Error in JAXB unMarshaller?

Error in JAXB unMarshaller? - java

i am getting the following while reading from my .xml file.here is the error
javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.dJohn.com/teacher", local:"teacher"). Expected elements are (none)
And here is my file.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Teacher xmlns="http://www.dJohn.com/teacher" Id="0001" />
main class
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
public class convertorDemo {
public static void main(String[] args) {
try {
File file = new File("C:\\file.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Teacher.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
Teacher mrS= (Teacher ) jaxbUnmarshaller.unmarshal(file);
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
and here is Teacher.java..leaving some other details
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "Teacher", propOrder = {
})
public class Teacher{
#XmlAttribute(name = "Id")
protected String Id;
public String getId() {
return Id;
}
public void setId(String value) {
this.Id = value;
}
}
I don't know what my problem is and i am new to JAXB.please help!!

Annotate your Tana class with XmlRootElement.

Related

JAXB - customize idref value

I would like to customize idrefs values and prepend a "#", like this simple example, where the friends attribute contains idrefs to Animal or Person elements.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
<Animal friends="#id1 #id2" id="id0"/>
<Animal friends="#id0" id="id1"/>
<Person friends="#id0" id="id2"/>
</root>
With Jaxb basic id/idref annotations I get this result (see my code below):
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
<Animal friends="id1 id2" id="id0"/>
<Animal friends="id0" id="id1"/>
<Person friends="id0" id="id2"/>
</root>
Is there a way to customize how the idref values are marshalled/unmarshalled?
My code
Test Class
package so;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class Test {
public static void main (String [] args) {
Root r = new Root();
Animal foo = new Animal("id0");
Animal bar = new Animal("id1");
Person gaz = new Person("id2");
foo.addFriend(bar);
foo.addFriend(gaz);
bar.addFriend(foo);
gaz.addFriend(foo);
r.addMember(foo);
r.addMember(bar);
r.addMember(gaz);
try {
JAXBContext jc = JAXBContext.newInstance(Root.class);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
marshaller.marshal(r, System.out);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Root.class
package so;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Root {
#XmlElements
({
#XmlElement(name = "Animal", type = Animal.class, required = false),
#XmlElement(name = "Person", type = Person.class, required = false)
})
private List<Friend> members;
public void addMember(Friend f) {
members.add(f);
}
public Root() {
members = new ArrayList<Friend>();
}
}
Person.class
package so;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlIDREF;
#XmlAccessorType(XmlAccessType.FIELD)
public class Person extends Friend {
#XmlAttribute
#XmlIDREF
private List<Friend> friends;
public Person(String id) {
super(id);
friends = new ArrayList<Friend>();
}
public void addFriend(Friend f) {
friends.add(f);
}
}
Animal class
package so;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlIDREF;
#XmlAccessorType(XmlAccessType.FIELD)
public class Person extends Friend {
#XmlAttribute
#XmlIDREF
private List<Friend> friends;
public Person(String id) {
super(id);
friends = new ArrayList<Friend>();
}
public void addFriend(Friend f) {
friends.add(f);
}
}
Friend class
package so;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlID;
import javax.xml.bind.annotation.XmlSeeAlso;
#XmlSeeAlso({Person.class, Animal.class})
#XmlAccessorType(XmlAccessType.FIELD)
public class Friend {
#XmlAttribute
#XmlID
private String id;
public Friend(String id) {
super();
this.id = id;
}
}

I need to marshal to XML I am getting duplicate values in my XML file

I have an object that I need to marshal to XML. To do this I am using JAXB. The resulting XML file is created, however,
I am getting duplicate values in my XML file I don't know why I am getting this please chek the output XML file
The following is Customer class for customer objects
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name = "Customer")
public class JaxBExample {
int id;
String name;
int age;
//SETTERS AND GETTERS
public int getId() {
return id;
}
#XmlAttribute
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
#XmlElement
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
#XmlElement
public void setAge(int age) {
this.age = age;
}
#Override
public String toString() {
return "JaxBExample [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
This Class is for List to make object list of customer
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name = "Customers")
#XmlAccessorType (XmlAccessType.FIELD)
public class TestList implements Serializable {
private List<JaxBExample> Customers=null;
public List<JaxBExample> getCustomers() {
return Customers;
}
#XmlElement
public void setCustomers(List<JaxBExample> customers) {
Customers = customers;
}
#Override
public String toString() {
return "TestList [Customers=" + Customers + "]";
}
}
Marshalling class to convert object to XML
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
public class ConvertObj2XML {
public static void main(String args[]){
JaxBExample customer=new JaxBExample();
customer.setId(1);
customer.setName("Raghava");
customer.setAge(26);
System.out.println("OBJ "+customer);
JaxBExample customer1=new JaxBExample();
customer1.setId(2);
customer1.setName("mani");
customer1.setAge(26);
System.out.println("OBJ "+customer1);
List<JaxBExample> customerLst=new ArrayList<JaxBExample>();
customerLst.add(customer);
customerLst.add(customer1);
TestList customers=new TestList();
customers.setCustomers(customerLst);
System.out.println(customers.toString());
try {
File file = new File("E:\\file.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(TestList.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(customers, file);
jaxbMarshaller.marshal(customers, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
I am getting duplicate values in my XML file I don't know why I am getting this please check the output XML file
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Customers>
<Customers id="1">
<age>26</age>
<name>Raghava</name>
</Customers>
<Customers id="2">
<age>26</age>
<name>mani</name>
</Customers>
<customers id="1">
<age>26</age>
<name>Raghava</name>
</customers>
<customers id="2">
<age>26</age>
<name>mani</name>
</customers>
</Customers>
can anyone help me out in this case?

The XmlAccessorType should be set to None as below
#XmlAccessorType (XmlAccessType.NONE)
According to documentation
None of the fields or properties is bound to XML unless they are specifically annotated with some of the JAXB annotations.
I have made the change and run the code and it is working as expected.
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name = "Customer")
public class JaxBExample {
int id;
String name;
int age;
//SETTERS AND GETTERS
public int getId() {
return id;
}
#XmlAttribute
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
#XmlElement
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
#XmlElement
public void setAge(int age) {
this.age = age;
}
#Override
public String toString() {
return "JaxBExample [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name = "Customers")
#XmlAccessorType (XmlAccessType.NONE)
public class TestList implements Serializable {
private List<JaxBExample> Customers=null;
public List<JaxBExample> getCustomers() {
return Customers;
}
#XmlElement
public void setCustomers(List<JaxBExample> customers) {
Customers = customers;
}
#Override
public String toString() {
return "TestList [Customers=" + Customers + "]";
}
}
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
public class ConvertObj2XML {
public static void main(String args[]){
JaxBExample customer=new JaxBExample();
customer.setId(1);
customer.setName("Raghava");
customer.setAge(26);
System.out.println("OBJ "+customer);
JaxBExample customer1=new JaxBExample();
customer1.setId(2);
customer1.setName("mani");
customer1.setAge(26);
System.out.println("OBJ "+customer1);
List<JaxBExample> customerLst=new ArrayList<JaxBExample>();
customerLst.add(customer);
customerLst.add(customer1);
TestList customers=new TestList();
customers.setCustomers(customerLst);
System.out.println(customers.toString());
try {
File file = new File("E:\\file.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(TestList.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(customers, file);
jaxbMarshaller.marshal(customers, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
OBJ JaxBExample [id=1, name=Raghava, age=26]
OBJ JaxBExample [id=2, name=mani, age=26]
TestList [Customers=[JaxBExample [id=1, name=Raghava, age=26], JaxBExample [id=2, name=mani, age=26]]]
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Customers>
<customers id="1">
<age>26</age>
<name>Raghava</name>
</customers>
<customers id="2">
<age>26</age>
<name>mani</name>
</customers>
</Customers>

Unmarshall errorExpected elements are <{}>

I am getting a strange error during unmarshalling.
This is my unmarshal code
File file = new File("resources/test.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(FuzzyControllerType.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
FuzzyControllerType fct=(FuzzyControllerType) jaxbUnmarshaller.unmarshal(file);
This is the error I get:
javax.xml.bind.UnmarshalException: unexpected element
(uri:"", local:"FuzzyController"). Expected elements are <{}fuzzyControllerType>
This is my xml
<?xml version="1.0" encoding="UTF-8"?>
<FuzzyController>
<KnowledgeBase>
<FuzzyVariable name="food" domainleft="0.0" domainright="10.0" scale="" type="input">
<FuzzyTerm name="delicious" complement="false">
<LeftLinearShape Param1="5.5" Param2="10.0"/>
</FuzzyTerm>
<FuzzyTerm name="rancid" complement="false">
<TriangularShape Param1="0.0" Param2="2.0" Param3="5.5"/>
</FuzzyTerm>
</FuzzyVariable>
</KnowledgeBase>
</FuzzyController>
My Fuzzy controller type class looks like this:
package testfuzzy;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "FuzzyControllerType", propOrder = {
"knowledgeBase"
})
#XmlRootElement(name="FuzzyControllerType")
public class FuzzyControllerType {
#XmlElement(name = "KnowledgeBase", required = true)
protected KnowledgeBaseType knowledgeBase;
public KnowledgeBaseType getKnowledgeBase() {
return knowledgeBase;
}
public void setKnowledgeBase(KnowledgeBaseType value) {
this.knowledgeBase = value;
}
}
I haven't used any name spaces. How do I fix this?

It looks like your XML document has the root element "FuzzyController"
Add the annotation #XmlRootElement(name="FuzzyController") to the class.
Hope it will help you.
UPDATE:
Change your code like this
package testfuzzy;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "FuzzyController", propOrder = {
"knowledgeBase"
})
#XmlRootElement(name="FuzzyController")
public class FuzzyController {
#XmlElement(name = "KnowledgeBase", required = true)
protected KnowledgeBaseType knowledgeBase;
public KnowledgeBaseType getKnowledgeBase() {
return knowledgeBase;
}
public void setKnowledgeBase(KnowledgeBaseType value) {
this.knowledgeBase = value;
}
}

How to annotate a list using #XmlElement?

I have the following annotation using javax.xml.bind.annotation.XmlElement:
#XmlElement
public List<String> getKeywords() {
return keywords;
}
Which produces the following XML when I marshall some example content:
<keywords>keyword1</keywords>
<keywords>keyword2</keywords>
I would like to get the following XML:
<keywords>
<keyword>keyword1</keyword>
<keyword>keyword2</keyword>
</keywords>
What kind of an annotation should I use?
I've tried
#XmlElementWrapper
#XmlElement(name="keyword")
But then the whole content disappears and the result is:
<keywords/>
The same happens also if I only try to rename the element:
#XmlElement(name="keyword")
What am I doing wrong?
UPDATE:
Here is the updated full code for the class according to the first answers, but it is still not working (the result is an empty list <keywords/> when marshalled to XML):
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
public class Content {
private List<String> keywords;
public Content() {}
#XmlElementWrapper(name="keywords")
#XmlElement(name="keyword")
public List<String> getKeywords() {
return keywords;
}
public void setKeywords(List<String> keywords) {
this.keywords = keywords;
}
}
I also tried the following with the same result:
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Content {
#XmlElementWrapper(name="keywords")
#XmlElement(name="keyword")
private List<String> keywords;
public Content() {}
public List<String> getKeywords() {
return keywords;
}
public void setKeywords(List<String> keywords) {
this.keywords = keywords;
}
}
However, the keywords are not empty as the following produces <keywords>keyword1</keywords><keywords>keyword2</keywords> instead of an empty list:
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
public class Content {
private List<String> keywords;
public Content() {}
#XmlElement
public List<String> getKeywords() {
return keywords;
}
public void setKeywords(List<String> keywords) {
this.keywords = keywords;
}
}
The code for marshalling is (JAX-RS):
import java.io.StringWriter;
import javax.ws.rs.Consumes;
import javax.ws.rs.Path;
import javax.ws.rs.POST;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
#Path("process")
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_XML)
public class ContentHandler {
#POST
public Response process(Content content) {
StringWriter stringWriter = new StringWriter();
try {
JAXBContext jaxbContext = JAXBContext.newInstance(Content.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(content, stringWriter);
} catch (JAXBException e) {
return Response.serverError().entity(e.getMessage()).build();
}
return Response.ok(stringWriter.toString(), MediaType.APPLICATION_XML).build();
}
}

You need to leverage #XmlElementWrapper and #XmlElement.
Java Model
Content
import java.util.List;
import javax.xml.bind.annotation.*;
#XmlRootElement
public class Content {
private List<String> keywords;
public Content() {}
#XmlElementWrapper
#XmlElement(name="keyword")
public List<String> getKeywords() {
return keywords;
}
public void setKeywords(List<String> keywords) {
this.keywords = keywords;
}
}
Demo Code
Demo
import java.util.*;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Content.class);
List<String> strings = new ArrayList<String>(2);
strings.add("foo");
strings.add("bar");
Content content = new Content();
content.setKeywords(strings);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(content, System.out);
}
}
Output
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<content>
<keywords>
<keyword>foo</keyword>
<keyword>bar</keyword>
</keywords>
</content>
For More Information
Below are links to a couple articles from my blog that provide additional information:
http://blog.bdoughan.com/2010/09/jaxb-collection-properties.html
http://blog.bdoughan.com/2012/12/jaxb-representing-null-and-empty.html

Use this form:
#XmlElementWrapper(name="keywords")
#XmlElement(name="keyword")
Please note that if keywords is empty then you will get <keywords />.
Sometimes you will need to add #XmlRootElement to your class (depends on the context) and the #XmlAccessorType(XmlAccessType.?) annotation. I usually use #XmlAccessorType(XmlAccessType.FIELD) and annotate my fields with #XmlElement.

Above answer by - Blaise Doughan is completely correct
Another simple way is , even if you don't write the - #XmlElementWrapper
private List<String> keywords;
#XmlElementWrapper
#XmlElement(name="keyword")
public List<String> getKeywords() {
return keywords;
}
You can use it this way - write the XmlAccessorType on Class level , then XML element name will be same as the class member name - keywords
import java.util.List;
import javax.xml.bind.annotation.*;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Content {
private List<String> keywords;
public Content() {}
public List<String> getKeywords() {
return keywords;
}
public void setKeywords(List<String> keywords) {
this.keywords = keywords;
}
}

Using generic #XmlJavaTypeAdapter to unmarshal wrapped in Guava's Optional

I'm trying to unmarshal some xml into java objects wrapped in Guava's Optional using a generic XmlJavaTypeAdapter. However, I can't get it to work properly using generics.
I'm using eclipselink 2.5.1 / moxy
XML:
<?xml version="1.0" encoding="UTF-8"?>
<page>
<label>Test</label>
<description>Test</description>
</page>
Page.java:
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import org.eclipse.persistence.oxm.annotations.XmlPath;
import com.google.common.base.Optional;
#XmlAccessorType(XmlAccessType.FIELD)
#XmlRootElement()
public class Page {
#XmlPath("label")
private Label label;
#XmlJavaTypeAdapter(OptionalLabelAdapter.class)
private Optional<Label> description = Optional.absent();
}
Label.java:
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlValue;
#XmlAccessorType(XmlAccessType.FIELD)
public class Label {
#XmlValue
private String text;
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
MoxyTest.java:
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class MoxyTest {
public static void main(String[] args) throws JAXBException {
String name = "test";
JAXBContext jc = JAXBContext.newInstance(Page.class);
System.out.println(jc.getClass());
Unmarshaller unmarshaller = jc.createUnmarshaller();
Page page = (Page) unmarshaller.unmarshal(new File("xml/" + name + ".xml"));
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(page, System.out);
}
}
This is my adapter using generics:
import javax.xml.bind.annotation.adapters.XmlAdapter;
import com.google.common.base.Optional;
public class OptionalAdapter<T> extends XmlAdapter<T, Optional<T>> {
#Override
public Optional<T> unmarshal(T value) throws Exception {
return Optional.of(value);
}
#Override
public T marshal(final Optional<T> value) throws Exception {
if(value.isPresent()){
return value.get();
} else {
return null;
}
}
}
This doesn't work, I get a ElementNSImpl wrapped in an Optional. It does work if I use:
#XmlJavaTypeAdapter(OptionalAdapter.class)
#XmlElement(name = "description", type = Label.class)
private Optional<Label> description;
in Page.java. However, I'm not sure how to achieve the same with attributes.
Using this adapter does work:
import javax.xml.bind.annotation.adapters.XmlAdapter;
import com.google.common.base.Optional;
public class OptionalLabelAdapter extends XmlAdapter<Label, Optional<Label>> {
#Override
public Optional<Label> unmarshal(final Label value) throws Exception {
return Optional.of(value);
}
#Override
public Label marshal(final Optional<Label> value) throws Exception {
if(value.isPresent()){
return value.get();
} else {
return null;
}
}
}
Please explain why my generic adapter doesn't work without "#XmlElement(name = "description", type = Label.class)" and please explain how I achieve the same for attributes instead of elements.

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Error in JAXB unMarshaller? - java

Annotate your Tana class with XmlRootElement.

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I need to marshal to XML I am getting duplicate values in my XML file

Unmarshall errorExpected elements are <{}>

How to annotate a list using #XmlElement?

Using generic #XmlJavaTypeAdapter to unmarshal wrapped in Guava's Optional

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