Building and Running the Example

import java.io.FileInputStream;

import java.io.IOException;

import java.math.BigDecimal;

import javax.xml.bind.JAXBContext;

import javax.xml.bind.JAXBException;

import javax.xml.bind.Marshaller;

import javax.xml.bind.UnmarshalException;

import javax.xml.bind.Unmarshaller;

import javax.xml.bind.ValidationEvent;

import javax.xml.bind.util.ValidationEventCollector;

import primer.po.*;

2. A JAXBContext instance is created for handling classes generated in primer.po.

JAXBContext jc = JAXBContext.newInstance(

"primer.po" );

3. An Unmarshaller instance is created.

Unmarshaller u = jc.createUnmarshaller();

4. The default JAXB Unmarshaller ValidationEventHandler is enabled to send to validation

warnings and errors to system.out. The default configuration causes the unmarshal
operation to fail upon encountering the first validation error.

u.setValidating( true );

5. An attempt is made to unmarshal po.xml into a Java content tree. For the purposes of this

example, the po.xml contains a deliberate error.

PurchaseOrder po = (PurchaseOrder)u.unmarshal( new FileInputStream(

"po.xml"));

6. The default validation event handler processes a validation error, generates output to

system.out

, and then an exception is thrown.

} catch( UnmarshalException ue ) {

System.out.println(

"Caught UnmarshalException" );

} catch( JAXBException je ) {

je.printStackTrace();

} catch( IOException ioe ) {

ioe.printStackTrace();

}

Building and Running the Unmarshal Validate Example Using
NetBeans IDE

Follow these instructions to build and run the Unmarshal Validate example on your
Application Server instance using the NetBeans IDE.

1. In NetBeans IDE, select File

Open Project.

2. In the Open Project dialog, navigate to tut-install/javaeetutorial5/examples/jaxb/.

Basic JAXB Examples

Chapter 17 · Binding between XML Schema and Java Classes

513