jaxb - @XmlPath(".") conflicts with @XmlAdapter

Question

having this Jaxb Xml definition, i try to remove the Map Elements Wrapper by adding @XmlPath(".") but it cause exception during the unmarchaling

@XmlRootElement
public abstract class ViewElement{
    @XmlJavaTypeAdapter(value=EventAdapter.class)   
    public Map<Event, String> getEvents() {     
    }
    private transient Class entityType;
    public Class getEntityType() {
        return entityType;
    }
}

And the EventAdapter is

public class EventAdapter extends XmlAdapter<EventAdapter.AdaptedMap, Map<Event, String>> { 
    public static class AdaptedMap {
        @XmlVariableNode("key")
        List<AdaptedEntry> entries = new ArrayList<AdaptedEntry>();
    }
    public static class AdaptedEntry {
        @XmlTransient
        public String key;
        @XmlValue
        public String value;
    }
    .....       
}

my output was

<element>
   <events>
      <onCellEdit>do some thing<onCellEdit>
   </events>
   <entityType>com.agitech.erp.model.erp.ErpFolder</entityType>
<element>

I try to remove the <events> tag by adding @XmlPath(".")

@XmlPath(".")
@XmlJavaTypeAdapter(value=EventAdapter.class)   
public Map<Event, String> getEvents() {     
}

The output is good

<element>
   <onCellEdit>do some thing<onCellEdit>       
   <entityType>com.agitech.erp.model.erp.ErpFolder</entityType>
<element>

but the unmarchaling faileds

Caused by: Exception [EclipseLink-3002] (Eclipse Persistence Services - 2.6.0.v20140809-296a69f): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [], of class [class java.lang.String], from mapping [org.eclipse.persistence.oxm.mappings.XMLDirectMapping[entityType-->view.entityType/text()]] with descriptor [XMLDescriptor(com.agitech.erp.view.BeanView --> [DatabaseTable(view), DatabaseTable(viewFrame), DatabaseTable(viewElement)])], could not be converted to [class java.lang.Class].
Internal Exception: java.lang.ClassNotFoundException: 
    at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConvertedToClass(ConversionException.java:95)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:446)

Debuging Jaxb bring me to the line

org.eclipse.persistence.internal.oxm.XMLDirectMappingNodeValue

public void endElement(XPathFragment xPathFragment, UnmarshalRecord unmarshalRecord) {
    ...
    line 205 unmarshalRecord.setAttributeValue(convertedValue, xmlDirectMapping);
}

During the unmarchaling of entityType value, the UnmarshalRecordImpl.currentObj contains the EventAdapter instead of the parent element

I modify org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl

public XPathNode getNonAttributeXPathNode(String namespaceURI, String localName, String qName, Attributes attributes) {
....
    if(null == resultNode && null == nonPredicateNode) {
        // ANY MAPPING
        resultNode = xPathNode.getAnyNode();
// by default it return the EventAdapter, changing it to NULL fix my problem
    }
....
}

Not a safe solution

Answer 1

I have been able to reproduce the issue that you are seeing, but haven't yet worked out the cause. You can use the following bug to track the progress on this issue:

• http://bugs.eclipse.org/457169