[英]MOXy exception with XmlAdapter and JSON
我運行莫西2.5.0和得到一個ClassCastException
與XmlAdapter
,而只是試圖輸出JSON時; XML輸出工作正常。
我有一個包裝器類,如下所示:
@XmlAccessorType(XmlAccessType.NONE)
public abstract class ListWrapper<T> implements List<T>
{
private List<T> list = new ArrayList<T>();
@XmlElement
private Foo foo; // stuff specific to my problem domain
public ListWrapper()
{
}
public ListWrapper(Foo foo, List list)
{
this.foo = foo;
this.list = list;
}
// ... implementation of List<T> using the list member ...
}
該類的后代如下所示:
@XmlRootElement(name = "recordList")
@XmlAccessorType(XmlAccessType.NONE)
public class RecordList extends ListWrapper<Record>
{
public RecordList()
{
super();
}
public RecordList(Foo foo, List<Record> list)
{
super(foo, list);
}
@Override
@XmlElementWrapper(name = "records")
@XmlElement(name = "record", type = Record.class)
public List<Record> getList()
{
return super.getList();
}
}
然后有一個RecordList
的XmlAdapter看起來像這樣:
public class RecordListAdapter extends XmlAdapter<RecordList, RecordList>
{
@Override
public RecordList unmarshal(RecordList v) throws Exception
{
return v;
}
@Override
public RecordList marshal(RecordList v) throws Exception
{
return v;
}
}
最后是一個包含RecordList
類的成員的類,並按如下方式聲明它們:
@XmlRootElement(name = "container")
@XmlAccessorType(XmlAccessType.NONE)
public class Container
{
@XmlElement
@XmlJavaTypeAdapter(RecordListAdapter.class)
protected RecordList recordList;
// ... other stuff ...
}
使用參考JAXB實現,在XML和JSON中都可以正常工作(我們將Jackson用作JSON邏輯)。 更改MOXy(並刪除Jackson)后,在請求JSON輸出時,將獲得類似於以下內容的異常跟蹤。
javax.xml.bind.MarshalException - with linked exception:[Exception [EclipseLink-25003] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred marshalling the object
Internal Exception: Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [1], of class [class com.example.Record], could not be converted to [class com.example.RecordList].
Internal Exception: java.lang.ClassCastException: com.example.Record cannot be cast to com.example.RecordList]
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:403)
...
Caused by: Exception [EclipseLink-25003] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred marshalling the object
Internal Exception: Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [1], of class [class com.example.Record], could not be converted to [class com.example.RecordList].
Internal Exception: java.lang.ClassCastException: com.example.Record cannot be cast to com.example.RecordList
at org.eclipse.persistence.exceptions.XMLMarshalException.marshalException(XMLMarshalException.java:97)
...
Caused by: Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [1], of class [class com.example.Record], could not be converted to [class com.example.RecordList].
Internal Exception: java.lang.ClassCastException: com.example.Record cannot be cast to com.example.RecordList
at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConverted(ConversionException.java:87)
...
Caused by: java.lang.ClassCastException: com.example.Record cannot be cast to com.example.RecordList
at com.example.RecordListAdapter.marshal(RecordListAdapter.java:5)
at org.eclipse.persistence.internal.jaxb.XMLJavaTypeConverter.convertObjectValueToDataValue(XMLJavaTypeConverter.java:172)
我不知道為什么MOXy試圖將Record
用作RecordList
,但是似乎就在發生這種情況。 就像我說的那樣,JAXB的引用(即Sun)實現不會發生這種情況。 它僅在我嘗試使用MOXy時發生。
這里有什么想法嗎? 謝謝。
刪除Jackson后,您將不再具有JSON的寫適配器。 您需要告訴服務器它應該如何產生JSON。
注意:我是EclipseLink JAXB(MOXy)的負責人,並且是JAXB(JSR-222)專家組的成員。
莫西和您正在使用其他技術之間的一個區別是,莫西將把RecordList
和ListWrapper
作為java.util.List
,因為它實現了java.util.List
。 因此,不能將XmlAdapter
應用於它,因為它只能應用於集合中的項目。
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