Advanced Features of ADF - Oracle ADF 11gR2 Development Beginner's Guide - page 270

Exception handling
Excepion handling in Java is a very common pracice for handling the excepions and errors
occurring in the applicaion. Some of the excepion-handling processes are as follows:
Try-catch : A Java developer uses the try - catch statement to gracefully handle
an applicaion's excepion. We can use the finally statement to include closing
operaions ater the occurrence of the excepion.
Task low excepion handler : We can have an excepion handler for the task low
that will navigate to the error page, or display an error message or process the error
low for the page. You can mark an acivity in the task low as error-handler.
Databindings (DCErrorHandler) : In the Databindings.cpx file, you can add an
error handling class for handling errors in the ADF controller layer. You will have to
use the ErrorHandlerClass property to specify the ErrorHandlerImpl class
that extends the DCErrorHandlerImpl class. In this way, you can handle the
excepion at the controller layer. The following code snippet explains this:
import oracle.adf.model
.binding.DCBindingContainer;
import oracle.adf.model
.binding.DCErrorHandlerImpl;
class ErrorHandlerImpl
extends DCErrorHandlerImpl {
public ErrorHandlerImpl()
{ super(true); }
@Override
public void reportException
(DCBindingContainer dCBindingContainer,
Exception exception) {
super.reportException
(dCBindingContainer, exception);
}
}
You can also create a text file of the name oracle.adf.view.rich.context.
ExceptionHandler in the .adf/META-INF/services folder. In this file, provide
the fully qualiied class that will deine your excepion handler. The handler class
should extend the ExceptionHandler class as shown in the following code snippet:
import oracle.adf.view
.rich.context.ExceptionHandler;
public class CustomExceptionHandler
extends ExceptionHandler {