Module jakarta.xml.bind

Package jakarta.xml.bind

Interface ValidationEventHandler

All Known Implementing Classes:

DefaultValidationEventHandler, ValidationEventCollector

public interface ValidationEventHandler

A basic event handler interface for validation errors.

If an application needs to implement customized event handling, it must implement this interface and then register it with either the Unmarshaller, or the Marshaller. The Jakarta XML Binding Provider will then report validation errors and warnings encountered during the unmarshal, marshal, and validate operations to these event handlers.

If the handleEvent method throws an unchecked runtime exception, the Jakarta XML Binding Provider must treat that as if the method returned false, effectively terminating whatever operation was in progress at the time (unmarshal, validate, or marshal).

Modifying the Java content tree within your event handler is undefined by the specification and may result in unexpected behaviour.

Failing to return false from the handleEvent method after encountering a fatal error is undefined by the specification and may result in unexpected behavior.

Default Event Handler

If the client application does not set an event handler on their Unmarshaller, or Marshaller prior to calling the validate, unmarshal, or marshal methods, then a default event handler will receive notification of any errors or warnings encountered. The default event handler will cause the current operation to halt after encountering the first error or fatal error (but will attempt to continue after receiving warnings).

Since:

1.6, JAXB 1.0

See Also:

• Unmarshaller
• Marshaller
• ValidationEvent
• ValidationEventCollector

Method Summary

Modifier and Type	Method	Description
boolean	handleEvent(ValidationEvent event)	Receive notification of a validation warning or error.

Method Details

handleEvent

boolean handleEvent(ValidationEvent event)

Receive notification of a validation warning or error. The ValidationEvent will have a ValidationEventLocator embedded in it that indicates where the error or warning occurred.

If an unchecked runtime exception is thrown from this method, the Jakarta XML Binding provider will treat it as if the method returned false and interrupt the current unmarshal, validate, or marshal operation.

Parameters:

event - the encapsulated validation event information. It is a provider error if this parameter is null.

Returns:

true if the Jakarta XML Binding Provider should attempt to continue the current unmarshal, validate, or marshal operation after handling this warning/error, false if the provider should terminate the current operation with the appropriate UnmarshalException, ValidationException, or MarshalException.

Throws:

IllegalArgumentException - if the event object is null.