler.startElement(SAXUnmarshallerHandler.java:246)
	at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
Source)
...

It seems like the QName should either have the default namespace included or
a String should be used to do the matching.  However, if I'm doing something
wrong in my mapping, please let me know how I can fix it.

Thank you so much for your help!
--Polly

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