@XmlPath（“.”）与@XmlAdapter冲突

Question

有了这个Jaxb Xml定义，我尝试通过添加@xmlpath（“.”）来移除映射元素包装器，但在解压缩过程中会导致异常

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

EventAdapter是

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;
    }
    .....       
}

我的输出是

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

我尝试通过添加@xmlpath（“.”）来删除 标记

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

产量不错

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

但撤退失败了

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)

调试Jaxb使我熟悉了这一行

org.eclipse.persistence.internal.oxm.XMLDirectMappingNodeValue

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

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
    }
....
}

Answer 1

我已经能够重现你们看到的问题，但还没有找出原因。您可以使用以下bug来跟踪此问题的进展：

• http://bugs.eclipse.org/457169