Append Marshalled Object Into XML File Using JAXB

Question

I am in a situation in my project to marshal a pojo object and writing first time the output into an XMLfile and then appending the same marshaled object with different values but same node and child nodes in the same file. Here is the following code -

 **Person person = new Person(personList.get(id));**
    try {
        File file = new File("D:\\file.xml");
        JAXBContext jaxbContext = JAXBContext.newInstance(Person.class);
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

        // output pretty printed
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        jaxbMarshaller.marshal(person, file);
        jaxbMarshaller.marshal(person, System.out);

          } catch (JAXBException e) {
        e.printStackTrace();
      }

   Output:

     file.xml created with bellow structure -

     <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
     <person>
       <country>India</country>
       <id>1</id>
       <name>Aatif Hasan</name>
     </person>

As the 'id' in Person constructor gets change and next time the Person object gets marshaled with different property values the 'file.xml' file is overwritten and i lost the previous output. Simply i want to append the marshaled Person object every time when 'id' get's changed. i.e the object properties are set with different values. Ex..

     <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
     <person>
       <country>India</country>
       <id>1</id>
       <name>Aatif Hasan</name>
     </person>
     <person>
       <country>USA</country>
       <id>2</id>
       <name>ABC</name>
     </person>
     <person>
       <country>UK/country>
       <id>3</id>
       <name>XYZ</name>
     </person>
         .
         .
         .
    and so on..

Please any body hint me how to do this. Any help is appreciated. I tried to search the similar scenario on stackoverflow Q/A list but couldn't find.

Warm Regards.!!

You can try to set jaxb.fragment option and use a file input stream when calling marshall. — YMomb
– YMomb, Commented Oct 3, 2014 at 11:37
However the example of XML is not valid. You need to have a single root node. — YMomb
– YMomb, Commented Oct 3, 2014 at 13:13

Community · Accepted Answer · 2017-05-23 12:08:56Z

2

The XML that you need is not well-formed.

I suggest you to wrap all Person.

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Persons", propOrder = {
    "person"
})
@XmlRootElement(name = "Persons")
public class Persons
    implements Serializable
{

    private final static long serialVersionUID = 12343L;
    @XmlElement(name = "Person", required = true)
    protected List<Person> person;

    // getter and setter

}

output expected

<persons>
    <person>
       <country>India</country>
       <id>1</id>
       <name>Aatif Hasan</name>
    </person>
    <person>
       <country>USA</country>
       <id>2</id>
       <name>ABC</name>
    </person>
    <person>
       <country>UK/country>
       <id>3</id>
       <name>XYZ</name>
    </person>
</persons>

Anything here there is a possible solution to append xml into a file.

edited May 23, 2017 at 12:08

CommunityBot

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answered Oct 3, 2014 at 13:26

Xstian

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2 Comments

Aatif Over a year ago

Hi @Xstian, your suggestion worked. Respect & Thanks.!

Xstian Over a year ago

Is a pleasure to help you :)

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