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我正在編寫一個簡單的地理編碼應用程序，使用Jersey REST客戶端API，使用OpenStreetMap/Mapquest Nominatim REST服務。該調用返回一個類似的JSON響應：MOXY JAXB異常與「類型」字段處理爲子類辨別器
[ {
"place_id":"249137377",
"licence":"Data \u00a9 OpenStreetMap contributors, ODbL 1.0. http:\/\/www.openstreetmap.org\/copyright",
"boundingbox":["32.834854904644","32.834954904644","-79.243545952863","-79.243445952863"],
"lat":"32.8349049046436",
"lon":"-79.2434959528633",
"display_name":"9000, Maple Avenue, Bedford, Trimble County, Kentucky, 40006, United States of America",
"class":"place",
"type":"house",
"importance":0.521
} ]
正如你所看到的，它含有一種叫type場。雖然解編這個JSON響應，以下異常引發：
Caused by: Exception [EclipseLink-43] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Missing class for indicator field value [house] of type [class java.lang.String].
Descriptor: XMLDescriptor(com.edc.c2c.geospatial.nominatim.v1.model.impl.NominatimResponse --> [])
at org.eclipse.persistence.exceptions.DescriptorException.missingClassForIndicatorFieldValue(DescriptorException.java:940)
at org.eclipse.persistence.internal.oxm.QNameInheritancePolicy.classFromRow(QNameInheritancePolicy.java:266)
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.classFromRow(TreeObjectBuilder.java:182)
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.classFromRow(TreeObjectBuilder.java:1)
at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.initializeRecord(UnmarshalRecordImpl.java:502)
at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.startElement(UnmarshalRecordImpl.java:740)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:177)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:195)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:972)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:425)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:635)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:703)
at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:655)
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:301)
at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.readFrom(MOXyJsonProvider.java:597)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:188)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:134)
at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:988)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:833)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:768)
at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:96)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:761)
... 31 more
我猜測發生了誤差，因爲type被視爲一種類鑑別，並house被解釋爲一個子類，而不是一個簡單的串。
這是用於調用該服務的代碼：
public Coordinate lookup(StreetAddress a_StreetAddress)
{
LatLongCoordinate result = null ;
Client client = ClientBuilder.newClient() ;
client.register(MoxyXmlFeature.class) ;
WebTarget target = client.target(this.getEndPointUrl()) ;
NominatimResponse response =
target
.queryParam("q", a_StreetAddress.format()) // Buildup GET request
.queryParam("format", "json")
.queryParam("addressdetails", "0")
.queryParam("limit", "1")
.request(MediaType.APPLICATION_JSON_TYPE) // Only accept JSON back in response
.buildGet()
.invoke(NominatimResponse.class)
;
if ((response != null) && (response.getLatitude() != null) && (response.getLongitude() != null)) {
result = new LatLongCoordinate(response.getLatitude(), response.getLongitude()) ;
}
return result ;
}
這是NominatimResponse類我創建解組應答到：
public class NominatimResponse extends AbstractGeospatialModelObject
{
private static final long serialVersionUID = -7514888439468843335L ;
@XmlElement(name = "place_id")
private String m_PlaceId = null ;
@XmlElement(name = "license")
private String m_License = null ;
@XmlElement(name = "osm_type")
private String m_OsmType = null ;
@XmlElement(name = "osm_id")
private String m_OsmId = null ;
@XmlElement(name = "bounding_box")
private Double[] m_BoundingBox = null ;
@XmlElement(name = "lat")
private Double m_Latitude = null ;
@XmlElement(name = "lon")
private Double m_Longitude = null ;
@XmlElement(name = "display_name")
private String m_DisplayName = null ;
@XmlElement(name = "class")
private String m_Classifier = null ;
@XmlElement(name = "type")
private String m_Type = null ;
@XmlElement(name = "importance")
private Double m_Importance = null ;
/**
* @return the placeId
*/
public String getPlaceId()
{
return this.m_PlaceId ;
}
/**
* @param a_placeId the placeId to set
*/
public void setPlaceId(String a_placeId)
{
this.m_PlaceId = a_placeId ;
}
/**
* @return the license
*/
public String getLicense()
{
return this.m_License ;
}
/**
* @param a_license the license to set
*/
public void setLicense(String a_license)
{
this.m_License = a_license ;
}
/**
* @return the osmType
*/
public String getOsmType()
{
return this.m_OsmType ;
}
/**
* @param a_osmType the osmType to set
*/
public void setOsmType(String a_osmType)
{
this.m_OsmType = a_osmType ;
}
/**
* @return the osmId
*/
public String getOsmId()
{
return this.m_OsmId ;
}
/**
* @param a_osmId the osmId to set
*/
public void setOsmId(String a_osmId)
{
this.m_OsmId = a_osmId ;
}
/**
* @return the boundingBox
*/
public Double[] getBoundingBox()
{
return this.m_BoundingBox ;
}
/**
* @param a_boundingBox the boundingBox to set
*/
public void setBoundingBox(Double[] a_boundingBox)
{
this.m_BoundingBox = a_boundingBox ;
}
/**
* @return the latitude
*/
public Double getLatitude()
{
return this.m_Latitude ;
}
/**
* @param a_latitude the latitude to set
*/
public void setLatitude(Double a_latitude)
{
this.m_Latitude = a_latitude ;
}
/**
* @return the longitude
*/
public Double getLongitude()
{
return this.m_Longitude ;
}
/**
* @param a_longitude the longitude to set
*/
public void setLongitude(Double a_longitude)
{
this.m_Longitude = a_longitude ;
}
/**
* @return the displayName
*/
public String getDisplayName()
{
return this.m_DisplayName ;
}
/**
* @param a_displayName the displayName to set
*/
public void setDisplayName(String a_displayName)
{
this.m_DisplayName = a_displayName ;
}
/**
* @return the classifier
*/
public String getClassifier()
{
return this.m_Classifier ;
}
/**
* @param a_classifier the classifier to set
*/
public void setClassifier(String a_classifier)
{
this.m_Classifier = a_classifier ;
}
/**
* @return the type
*/
public String getType()
{
return this.m_Type ;
}
/**
* @param a_type the type to set
*/
public void setType(String a_type)
{
this.m_Type = a_type ;
}
/**
* @return the importance
*/
public Double getImportance()
{
return this.m_Importance ;
}
/**
* @param a_importance the importance to set
*/
public void setImportance(Double a_importance)
{
this.m_Importance = a_importance ;
}
}
有沒有一種方法，以防止莫西從治療type看起來是這樣嗎？似乎它需要與@XmlDiscriminatorNode等相反。
在此先感謝您的幫助。
感謝您的建議。我創建了一個替代解決方案（直接使用JsonObject的），並且拋棄了Moxy編組。下一次，我和傑克遜一起嘗試。 – 2015-01-07 22:18:49