Javax.xml.bind.JAXBContext.createJAXBIntrospector() Method

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Description

The Javax.xml.bind.JAXBContext.createJAXBIntrospector() method creates a JAXBIntrospector object that can be used to introspect JAXB objects.

Declaration

Following is the declaration for javax.xml.bind.JAXBContext.createJAXBIntrospector() method

public JAXBIntrospector createJAXBIntrospector()

Parameters

NA

Return Value

The method always return a non-null valid JAXBIntrospector object.

Exception

UnsupportedOperationException − Calling this method on JAXB 1.0 implementations will throw an UnsupportedOperationException.

Example

The following example shows the usage of javax.xml.bind.JAXBContext.createJAXBIntrospector() method. To proceed, consider the following Student class which will be used to have objects for marshalling purpose −

package com.tutorialspoint;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
 
@XmlRootElement
public class Student{
 
   String name;
   int age;
   int 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;
   }

   public int getId(){
      return id;
   }

   @XmlAttribute
   public void setId(int id){
      this.id = id;
   }
}

The program below creates JAXB introspector which is used for introspect the JAXB object.

package com.tutorialspoint;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBIntrospector;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;

public class JAXBContextDemo {
   public static void main(String[] args) {
      
      JAXBElement jElement = null;
      try {
         // object value is assigned to "Sania"
         Object value = "Sania";

         // JAXB context object created 
         JAXBContext jc = JAXBContext.newInstance(String.class);

         // JAXBIntrospector object is created
         JAXBIntrospector introspector = jc.createJAXBIntrospector();

         // marshaller created
         Marshaller marshaller = jc.createMarshaller();

         if(null == introspector.getElementName(value)) {
            QName qName = new QName("Name");
            jElement = new JAXBElement(qName, Object.class, value);
            marshaller.marshal(jElement, System.out);
         } else {
            marshaller.marshal(value, System.out);
         }
      }catch(Exception ex) {
         ex.printStackTrace();
      }
   }
}

Before we proceed for compilation, we need to make sure that that we download JAXB2.xxx.jar and put it in our CLASSPATH. Once setup is ready, let us compile and run the above program, this will produce the following result −

<?xml version = "1.0" encoding = "UTF-8" standalone = "yes"?>
   <Name xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:xs = "http://www.w3.org/2001/XMLSchema" xsi:type = "xs:string">Sania</Name>