HTML and CSS Reference
In-Depth Information
fc.renderResponse();
} finally {
i.remove();
}
}
// Call the parent exception handler's handle() method
getWrapped().handle();
}
}
The core method of the
CustomExceptionHandler
class is the
handle()
method, which is responsible for handling
the exceptions in the JSF application. It is important to note that the
getUnhandledExceptionQueuedEvents()
method can be used for getting all of the unhandled exceptions in the JSF application. Every item in the returned
Iterable
object represents an
ExceptionQueuedEvent
object. From the
ExceptionQueuedEvent
object, you can get the
ExceptionQueuedEventContext
object, from which you can retrieve the
Throwable
object. Using the
Throwable
object,
you can verify the exceptions you want to handle in the applications. Finally, the
NavigationHandler
is used in order
to navigate to the application error page (
error.xhtml
), and the
ExceptionQueuedEvent
is removed from the
Iterable
object. Listing 2-38 shows the
error.xhtml
page.
Listing 2-38.
The Application Error Page
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="
http://www.w3.org/1999/xhtml
"
xmlns:h="
http://java.sun.com/jsf/html
"
>
<h:head>
<title>Error</title>
<link href="#{request.contextPath}/css/simple.css" rel="stylesheet" type="text/css"/>
</h:head>
<h:body>
<h2 class="errorMessage">
An error occurs. return to <a href="index.xhtml">login</a> page.
</h2>
</h:body>
</html>
Secondly, we need to create the custom exception handler factory class that is responsible for creating the
instances of the
CustomExceptionHandler
class. Listing 2-39 shows the
CustomExceptionHandlerFactory
class.
Listing 2-39.
The CustomExceptionHandlerFactory Class
package com.jsfprohtml5.firstapplication.exceptions;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerFactory;
public class CustomExceptionHandlerFactory extends ExceptionHandlerFactory {
private ExceptionHandlerFactory parent;
