This seems simple, but I must be missing something. All I am trying to do is unmarshall a JSON array. I have code that works when the JSON is a simple object, but when I make it an array (ie..surround JSON with []), it fails. Here is the sample json, domain class, unmarshalling code, and exception. Any help will be greatly appreciated.
Sample JSON:
[{"CreateIndex":24988,"ModifyIndex":132476,"LockIndex":0,"Key":"Redirector","Flags":0}
]
Domain:
package eclipselink.example.moxy.json.simple.model;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.google.common.base.Optional;
import com.google.common.io.BaseEncoding;
import com.orbitz.consul.model.kv.ImmutableValue;
import com.orbitz.consul.util.UnsignedLongDeserializer;
#org.immutables.value.Value.Immutable
#JsonDeserialize(as = ImmutableValue.class)
#JsonSerialize(as = ImmutableValue.class)
#JsonIgnoreProperties(ignoreUnknown = true)
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class MyValue {
#XmlAttribute
private long createIndex;
#XmlAttribute
private long modifyIndex;
#XmlAttribute
private long lockIndex;
#XmlAttribute
private String key;
#XmlElement
private long flags;
#XmlElement(nillable = true)
private Optional<String> value;
#XmlElement
private Optional<String> session;
#JsonProperty("CreateIndex")
public long getCreateIndex() {
return createIndex;
}
#JsonProperty("ModifyIndex")
public long getModifyIndex() {
return modifyIndex;
}
#JsonProperty("LockIndex")
public long getLockIndex() {
return lockIndex;
}
#JsonProperty("Key")
public String getKey() {
return key;
}
#JsonProperty("Flags")
#JsonDeserialize(using=UnsignedLongDeserializer.class)
public long getFlags() {
return flags;
}
#JsonProperty("Value")
public Optional<String> getValue() {
return value;
}
#JsonProperty("Session")
public Optional<String> getSession() {
return session;
}
#JsonIgnore
#org.immutables.value.Value.Lazy
public Optional<String> getValueAsString() {
if (getValue() != null && getValue().isPresent()) {
return Optional.of(
new String(BaseEncoding.base64().decode(getValue().get()))
);
} else {
return Optional.absent();
}
}
}
Unmarshall code:
public class Main_JSON_redirector {
private static final String INPUT_XML = "META-INF/input.xml";
private static final String INPUT_JSON_URL = "http://192.168.85.186:8500/v1/kv/Redirector";
private static final File INPUT_JSON_FILE = new File("C:/Users/dnance/EclipseLink-examples/moxy/json-simple/src/main/resources/META-INF/redirector.json");
public static void main(String[] args) throws Exception {
System.out.println();
System.out.println("Running EclipseLink MOXy Simple MAIN_JSON Example");
Map<String, Object> properties = new HashMap<String, Object>();
properties.put(JAXBContextProperties.JSON_WRAPPER_AS_ARRAY_NAME, true);
JAXBContext jc = JAXBContext.newInstance(new Class[] {MyValue.class}, properties);
Unmarshaller unmarshaller = jc.createUnmarshaller();
unmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, MediaType.APPLICATION_JSON);
unmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, false);
StreamSource source = new StreamSource(INPUT_JSON_FILE);
JAXBElement<MyValue[]> jaxbElement = unmarshaller.unmarshal(source, MyValue[].class);
MyValue[] value = jaxbElement.getValue();
System.out.println("value: " + value[0].getValueAsString());
...
Exception:
Running EclipseLink MOXy Simple MAIN_JSON Example
Exception in thread "main" javax.xml.bind.UnmarshalException
- with linked exception:
[Exception [EclipseLink-25007] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: A descriptor for class [Leclipselink.example.moxy.json.simple.model.MyValue; was not found in the project. For JAXB, if the JAXBContext was bootstrapped using TypeMappingInfo[] you must call a marshal method that accepts TypeMappingInfo as an input parameter.]
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.handleXMLMarshalException(JAXBUnmarshaller.java:1072)
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:341)
at eclipselink.example.moxy.json.simple.Main_JSON_redirector.main(Main_JSON_redirector.java:58)
Caused by: Exception [EclipseLink-25007] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: A descriptor for class [Leclipselink.example.moxy.json.simple.model.MyValue; was not found in the project. For JAXB, if the JAXBContext was bootstrapped using TypeMappingInfo[] you must call a marshal method that accepts TypeMappingInfo as an input parameter.
at org.eclipse.persistence.exceptions.XMLMarshalException.descriptorNotFoundInProject(XMLMarshalException.java:154)
at org.eclipse.persistence.internal.oxm.Context$ContextState.getSession(Context.java:137)
at org.eclipse.persistence.oxm.XMLContext$XMLContextState.getSession(XMLContext.java:798)
at org.eclipse.persistence.oxm.XMLContext$XMLContextState.getSession(XMLContext.java:1)
at org.eclipse.persistence.internal.oxm.Context.getSession(Context.java:458)
at org.eclipse.persistence.oxm.XMLContext.getSession(XMLContext.java:366)
at org.eclipse.persistence.oxm.XMLContext.getSession(XMLContext.java:1)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:837)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:710)
at org.eclipse.persistence.internal.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:643)
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:339)
You just need to specify type class instead of array class in unmarshal method, E.g.
Collection<MyValue> myValues = (Collection<MyValue>) unmarshaller.unmarshal(source, MyValue.class).getValue();
Since you have unmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, false); it just works. Without it unmarshal returns JAXBElement<Collection<JAXBElement>>.
Related
I am trying to create bean from string but unable to create as it is returning null.Here is my code
public ModelAndView checkPhotoQualityRequest(
#RequestBody String photoDataXml, HttpServletRequest request) {
PhotoQuality photoQuality = null;
try {
JAXBContext jaxbContext = JAXBContext
.newInstance(PhotoQuality.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
StringReader reader = new StringReader(photoDataXml);
photoQuality = (PhotoQuality) unmarshaller.unmarshal(reader);
PhotoQuality.java
package in.gov.uid.opencvaccess.bean;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
#XmlType(name = "PhotoQuality")
#XmlRootElement(name = "PhotoQuality")
public class PhotoQuality {
private String photoid;
private byte[] photo;
private boolean quality;
private String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getPhotoid() {
return photoid;
}
public void setPhotoid(String photoid) {
this.photoid = photoid;
}
public byte[] getPhoto() {
return photo;
}
public void setPhoto(byte[] photo) {
this.photo = photo;
}
public boolean isQuality() {
return quality;
}
public void setQuality(boolean quality) {
this.quality = quality;
}
}
Please help me to sort out this issue.When I debug and check bean its showing all null values but photoDataXml showing complete xml.
I have found the reason.When I tried using RESTClient its giving null object. But as soon as I written client code and passed StringWriter value created from PhotoQuality Object then it runs properly.
I have a class Person with attributes name and address. I display it in a XML. While unmarshalling from XML will it be possible to get line number for name and address separately.
I tried using Locator. But it does not provide individual line numbers.
The EclipseLink JAXB (MOXy) and the JAXB reference implementation each have their own #XmlLocation annotations for supporting this use case. This allows you to store the location on the XML element corresponding to the object as an instance of org.xml.sax.Locator. Since I'm the MOXy lead, I will demonstrate using MOXy:
Person
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import org.eclipse.persistence.oxm.annotations.XmlLocation;
import org.xml.sax.Locator;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Person {
#XmlJavaTypeAdapter(value=StringAdapter.class)
String name;
Address address;
#XmlLocation
Locator locator;
}
Address
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import org.eclipse.persistence.oxm.annotations.XmlLocation;
import org.xml.sax.Locator;
public class Address {
#XmlJavaTypeAdapter(value=StringAdapter.class)
private String street;
#XmlLocation
Locator locator;
}
StringAdapter
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import org.eclipse.persistence.oxm.annotations.XmlLocation;
import org.xml.sax.Locator;
public class StringAdapter extends XmlAdapter<StringAdapter.AdaptedString, String> {
public static class AdaptedString {
#XmlValue
public String value;
#XmlLocation
#XmlTransient
Locator locator;
}
#Override
public String unmarshal(AdaptedString v) throws Exception {
System.out.println(v.value + " " + v.locator.getLineNumber());
return v.value;
}
#Override
public AdaptedString marshal(String v) throws Exception {
AdaptedString adaptedString = new AdaptedString();
adaptedString.value = v;
return adaptedString;
}
}
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.
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
Demo
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Person.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum14455596/input.xml");
Person person = (Person) unmarshaller.unmarshal(xml);
System.out.println("Person: " + person.locator.getLineNumber());
System.out.println("Address: " + person.address.locator.getLineNumber());
}
}
Output
Jane Doe 3
1 A Street 5
Person: 2
Address: 4
You could leverage a StAX StreamReaderDelegate and do something like the following:
Demo
import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.stream.util.StreamReaderDelegate;
import javax.xml.transform.stream.StreamSource;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Person.class);
XMLInputFactory xif = XMLInputFactory.newFactory();
StreamSource source = new StreamSource("src/forum14455596/input.xml");
XMLStreamReader xsr = xif.createXMLStreamReader(source);
xsr = new StreamReaderDelegate(xsr) {
#Override
public String getLocalName() {
String localName = super.getLocalName();
if(isStartElement()) {
System.out.println(localName + " " + this.getLocation().getLineNumber());
}
return localName;
}
};
Unmarshaller unmarshaller = jc.createUnmarshaller();
unmarshaller.unmarshal(xsr);
}
}
Person
import javax.xml.bind.annotation.*;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Person {
private String name;
private String address;
}
input.xml
<?xml version="1.0" encoding="UTF-8"?>
<person>
<name>Jane Doe</name>
<address>1 A Street</address>
</person>
Output
person 2
name 3
address 4
Imagine I have enum defined like this:
public enum ArchiveStatus implements Serializable {
CANDIDATE (0, "CANDIDATE", "Candidate for archival"),
IN_LIBRARY (1, "IN-LIBRARY", ".."),
FROM_LIBRARY (2, "FROM-LIBRARY", "..");
private int id;
private String shortName;
private String longName;
public ArchiveStatus( int id, String shortName, String longName ) {
..
}
public int getId() { .. }
public String getShortName() { .. }
public String getLongName() { .. }
}
By default MOXy is going to serialize it to JSON like this:
{
..
"archiveStatus": "CANDIDATE",
..
}
Is there a way to configure MOXy (in the mapping file) to serialize the enum like a regular class:
{
..
"archiveStatus": { "id" : 0, "shortName": "CANDIDATE", "longName": "Candidate for archival" },
..
}
Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB 2 (JSR-222) expert group.
ArchiveStatusAdapter
You can solve this use case by leveraging an XmlAdapter. XmlAdapter is a JAXB mechanism that allows you to marshal one type of object as another.
package forum10144489;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public class ArchiveStatusAdapter extends XmlAdapter<ArchiveStatusAdapter.AdaptedArchiveStatus, ArchiveStatus> {
public static class AdaptedArchiveStatus {
public int id;
public String shortName;
public String longName;
}
#Override
public ArchiveStatus unmarshal(AdaptedArchiveStatus adaptedArchiveStatus) throws Exception {
if(null == adaptedArchiveStatus) {
return null;
}
return ArchiveStatus.valueOf(adaptedArchiveStatus.shortName);
}
#Override
public AdaptedArchiveStatus marshal(ArchiveStatus archiveStatus) throws Exception {
if(null == archiveStatus) {
return null;
}
AdaptedArchiveStatus adaptedArchiveStatus = new AdaptedArchiveStatus();
adaptedArchiveStatus.id = archiveStatus.getId();
adaptedArchiveStatus.longName = archiveStatus.getLongName();
adaptedArchiveStatus.shortName = archiveStatus.getShortName();
return adaptedArchiveStatus;
}
}
Root
The XmlAdapter can be specified at the field, property, type, or package level using the #XmlJavaTypeAdapter annotation.
package forum10144489;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
public class Root {
private ArchiveStatus archiveStatus;
#XmlJavaTypeAdapter(ArchiveStatusAdapter.class)
public ArchiveStatus getArchiveStatus() {
return archiveStatus;
}
public void setArchiveStatus(ArchiveStatus archiveStatus) {
this.archiveStatus = archiveStatus;
}
}
jaxb.properties
To specify MOXy as your JAXB provider you need to add a file called jaxb.properties in the same package as your domain classes with the following entry.
javax.xml.bind.context.factory = org.eclipse.persistence.jaxb.JAXBContextFactory
Demo
package forum10144489;
import java.io.StringReader;
import java.util.*;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>(2);
properties.put("eclipselink.media-type", "application/json");
properties.put("eclipselink.json.include-root", false);
JAXBContext jc = JAXBContext.newInstance(new Class[] {Root.class}, properties);
Unmarshaller unmarshaller = jc.createUnmarshaller();
StringReader jsonStringReader = new StringReader("{\"archiveStatus\" : {\"id\" : 0, \"shortName\" : \"CANDIDATE\", \"longName\" : \"Candidate for archival\"}}");
StreamSource jsonSource = new StreamSource(jsonStringReader);
Root root = unmarshaller.unmarshal(jsonSource, Root.class).getValue();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}
Output
Below is the output from running the demo code:
{
"archiveStatus" : {
"id" : 0,
"shortName" : "CANDIDATE",
"longName" : "Candidate for archival"
}
}
For More Information
http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html
http://blog.bdoughan.com/search/label/XmlAdapter
http://blog.bdoughan.com/search/label/jaxb.properties
I am trying to unmarshall an XML file using MOXy JAXB. I have a set of classes, already generated, and I am using Xpath to map every XML element I need into my model.
I have an XML file like this:
<?xml version="1.0" encoding="UTF-8"?>
<fe:Facturae xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
xmlns:fe="http://www.facturae.es/Facturae/2009/v3.2/Facturae">
<Parties>
<SellerParty>
<LegalEntity>
<CorporateName>Company Comp SA</CorporateName>
<TradeName>Comp</TradeName>
<ContactDetails>
<Telephone>917776665</Telephone>
<TeleFax>917776666</TeleFax>
<WebAddress>www.facturae.es</WebAddress>
<ElectronicMail>facturae#mityc.es</ElectronicMail>
<ContactPersons>Fernando</ContactPersons>
<CnoCnae>28000</CnoCnae>
<INETownCode>2134AAB</INETownCode>
<AdditionalContactDetails>Otros datos</AdditionalContactDetails>
</ContactDetails>
</LegalEntity>
</SellerParty>
<BuyerParty>
<Individual>
<Name>Juana</Name>
<FirstSurname>Mauriño</FirstSurname>
<OverseasAddress>
<Address>Juncal 1315</Address>
<PostCodeAndTown>00000 Buenos Aires</PostCodeAndTown>
<Province>Capital Federal</Province>
<CountryCode>ARG</CountryCode>
</OverseasAddress>
<ContactDetails>
<Telephone>00547775554</Telephone>
<TeleFax>00547775555</TeleFax>
</ContactDetails>
</Individual>
</BuyerParty>
</Parties>
</fe:Facturae>
Then I have my model:
#XmlRootElement(namespace="http://www.facturae.es/Facturae/2009/v3.2/Facturae", name="Facturae")
public class Facturae implements BaseObject, SecuredObject, CreationDataAware {
#XmlPath("Parties/SellerParty")
private Party sellerParty;
#XmlPath("Parties/BuyerParty")
private Party buyerParty;
}
public class Party implements BaseObject, SecuredObject, CreationDataAware {
#XmlPath("LegalEntity/ContactDetails")
private ContactDetails contactDetails;
}
As you can see, <ContactDetails></ContactDetails> is present in <SellerParty></SellerParty> and <BuyerParty></BuyerParty> but this two tags share the same JAVA object (Party). With the previous mapping (#XmlPath("LegalEntity/ContactDetails")) I can pass correctly the ContactDetails info in SellerParty, but I want also to pass the ContactDetails in <BuyerParty> at the same time.
I was trying something like that:
#XmlPaths(value = { #XmlPath("LegalEntity/ContactDetails"),#XmlPath("Individual/ContactDetails") })
private ContactDetails contactDetails;
but it doesn't work.
Can you guys give me a hand?
Thank you very much.
You could use an XmlAdapter for this use case:
PartyAdapter
We will use an XmlAdapter to convert an instance of Party to another type of object AdaptedParty. AdaptedParty will have two properties corresponding to each property in Party (one for each mapping possibility). We will take advantage of the ability to pre-initialize an instance of XmlAdapter to set an instance of Facturae on it. We will use the instance of Facturae to determine if the instance of Party we are handling is a sellerParty or a buyerParty.
package forum9807536;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import org.eclipse.persistence.oxm.annotations.XmlPath;
public class PartyAdapter extends XmlAdapter<PartyAdapter.AdaptedParty, Party> {
private Facturae facturae;
public PartyAdapter() {
}
public PartyAdapter(Facturae facturae) {
this.facturae = facturae;
}
#Override
public Party unmarshal(AdaptedParty v) throws Exception {
Party party = new Party();
if(v.individualName != null) {
party.setName(v.individualName);
party.setContactDetails(v.individualContactDetails);
} else {
party.setName(v.sellPartyName);
party.setContactDetails(v.sellerPartyContactDetails);
}
return party;
}
#Override
public AdaptedParty marshal(Party v) throws Exception {
AdaptedParty adaptedParty = new AdaptedParty();
if(null == facturae || facturae.getSellerParty() == v) {
adaptedParty.sellPartyName = v.getName();
adaptedParty.sellerPartyContactDetails = v.getContactDetails();
} else {
adaptedParty.individualName = v.getName();
adaptedParty.individualContactDetails = v.getContactDetails();
}
return adaptedParty;
}
public static class AdaptedParty {
#XmlPath("Individual/Name/text()")
public String individualName;
#XmlPath("Individual/ContactDetails")
public ContactDetails individualContactDetails;
#XmlPath("LegalEntity/CorporateName/text()")
public String sellPartyName;
#XmlPath("LegalEntity/ContactDetails")
public ContactDetails sellerPartyContactDetails;
}
}
Party
We will use the #XmlJavaTypeAdapter to associate the PartyAdapter to the Party class:
package forum9807536;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
#XmlJavaTypeAdapter(PartyAdapter.class)
public class Party implements BaseObject, SecuredObject, CreationDataAware {
private String name;
private ContactDetails contactDetails;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public ContactDetails getContactDetails() {
return contactDetails;
}
public void setContactDetails(ContactDetails contactDetails) {
this.contactDetails = contactDetails;
}
}
Demo
The following demo code demonstrates how to set a pre-initialized XmlAdapter on the Marshaller:
package forum9807536;
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Facturae.class);
File xml = new File("src/forum9807536/input.xml");
Unmarshaller unmarshaller = jc.createUnmarshaller();
Facturae facturae = (Facturae) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setAdapter(new PartyAdapter(facturae));
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(facturae, System.out);
}
}
Output
Below is the output from the demo code that corresponds to the portion of your model that I have mapped.
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Facturae xmlns:ns0="http://www.facturae.es/Facturae/2009/v3.2/Facturae">
<Parties>
<BuyerParty>
<Individual>
<Name>Juana</Name>
<ContactDetails/>
</Individual>
</BuyerParty>
<SellerParty>
<LegalEntity>
<CorporateName>Company Comp SA</CorporateName>
<ContactDetails/>
</LegalEntity>
</SellerParty>
</Parties>
</ns0:Facturae>
For More Information
http://blog.bdoughan.com/search/label/XmlAdapter
http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html
I am trying to make JAXB do not marshal empty tags when string is empty.
I can make it by creating XmlAdapter where insted empty string null would be returned. But in that way, I will have to annotate each attribute with this adapter.
Is there any way to make it more global?
EclipseLink JAXB (MOXy) will let you specify the XmlAdapter for java.lang.String at the package level (I'm the MOXy tech lead):
package-info
#XmlJavaTypeAdapter(value=StringAdapter.class, type=String.class)
package example;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
StringAdapter
package example;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public class StringAdapter extends XmlAdapter<String, String> {
#Override
public String unmarshal(String v) throws Exception {
return v;
}
#Override
public String marshal(String v) throws Exception {
if("".equals(v)) {
return null;
}
return v;
}
}
Root
package example;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
public class Root {
private String foo;
private String bar;
public String getFoo() {
return foo;
}
public void setFoo(String foo) {
this.foo = foo;
}
public String getBar() {
return bar;
}
public void setBar(String bar) {
this.bar = bar;
}
}
jaxb.properties
To use MOXy as your JAXB provider you need to include a file named jaxb.properties in the same package as your model classes with the following entry:
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
Demo
package example;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Root.class);
System.out.println(jc);
Root root = new Root();
root.setFoo("");
root.setBar("");
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}
Note
Due to what I feel is a bug in the JAXB reference implementation, the following exception is thrown if you use the version of JAXB included in Java SE 6:
Exception in thread "main" java.lang.NullPointerException
at com.sun.xml.bind.v2.runtime.output.Encoded.setEscape(Encoded.java:107)
at com.sun.xml.bind.v2.runtime.output.UTF8XmlOutput.doText(UTF8XmlOutput.java:315)
at com.sun.xml.bind.v2.runtime.output.UTF8XmlOutput.text(UTF8XmlOutput.java:299)
at com.sun.xml.bind.v2.runtime.output.IndentingUTF8XmlOutput.text(IndentingUTF8XmlOutput.java:153)
at com.sun.xml.bind.v2.runtime.XMLSerializer.leafElement(XMLSerializer.java:325)
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$1.writeLeafElement(RuntimeBuiltinLeafInfoImpl.java:210)
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$1.writeLeafElement(RuntimeBuiltinLeafInfoImpl.java:209)
at com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.writeLeafElement(TransducedAccessor.java:250)
at com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty.serializeBody(SingleElementLeafProperty.java:98)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:340)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:593)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:324)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:494)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:315)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:244)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:75)
at example.Demo.main(Demo.java:18)