org.apache.tapestry5.internal.services

Class DefaultRequestExceptionHandler

java.lang.Object

org.apache.tapestry5.internal.services.DefaultRequestExceptionHandler

All Implemented Interfaces:

RequestExceptionHandler

public class DefaultRequestExceptionHandler
extends Object
implements RequestExceptionHandler

Default implementation of RequestExceptionHandler that displays the standard ExceptionReport page. Similarly to the servlet spec's standard error handling, the default exception handler allows configuring handlers for specific types of exceptions. The error-page/exception-type configuration in web.xml does not work in Tapestry application as errors are wrapped in Tapestry's exception types (see OperationException and ComponentEventException ). Configurations are flexible. You can either contribute a ExceptionHandlerAssistant to use arbitrary complex logic for error handling or a page class to render for the specific exception. Additionally, exceptions can carry context for the error page. Exception context is formed either from the name of Exception (e.g. SmtpNotRespondingException -> ServiceFailure mapping would render a page with URL /servicefailure/smtpnotresponding) or they can implement ContextAwareException interface. If no configured exception type is found, the default exception page SymbolConstants.EXCEPTION_REPORT_PAGE is rendered. This fallback exception page must implement the ExceptionReporter interface.

Constructor Summary

Constructors

Constructor and Description
DefaultRequestExceptionHandler(RequestPageCache pageCache, PageResponseRenderer renderer, org.slf4j.Logger logger, String pageName, Request request, Response response, ComponentClassResolver componentClassResolver, LinkSource linkSource, ServiceResources serviceResources, ExceptionReporter exceptionReporter, Map<Class,Object> configuration)

Method Summary

Modifier and Type	Method and Description
protected Object[]	formExceptionContext(Throwable exception) Form exception context either from the name of the exception, or the context the exception contains if it's of type ContextAwareException
void	handleRequestException(Throwable exception) Handles the exception thrown at some point the request was being processed First checks if there was a specific exception handler/page configured for this exception type, it's super class or super-super class.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultRequestExceptionHandler

public DefaultRequestExceptionHandler(RequestPageCache pageCache,
                                      PageResponseRenderer renderer,
                                      org.slf4j.Logger logger,
                                      @Symbol(value="tapestry.exception-report-page")
                                      String pageName,
                                      Request request,
                                      Response response,
                                      ComponentClassResolver componentClassResolver,
                                      LinkSource linkSource,
                                      ServiceResources serviceResources,
                                      ExceptionReporter exceptionReporter,
                                      Map<Class,Object> configuration)

Parameters:

configuration - A map of Exception class and handler values. A handler is either a page class or an ExceptionHandlerAssistant. ExceptionHandlerAssistant can be a class

Method Detail

handleRequestException

public void handleRequestException(Throwable exception)
                            throws IOException

Handles the exception thrown at some point the request was being processed First checks if there was a specific exception handler/page configured for this exception type, it's super class or super-super class. Renders the default exception page if none was configured.

Specified by:

handleRequestException in interface RequestExceptionHandler

Parameters:

exception - The exception that was thrown

Throws:

IOException

formExceptionContext

protected Object[] formExceptionContext(Throwable exception)

Form exception context either from the name of the exception, or the context the exception contains if it's of type ContextAwareException

Parameters:

exception - The exception that the context is formed for

Returns:

Returns an array of objects to be used as the exception context