Unmarshal error in JAXB

问题

This is the generated code for "PersonType" class.

package demo;

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.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "PersonType", propOrder = {
"name",
"address"
})
public class PersonType {

@XmlElement(name = "Name", required = true)
protected String name;
@XmlElement(name = "Address", required = true)
protected List<AddressType> address;

public String getName() {
    return name;
}


public void setName(String value) {
    this.name = value;
}


public List<AddressType> getAddress() {
    if (address == null) {
        address = new ArrayList<AddressType>();
    }
    return this.address;
}

}

This is the generated code for "AddressType" class.

    package demo;

 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlSchemaType;
 import javax.xml.bind.annotation.XmlType;

 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "AddressType", propOrder = {
"number",
"street"
 })
public class AddressType {

@XmlElement(name = "Number")
@XmlSchemaType(name = "unsignedInt")
protected long number;
@XmlElement(name = "Street", required = true)
protected String street;


public long getNumber() {
    return number;
}


public void setNumber(long value) {
    this.number = value;
}


public String getStreet() {
    return street;
}

public void setStreet(String value) {
    this.street = value;
}

}

This is the xml file I want to unmarshal

<Person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="C:\JAXB Demo\demo.xsd">
  <Name>Sharon Krisher</Name>
  <Address>
    <Street>Iben Gevirol</Street>
    <Number>57</Number>
  </Address>
<Address>
  <Street>Moshe Sharet</Street>
   <Number>89</Number>
  </Address>
</Person>

Code foe unarchall

JAXBContext context = JAXBContext.newInstance(PersonType.class);
    Unmarshaller unmarshaller =context.createUnmarshaller();
    //unmarshaller.setValidating(true);
    PersonType person =(PersonType) unmarshaller.unmarshal(new File("C:\\Users\\sithi\\workspace\\TestJAXB\\src\\data.xml") );

This code gives an exception:

Exception in thread "main" javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"PersonType"). Expected elements are (none)

回答1:

There are two ways to associate a class with a root element. The first is @XmlRootElement on the class, the second is an @XmlElementDecl annotation on a class annotated with @XmlRegistry (when the model is generated from an XML a Schema this class is called ObjectFactory.

Creating the JAXBContext

When you generate a model from XML Schema you should create the JAXBContext on the package name:

JAXBContext jc = JAXBContext.newInstance("demo");

Or generated ObjectFactory class:

JAXBContext jc = JAXBContext.newInstance(demo.ObjectFactory.class);

This will make sure the ObjectFactory class is processed.

http://blog.bdoughan.com/2012/07/jaxb-and-root-elements.html

No @XmlRootElement or @XmlElementDecl?

If there isn't an @XmlRootElement or @XmlElementDecl associating a class with the root element of your document then you will need to use one of the unmarshal methods that take a class parameter.

PersonType pt = unmarshaller.unmarshal(xml, PersonType.class).getValue();

回答2:

The issue is that your PersonType class doesn't have @XmlRootElement. I think you'd want to do the "Unmarshalling into a known type" example in this page, which doesn't require @XmlRootElement on PersonType .

来源：https://stackoverflow.com/questions/19899882/unmarshal-error-in-jaxb

标签

java

xml

jaxb

unmarshalling