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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 UnmarshalValidate Example Using
NetBeans IDE
Basic JAXB Examples
Follow these instructions to build and run the Unmarshal Validate example on your
Application Server instance using NetBeans IDE.
1. In NetBeans IDE, select File→Open Project.
2. In the Open Project dialog, navigate to tut-install/javaeetutorial5/examples/jaxb/.
3. Select the unmarshal-validate folder.
4. Select the Open as Main Project check box.
5. Click Open Project.
6. Right-click the unmarshal-validate project and select Run.
Chapter 17 • Binding between XML Schema and Java Classes 511