Skip to main content

JAXB - Unmarshal XML String into Java Object

1 min

When trying to unmarshal XML to a Java object using JAXB you might want to pass the XML as a String. However, the unmarshal() method of the Unmarshaller interface does not support passing an XML String.

Following code sample illustrates how to solve this.

Wrap the XML String in a StringReader object and pass this to the unmarshal() method as shown below.

Note that an even shorter one-liner notation is also possible.

  public static Car unmarshal(String xml) throws JAXBException {
    JAXBContext jaxbContext = JAXBContext.newInstance(Car.class);
    Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();

    StringReader reader = new StringReader(xml);
    Car car = (Car) jaxbUnmarshaller.unmarshal(reader);;
    return car;

Next, pass below string representation of an XML to the above unmarshal() method.

xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" "
  + "standalone=\"yes\"?>"
  + "<ns2:Car xmlns:ns2=\"com.codenotfound.jaxb.model\" id=\"ABC-123\">"
  + "<make>Passat</make>"
  + "<manufacturer>Volkswagen</manufacturer></ns2:Car>";

JAXB is now able to unmarshal the StringReader object and the result is the following:

Car [make=Passat, manufacturer=Volkswagen, id=ABC-123]
If you would like to run the above code sample you can get the full source code on GitHub.

This concludes our short example on how to unmarshal an XML String. If you found this post helpful or have any questions or remarks, please leave a comment.