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## How to use Castor's XMLContext for un-/marshalling Intended Audience Prerequisites Domain classes Basic code fragments ## Intended Audience Anyone who wants to use Castor XML for XML data binding, namely marshalling and unmarshalling operations. ## Prerequisites You should have downloaded the Castor binaries or included Castor as a dependency in a Maven project. ## Domain classes For the purpose of showcasing the use of the `XMLContext` class, let's assume we have a simple `Person` class as follows:
    import java.util.Date;

    /** An simple person class */
    public class Person implements java.io.Serializable {

       /** The name of the person */
       private String name = null;

       /** The Date of birth */
       private Date dob = null;

       /** Creates a Person with no name */
       public Person() {
          super();
       }

       /** Creates a Person with the given name */
       public Person(String name) {
          this.name  = name;
       }

       /**
         * @return date of birth of the person
         */
       public Date getDateOfBirth() {
          return dob;
       }

       /**
         * @return name of the person
         */
       public String getName() {
          return name;
       }

       /**
         * Sets the date of birth of the person
         * @param name the name of the person
         */
       public void setDateOfBirth(Date dob) {
          this.dob = dob;
       }

       /**
         * Sets the name of the person
         * @param name the name of the person
         */
       public void setName(String name) {
          this.name = name;
       }
    }
## Basic code fragments Starting with Castor 1.1.2, the XMLContext class provides a bootstrap mechanism for Castor XML, and allows easy (and efficient) instantiation of Marshaller and Unmarshaller instances, which can be used to perform basic XML data binding operations. Below is a code sample that shows how to use the `XMLContext` class for umarshalling a `Person` instance using an Unmarshaller. In this example, a mapping file is used.
    import org.exolab.castor.xml.XMLContext;
    import org.exolab.castor.mapping.Mapping;
    import org.exolab.castor.xml.Unmarshaller;

    //create a Mapping instance
    Mapping mapping = XMLContext.createMapping();
    mapping.loadMapping("mapping.xml");

    // create an XMLContext instance and set mapping
    XMLContext context = new XMLContext();
    context.addMapping(mapping);

    // create a new Unmarshaller
    Unmarshaller unmarshaller = context.createUnmarshaller();
    unmarshaller.setClass(Person.class);

    // Create a Reader to the file to unmarshal from
    Reader reader = new FileReader("test.xml");

    // Unmarshal the person object
    Person person = (Person) unmarshaller.unmarshal(reader);
As shown above, the XMLContext class offers various factory methods to obtain a new Marshaller, Unmarshaller or Mapping instance. When you need more than one Unmarshaller instance in your application, please call createUnmarshaller as required. As all `Unmarshaller` instances are created from the very same `XMLContext` instance, overhead will be minimal. Please note, though, that an `Unmarshaller` instance is not thread-safe.
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