org.springframework.web.portlet.handler

Class SimpleMappingExceptionResolver

java.lang.Object

org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver

org.springframework.web.portlet.handler.SimpleMappingExceptionResolver

All Implemented Interfaces:

Ordered, HandlerExceptionResolver

public class SimpleMappingExceptionResolver
extends AbstractHandlerExceptionResolver

HandlerExceptionResolver implementation that allows for mapping exception class names to view names, either for a set of given handlers or for all handlers in the DispatcherPortlet.

Error views are analogous to error page JSPs, but can be used with any kind of exception including any checked one, with fine-granular mappings for specific handlers.

Since:

2.0

Author:

Juergen Hoeller, John A. Lewis, Arjen Poutsma

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_EXCEPTION_ATTRIBUTE The default name of the exception attribute: "exception".

Fields inherited from class org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver

logger

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
SimpleMappingExceptionResolver()

Method Summary

Modifier and Type	Method and Description
protected String	determineViewName(Exception ex, PortletRequest request) Determine the view name for the given exception, searching the "exceptionMappings", using the "defaultErrorView" as fallback.
protected ModelAndView	doResolveException(PortletRequest request, MimeResponse response, Object handler, Exception ex) Actually resolve the given exception that got thrown during on handler execution, returning a ModelAndView that represents a specific error page if appropriate.
protected String	findMatchingViewName(Properties exceptionMappings, Exception ex) Find a matching view name in the given exception mappings
protected int	getDepth(String exceptionMapping, Exception ex) Return the depth to the superclass matching.
protected ModelAndView	getModelAndView(String viewName, Exception ex) Return a ModelAndView for the given view name and exception.
protected ModelAndView	getModelAndView(String viewName, Exception ex, PortletRequest request) Return a ModelAndView for the given request, view name and exception.
void	setDefaultErrorView(String defaultErrorView) Set the name of the default error view.
void	setExceptionAttribute(String exceptionAttribute) Set the name of the model attribute as which the exception should be exposed.
void	setExceptionMappings(Properties mappings) Set the mappings between exception class names and error view names.

Methods inherited from class org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver

buildLogMessage, getOrder, logException, resolveException, resolveException, setMappedHandlerClasses, setMappedHandlers, setOrder, setRenderWhenMinimized, setWarnLogCategory, shouldApplyTo

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_EXCEPTION_ATTRIBUTE

public static final String DEFAULT_EXCEPTION_ATTRIBUTE

The default name of the exception attribute: "exception".

See Also:

Constant Field Values

Constructor Detail

SimpleMappingExceptionResolver

public SimpleMappingExceptionResolver()

Method Detail

setExceptionMappings

public void setExceptionMappings(Properties mappings)

Set the mappings between exception class names and error view names. The exception class name can be a substring, with no wildcard support at present. A value of "PortletException" would match javax.portet.PortletException and subclasses, for example.

NB: Consider carefully how specific the pattern is, and whether to include package information (which isn't mandatory). For example, "Exception" will match nearly anything, and will probably hide other rules. "java.lang.Exception" would be correct if "Exception" was meant to define a rule for all checked exceptions. With more unusual exception names such as "BaseBusinessException" there's no need to use a FQN.

Follows the same matching algorithm as RuleBasedTransactionAttribute and RollbackRuleAttribute.

Parameters:

mappings - exception patterns (can also be fully qualified class names) as keys, and error view names as values

See Also:

RuleBasedTransactionAttribute, RollbackRuleAttribute

setDefaultErrorView

public void setDefaultErrorView(String defaultErrorView)

Set the name of the default error view. This view will be returned if no specific mapping was found.

Default is none.

setExceptionAttribute

public void setExceptionAttribute(String exceptionAttribute)

Set the name of the model attribute as which the exception should be exposed. Default is "exception".

See Also:

DEFAULT_EXCEPTION_ATTRIBUTE

doResolveException

protected ModelAndView doResolveException(PortletRequest request,
                                          MimeResponse response,
                                          Object handler,
                                          Exception ex)

Actually resolve the given exception that got thrown during on handler execution, returning a ModelAndView that represents a specific error page if appropriate.

Specified by:

doResolveException in class AbstractHandlerExceptionResolver

Parameters:

request - current portlet request

response - current portlet response

handler - the executed handler, or null if none chosen at the time of the exception (for example, if multipart resolution failed)

ex - the exception that got thrown during handler execution

Returns:

a corresponding ModelAndView to forward to, or null for default processing

determineViewName

protected String determineViewName(Exception ex,
                                   PortletRequest request)

Determine the view name for the given exception, searching the "exceptionMappings", using the "defaultErrorView" as fallback.

Parameters:

ex - the exception that got thrown during handler execution

request - current portlet request (useful for obtaining metadata)

Returns:

the resolved view name, or null if none found

findMatchingViewName

protected String findMatchingViewName(Properties exceptionMappings,
                                      Exception ex)

Find a matching view name in the given exception mappings

Parameters:

exceptionMappings - mappings between exception class names and error view names

ex - the exception that got thrown during handler execution

Returns:

the view name, or null if none found

See Also:

setExceptionMappings(java.util.Properties)

getDepth

protected int getDepth(String exceptionMapping,
                       Exception ex)

Return the depth to the superclass matching.

0 means ex matches exactly. Returns -1 if there's no match. Otherwise, returns depth. Lowest depth wins.

Follows the same algorithm as RollbackRuleAttribute.

getModelAndView

protected ModelAndView getModelAndView(String viewName,
                                       Exception ex,
                                       PortletRequest request)

Return a ModelAndView for the given request, view name and exception. Default implementation delegates to getModelAndView(viewName, ex).

Parameters:

viewName - the name of the error view

ex - the exception that got thrown during handler execution

request - current portlet request (useful for obtaining metadata)

Returns:

the ModelAndView instance

See Also:

getModelAndView(String, Exception)

getModelAndView

protected ModelAndView getModelAndView(String viewName,
                                       Exception ex)

Return a ModelAndView for the given view name and exception. Default implementation adds the specified exception attribute. Can be overridden in subclasses.

Parameters:

viewName - the name of the error view

ex - the exception that got thrown during handler execution

Returns:

the ModelAndView instance

See Also:

setExceptionAttribute(java.lang.String)