XSD anytype and JAXB - xsd

I have an xsd definition (from www.tmforum.org ossj common api v1.5)
<element name="primaryKey" nillable="false">
<complexType mixed="false">
<complexContent mixed="false">
<extension base="anyType"/>
</complexContent>
</complexType>
</element>
and would like to generate an xml as follows
<ossj-co-v1-5:primaryKey>mykey</ossj-co-v1-5:primaryKey>
The PrimaryKey class generated from the xsd using xjc requires a DOM Element to be stored in a list (see the generated PrimaryKey class at the bottom". "myKey" here is a TextNode and since its not an DOM Element, it cannot be added to xjc generated PrimaryKey class. How should I proceed to get the required output?
Here is the PrimaryKey class generated from the xsd
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "", propOrder = {
"any"
})
public static class PrimaryKey {
#XmlAnyElement
protected List<Element> any;
#XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
public List<Element> getAny() {
if (any == null) {
any = new ArrayList<Element>();
}
return this.any;
}
public Map<QName, String> getOtherAttributes() {
return otherAttributes;
}
}

The following object models would work for your scenario. I'll try to dig up the approprate schema customizations to produce these object models.
Option #1
You could have your code look like the following. This would mean that the element "primaryKey" would cause the object PrimaryKey to be instantiated with the corresponding text content being set on the any property.
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "", propOrder = {"any" })
public static class PrimaryKey {
#XmlValue
protected String any;
#XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
public List<Element> getAny() {
if (any == null) {
any = new ArrayList<Element>();
}
return this.any;
}
public Map<QName, String> getOtherAttributes() {
return otherAttributes;
}
}
Option #2
If you want an outer object to have a String property corresponding to the primaryKey you could do the following:
#XmlAccessorType(XmlAccessType.FIELD)
public class Root {
// #XmlElement is implied
private String primaryKey;
}

The Option#1 getAny() cannot return String as the signature returns List.
The Option#2 indeed works. Thanks!
Here is how my OSSJ code modification looks:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "ManagedEntityKey", propOrder = {
"applicationContext",
"applicationDN",
"type",
"primaryKey"
})
public class ManagedEntityKey {
#XmlElement(required = true)
protected String primaryKey;
//protected ManagedEntityKey.PrimaryKey primaryKey;
And ofcourse the signature of the setters and getters should be modified.

Related

Weird XmlMixed XML <-> JAXB <-> JSON marshalling/unmarshalling with MOXy

I have following type, defined in schema as:
<xsd:complexType name="any_t" mixed="true">
<xsd:sequence>
<xsd:any processContents="lax" minOccurs="0" maxOccurs="unbounded"></xsd:any>
</xsd:sequence>
</xsd:complexType>
Generated JAXB class:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "any_t", propOrder = {
"content"
})
public class AnyT implements Serializable
{
private final static long serialVersionUID = 1L;
#XmlMixed
#XmlAnyElement(lax = true)
protected List<Object> content;
public List<Object> getContent() {
if (content == null) {
content = new ArrayList<Object>();
}
return this.content;
}
}
Some JAXB class that uses this type:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "", propOrder = {
"addInfo"
})
#XmlRootElement(name = "FORM_OF_COOWNERS")
public class FormOfCoowners
implements Serializable
{
private final static long serialVersionUID = 1L;
#XmlElement(name = "add_info")
protected AnyT addInfo;
public AnyT getAddInfo() { return addInfo; }
public void setAddInfo(AnyT value) { this.addInfo = value; }
}
When I unmarshall this XML to JAXB object:
<FORM_OF_COOWNERS>
<add_info>
<info_analytics>
<issuer_subdiv>
<id><id>1940001</id></id>
</issuer_subdiv>
<fl_worker>Yes</fl_worker>
</info_analytics>
</add_info>
</FORM_OF_COOWNERS>
and marshall this object to JSON, I get:
{"FORM_OF_COOWNERS":{"add_info":{"info_analytics":[{"issuer_subdiv":{"id":{"id":"1940001"}},"fl_worker":"Yes"}]}}}
where does this list came from? info_analytics maps to a type without any collections/arrays.
If I get this JSON, umarshall it to JAXB object and marshall to XML, it produces:
<info_analytics fl_worker="Yes">
<issuer_subdiv>
<id id="1940001">
<id>1940001</id>
</id>
</issuer_subdiv>
<fl_worker>Yes</fl_worker>
</info_analytics>
why elements are duplicated as attributes?
UPDATE: marshalling/unmarshalling to/from json:
def unmarshallToJaxbTyped[A : ClassTag](json: String): Throwable \/ A =
\/.fromTryCatchNonFatal {
val cls = classTag[A].runtimeClass
val jc = JAXBContext.newInstance(cls)
val unmarshaller = jc.createUnmarshaller()
unmarshaller.setProperty("eclipselink.media-type", "application/json")
unmarshaller.unmarshal(new StreamSource(new StringReader(json)), cls)
.getValue.asInstanceOf[A]
}
def marshallJaxbToJson(obj: Any): Throwable \/ String =
\/.fromTryCatchNonFatal {
val jc = JAXBContext.newInstance(obj.getClass)
val marshaller = jc.createMarshaller()
marshaller.setProperty("eclipselink.media-type", "application/json")
val writer = new StringWriter()
marshaller.marshal(obj, writer)
writer.getBuffer.toString
}
xml:
protected static synchronized JAXBContext getContext() {
if (jaxbContext == null)
try {
jaxbContext = JAXBContext.newInstance("org.example.models");
} catch (JAXBException ex) {
throw new RuntimeException(ex);
}
return jaxbContext;
}
public static void saveMessage(Object msg, OutputStream os) throws JAXBException {
Marshaller marshaller = getContext().createMarshaller();
marshaller.marshal(msg, os);
}
public static Object loadMessage(InputStream is) throws JAXBException {
Unmarshaller unmarshaller = getContext().createUnmarshaller();
return unmarshaller.unmarshal(is);
}
I'm not sure how ofter such weird roundtrip: XML -> Java -> JSON -> Java -> XML is needed. I think you understand, that XML supports much more features than JSON and that's why it's not always possible to have 1 to 1 mapping.
If this is a real problem for you and not only theoretical investigations please fire a bug against MOXy: https://bugs.eclipse.org/bugs/enter_bug.cgi?product=EclipseLink

#XmlPath(".") conflicts with #XmlAdapter

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
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
After trying a lot of things, I was able to find a workaround for this issue. I thought of posting here the same so it can be helpful to someone else in the future. The lead has confirmed the issue around 5 years ago but seems like they have not fixed it and I was facing a similar issue.
Basically, we can use the beforeMarshal and afterUnmarshal methods to change the values in the fields.
You need to create a field List<Object> with #XmlAnyElement(lax=true) along with Map<String,Object>.
Remove the #XmlPath(".") and the XMLAdapter class.
Mark the field Map<String, Object> with #XmlTransient.
Now within the beforeMarshal and afterMarshal fields, you can exchange the data. During the unmarshal in beforeunmarshal, all the unknown field values will be present within the List<Object> loop over it and add it to the Map<String, Object>.
Similarly during the marshaling, you can move the values Map<String, Object> to List<Object> by creating the DOM elements.
Marshaling all values are added to root as DOM Elements are present and during Unmarshaling known values are read first and then-unknown values are stored within List<Object> due to #XmlAnyElement.
I have created an example using the Customer class, you can modify it accordingly for your need.
#JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, visible = true, property = "isA")
#JsonInclude(Include.NON_NULL)
#JsonIgnoreProperties(ignoreUnknown = true)
#XmlRootElement(name = "Customer")
#XmlType(name = "Customer", propOrder = {"name", "age", "otherElements"})
#XmlAccessorType(XmlAccessType.FIELD)
#Getter
#Setter
#AllArgsConstructor
#ToString
#NoArgsConstructor
public class Customer {
#XmlTransient
private String isA;
private String name;
private String age;
#XmlAnyElement(lax = true)
#JsonIgnore
private List<Object> otherElements = new ArrayList<>();
#JsonIgnore
#XmlTransient
private Map<String, Object> userExtensions = new HashMap<>();
#JsonAnyGetter
#JsonSerialize(using = CustomExtensionsSerializer.class)
public Map<String, Object> getUserExtensions() {
return userExtensions;
}
#JsonAnySetter
public void setUserExtensions(String key, Object value) {
userExtensions.put(key, value);
}
private void beforeMarshal(Marshaller m) throws ParserConfigurationException {
System.out.println("Before Marshalling User Extension: " + userExtensions);
ExtensionsModifier extensionsModifier = new ExtensionsModifier();
otherElements = extensionsModifier.Marshalling(userExtensions);
System.out.println("Before Marshalling Final Other Elements " + otherElements);
userExtensions = new HashMap<>();
}
private void afterUnmarshal(Unmarshaller m, Object parent) throws ParserConfigurationException {
System.out.println("After Unmarshalling : " + otherElements);
ExtensionsModifier extensionsModifier = new ExtensionsModifier();
userExtensions = extensionsModifier.Unmarshalling(otherElements);
otherElements = new ArrayList();
}
}
You can refer the creation of DOM ELEMENTS here:https://stackoverflow.com/a/24239105/7584240
You can refer my complete answer here: https://stackoverflow.com/a/67923216/7584240

JAXB Marshalling: Creating an empty element with an attribute

I use a JAXB marshaller and I would like to add an empty element with a specific attribute. This is a dummy class:
#XmlRootElement(name="observation")
public class Observation {
#XmlAttribute
public static final String classCode = "OBS";
#XmlAttribute
public static final String moodCode = "EVN";
private String data;
#XmlElement
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
This creates the following XML:
<observation classCode="OBS" moodCode="EVN">
<data>fsdfsdfd</data>
</observation>
Is there any way to add a new element with a specific attribute only (no value at all)? E.g.
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.113883.10.20.1.31"/>
<data>fsdfsdfd</data>
</observation>
This should do it:
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "TemplateIdType")
public class TemplateIdType {
#XmlAttribute(name = "root")
protected String root;
// getter and setter
}
(And you add an element of this class to Observation.)

JAXB and inheritance

I am trying to read a JSON file like:
{
"a": "abc",
"data" : {
"type" : 1,
...
}
}
where the ... part is replaceable based on the type like:
{
"a": "abc",
"data" : {
"type" : 1,
"b" : "bcd"
}
}
or:
{
"a": "abc",
"data" : {
"type" : 2,
"c" : "cde",
"d" : "def",
}
}
For the life of me I cannot figure out the proper JAXB annotations/classes to use to make this happen.
I don't have an issue moving the type variable outside of the data block if needed.
I'm using Glassfish 3.1.2.2.
Edit:
Based on the code provided by Perception I did a quick attempt... doesn't work in glassfish though:
#JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type")
#JsonSubTypes(
{
#JsonSubTypes.Type(value = DataSubA.class, name = "1"),
#JsonSubTypes.Type(value = DataSubB.class, name = "2")
})
#XmlRootElement
public abstract class Data implements Serializable
{
private static final long serialVersionUID = 1L;
public Data()
{
super();
}
}
#XmlRootElement
#XmlAccessorType(XmlAccessType.NONE)
public class DataSubA
extends Data
{
private static final long serialVersionUID = 1L;
#XmlElement
private BigDecimal expenditure;
public DataSubA() {
super();
}
public DataSubA(final BigDecimal expenditure) {
super();
this.expenditure = expenditure;
}
#Override
public String toString() {
return String.format("%s[expenditure = %s]\n",
getClass().getSimpleName(), getExpenditure());
}
public BigDecimal getExpenditure() {
return expenditure;
}
public void setExpenditure(BigDecimal expenditure) {
this.expenditure = expenditure;
}
}
#XmlRootElement
#XmlAccessorType(XmlAccessType.NONE)
public class DataSubB
extends Data
{
private static final long serialVersionUID = 1L;
#XmlElement
private String name;
#XmlElement
private Integer age;
public DataSubB()
{
super();
}
public DataSubB(final String name, final Integer age)
{
super();
this.name = name;
this.age = age;
}
#Override
public String toString()
{
return String.format("%s[name = %s, age = %s]\n",
getClass().getSimpleName(), getName(), getAge());
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
#XmlRootElement
#XmlAccessorType(XmlAccessType.NONE)
public class DataWrapper
{
#XmlElement
private Data data;
public Data getData() {
return data;
}
public void setData(Data data) {
this.data = data;
}
}
And a simple POST that takes it in:
#Stateless
#Path("x")
public class Endpoint
{
#POST
#Consumes(
{
MediaType.APPLICATION_JSON,
})
#Produces(
{
MediaType.APPLICATION_JSON,
})
public String foo(final DataWrapper wrapper)
{
return ("yay");
}
}
When I pass in JSON like:
{
"data" :
{
"type" : 1,
"expenditure" : 1
}
}
I get a message like:
Can not construct instance of Data, problem: abstract types can only be instantiated with additional type information
at [Source: org.apache.catalina.connector.CoyoteInputStream#28b92ec1; line: 2, column: 5] (through reference chain: DataWrapper["data"])
On the DataClass add an #XmlSeeAlso annotation that specifies all of the subclasses:
#XmlRootElement
#XmlSeeAlso({DataSubA.class, DataSubB.class})
public abstract class Data implements Serializable {
Then on each of the subclasses use the #XmlType annotation to specify the type name.
#XmlType(name="1")
public class DataSubA extends Data {
UPDATE
Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.
The JAXB (JSR-222) specification doesn't cover JSON-binding. There are different ways JAX-RS allows you to specify JSON mapping via JAXB annotations:
A JAXB implementation plus a library like Jettison that converts StAX events to JSON (see: http://blog.bdoughan.com/2011/04/jaxb-and-json-via-jettison.html)
By leveraging a JAXB impl that offers a JSON-binding (see: http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html)
Leveraging a JSON-binding tool that offers support for some JAXB metadata (i.e Jackson).
Since your model doesn't seem to be reacting as expected to the annotations I'm guessing you are using scenario 3. Below I will demonstrate the solution as if you were using scenario 2.
DataWrapper
import javax.xml.bind.annotation.*;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class DataWrapper {
private String a;
private Data data;
}
Data
import javax.xml.bind.annotation.*;
#XmlAccessorType(XmlAccessType.FIELD)
#XmlSeeAlso({DataSubA.class, DataSubB.class})
public class Data {
}
DataSubA
import javax.xml.bind.annotation.XmlType;
#XmlType(name="1")
public class DataSubA extends Data {
private String b;
}
DataSubB
import javax.xml.bind.annotation.XmlType;
#XmlType(name="2")
public class DataSubB extends Data {
private String c;
private String d;
}
jaxb.properties
To specify MOXy as your JAXB provider you need to include a file called jaxb.properties in the same package as your domain model with the following entry (see: http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html):
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
Demo
import java.util.*;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;
import org.eclipse.persistence.jaxb.JAXBContextProperties;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>();
properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);
JAXBContext jc = JAXBContext.newInstance(new Class[] {DataWrapper.class}, properties);
Unmarshaller unmarshaller = jc.createUnmarshaller();
StreamSource json = new StreamSource("src/forum16429717/input.json");
DataWrapper dataWrapper = unmarshaller.unmarshal(json, DataWrapper.class).getValue();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(dataWrapper, System.out);
}
}
input.json/Output
MOXy can read in the numeric value 2 as the inheritance indicator, but currently it will always write it out as "2". I have opened the following enhancement request to address this issue: http://bugs.eclipse.org/407528.
{
"a" : "abc",
"data" : {
"type" : "2",
"c" : "cde",
"d" : "def"
}
}
For More Information
The following link will help you use MOXy in a JAX-RS implementation.
http://blog.bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html

Use XmlIDRef for reference to abstract class

First of all a small example. The class ReferencingEntity holds a reference to the abstract class AbstractEntity. There are two implementations fo this class:
#XmlRootElement
public abstract class AbstractEntity {
#XmlID
private String id;
}
#XmlRootElement
public class EntityImpl1 extends AbstractEntity {
}
#XmlRootElement
public class EntityImpl2 extends AbstractEntity {
}
#XmlRootElement
public class ReferencingEntity {
#XmlIDREF
private AbstractEntity entity;
}
There is no problem marshalling an instance of ReferencingEntity (except that the concrete type is not present in xml), but when trying to unmarshal the xml representation, the descriptor is missing to determine the concrete implementation.
Currently I'm using an XmlAdapter to set all non-id fields null, but it would be better to use #XmlID if possible. Any ideas?
UPDATE:
I'm using RESTEasy in JBoss 6.1.0.Final and the provider creates the context as follows:
ContextResolver<JAXBContextFinder> resolver = providers.getContextResolver(JAXBContextFinder.class, mediaType);
JAXBContextFinder finder = resolver.getContext(type);
if (finder == null)
{
if (reader) throw new JAXBUnmarshalException("Could not find JAXBContextFinder for media type: " + mediaType);
else throw new JAXBMarshalException("Could not find JAXBContextFinder for media type: " + mediaType);
}
JAXBContext context = finder.findCachedContext(type, mediaType, annotations);
Below is my initial answer to your question. I imagine it will evolve as I better understand your use case.
ABOUT #XmlID/#XmlIDREF
Every instance referenced from a field/property annotated with #XmlIDREF also needs to be referenced via containment. I'll use the class below in this example.
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
public class Root {
private AbstractEntity abstractEntity;
private ReferencingEntity referencingEntity;
public AbstractEntity getAbstractEntity() {
return abstractEntity;
}
public void setAbstractEntity(AbstractEntity abstractEntity) {
this.abstractEntity = abstractEntity;
}
public ReferencingEntity getReferencingEntity() {
return referencingEntity;
}
public void setReferencingEntity(ReferencingEntity referencingEntity) {
this.referencingEntity = referencingEntity;
}
}
REGARDING INHERITANCE
JAXB (JSR-222) implementations can't automatically discover subclasses, so you will need to be sure that the JAXBContext is aware of them. One way to accomplish this is to use the #XmlSeeAlso annotation on the parent class to point at the child classes.
import javax.xml.bind.annotation.*;
#XmlSeeAlso({EntityImpl1.class, EntityImpl2.class})
#XmlAccessorType(XmlAccessType.FIELD)
public abstract class AbstractEntity {
#XmlID
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
DEMO CODE
Demo
package forum12111815;
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Root.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum12111815/input.xml");
Root root = (Root) unmarshaller.unmarshal(xml);
System.out.println(root.getAbstractEntity().getClass());
System.out.println(root.getAbstractEntity() == root.getReferencingEntity().getEntity());
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}
input.xml
<?xml version="1.0" encoding="UTF-8"?>
<root>
<abstractEntity xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="entityImpl2">
<id>123</id>
</abstractEntity>
<referencingEntity>
<entity>123</entity>
</referencingEntity>
</root>
Output
class forum12111815.EntityImpl2
true
<?xml version="1.0" encoding="UTF-8"?>
<root>
<abstractEntity xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="entityImpl2">
<id>123</id>
</abstractEntity>
<referencingEntity>
<entity>123</entity>
</referencingEntity>
</root>
FOR MORE INFORMATION
http://blog.bdoughan.com/2010/10/jaxb-and-shared-references-xmlid-and.html
http://blog.bdoughan.com/2010/11/jaxb-and-inheritance-using-xsitype.html

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