@XmlPath(".") 与 @XmlAdapter 冲突

本文介绍了@XmlPath(".") 与 @XmlAdapter 冲突的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

有了这个 Jaxb Xml 定义，我尝试通过添加 @XmlPath(".") 来删除 Map Elements Wrapper，但它在取消编组期间会导致异常

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;
    }
}

EventAdapter 是

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;
    }
    .....
}

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(".")

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

输出不错

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

但拆线失败

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 把我带到了这条线上

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);
}

entityType 值解组期间，UnmarshalRecordImpl.currentObj 包含 EventAdapter 而不是父元素

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

我修改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
    }
....
}

不是一个安全的解决方案

UnmarshalRecordImpl

@XmlPath(".") 与 @XmlAdapter 冲突

问题描述

推荐答案