org.springframework.web.portlet.mvc.annotation
Class AnnotationMethodHandlerExceptionResolver

java.lang.Object
  org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver
      org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver

All Implemented Interfaces:

Ordered, HandlerExceptionResolver

public class AnnotationMethodHandlerExceptionResolver
extends AbstractHandlerExceptionResolver

Implementation of the HandlerExceptionResolver interface that handles exceptions through the ExceptionHandler annotation.

This exception resolver is enabled by default in the DispatcherPortlet.

Since:

3.0

Author:

Arjen Poutsma, Juergen Hoeller

Field Summary

private WebArgumentResolver[]	customArgumentResolvers
private java.util.Map<java.lang.Class<?>,java.util.Map<java.lang.Class<? extends java.lang.Throwable>,java.lang.reflect.Method>>	exceptionHandlerCache
private static java.lang.reflect.Method	NO_METHOD_FOUND

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

AnnotationMethodHandlerExceptionResolver()

Method Summary

private java.lang.Object	doInvokeMethod(java.lang.reflect.Method method, java.lang.Object target, java.lang.Object[] args)
protected ModelAndView	doResolveException(PortletRequest request, MimeResponse response, java.lang.Object handler, java.lang.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.
private java.lang.reflect.Method	findBestExceptionHandlerMethod(java.lang.Object handler, java.lang.Exception thrownException) Finds the handler method that matches the thrown exception best.
private java.lang.reflect.Method	getBestMatchingMethod(java.util.Map<java.lang.Class<? extends java.lang.Throwable>,java.lang.reflect.Method> resolverMethods, java.lang.Exception thrownException) Returns the best matching method.
protected java.util.List<java.lang.Class<? extends java.lang.Throwable>>	getHandledExceptions(java.lang.reflect.Method method) Returns all the exception classes handled by the given method.
private ModelAndView	getModelAndView(java.lang.Object returnValue)
protected java.lang.Object	resolveCommonArgument(MethodParameter methodParameter, NativeWebRequest webRequest, java.lang.Exception thrownException) Resolves common method arguments.
private java.lang.Object[]	resolveHandlerArguments(java.lang.reflect.Method handlerMethod, java.lang.Object handler, NativeWebRequest webRequest, java.lang.Exception thrownException) Resolves the arguments for the given method.
protected java.lang.Object	resolveStandardArgument(java.lang.Class parameterType, NativeWebRequest webRequest, java.lang.Exception thrownException) Resolves standard method arguments.
void	setCustomArgumentResolver(WebArgumentResolver argumentResolver) Set a custom ArgumentResolvers to use for special method parameter types.
void	setCustomArgumentResolvers(WebArgumentResolver[] argumentResolvers) Set one or more custom ArgumentResolvers to use for special method parameter types.

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

NO_METHOD_FOUND

private static final java.lang.reflect.Method NO_METHOD_FOUND

customArgumentResolvers

private WebArgumentResolver[] customArgumentResolvers

exceptionHandlerCache

private final java.util.Map<java.lang.Class<?>,java.util.Map<java.lang.Class<? extends java.lang.Throwable>,java.lang.reflect.Method>> exceptionHandlerCache

Constructor Detail

AnnotationMethodHandlerExceptionResolver

public AnnotationMethodHandlerExceptionResolver()

Method Detail

setCustomArgumentResolver

public void setCustomArgumentResolver(WebArgumentResolver argumentResolver)

Set a custom ArgumentResolvers to use for special method parameter types.

Such a custom ArgumentResolver will kick in first, having a chance to resolve an argument value before the standard argument handling kicks in.

setCustomArgumentResolvers

public void setCustomArgumentResolvers(WebArgumentResolver[] argumentResolvers)

Set one or more custom ArgumentResolvers to use for special method parameter types.

Any such custom ArgumentResolver will kick in first, having a chance to resolve an argument value before the standard argument handling kicks in.

doResolveException

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

Description copied from class: AbstractHandlerExceptionResolver

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

Must be overridden in subclasses, in order to apply specific exception checks. Note that this template method will be invoked after checking whether this resolved applies ("mappedHandlers" etc), so an implementation may simply proceed with its actual exception handling.

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

findBestExceptionHandlerMethod

private java.lang.reflect.Method findBestExceptionHandlerMethod(java.lang.Object handler,
                                                                java.lang.Exception thrownException)

Finds the handler method that matches the thrown exception best.

Parameters:

handler - the handler object

thrownException - the exception to be handled

Returns:

the best matching method; or null if none is found

getHandledExceptions

protected java.util.List<java.lang.Class<? extends java.lang.Throwable>> getHandledExceptions(java.lang.reflect.Method method)

Returns all the exception classes handled by the given method.

Default implementation looks for exceptions in the annotation, or - if that annotation element is empty - any exceptions listed in the method parameters if the method is annotated with @ExceptionHandler.

Parameters:

method - the method

Returns:

the handled exceptions

getBestMatchingMethod

private java.lang.reflect.Method getBestMatchingMethod(java.util.Map<java.lang.Class<? extends java.lang.Throwable>,java.lang.reflect.Method> resolverMethods,
                                                       java.lang.Exception thrownException)

Returns the best matching method. Uses the DepthComparator.

resolveHandlerArguments

private java.lang.Object[] resolveHandlerArguments(java.lang.reflect.Method handlerMethod,
                                                   java.lang.Object handler,
                                                   NativeWebRequest webRequest,
                                                   java.lang.Exception thrownException)
                                            throws java.lang.Exception

Resolves the arguments for the given method. Delegates to resolveCommonArgument(org.springframework.core.MethodParameter, org.springframework.web.context.request.NativeWebRequest, java.lang.Exception).

Throws:

java.lang.Exception

resolveCommonArgument

protected java.lang.Object resolveCommonArgument(MethodParameter methodParameter,
                                                 NativeWebRequest webRequest,
                                                 java.lang.Exception thrownException)
                                          throws java.lang.Exception

Resolves common method arguments. Delegates to registered argumentResolvers first, then checking resolveStandardArgument(java.lang.Class, org.springframework.web.context.request.NativeWebRequest, java.lang.Exception).

Parameters:

methodParameter - the method parameter

webRequest - the request

thrownException - the exception thrown

Returns:

the argument value, or WebArgumentResolver.UNRESOLVED

Throws:

java.lang.Exception

resolveStandardArgument

protected java.lang.Object resolveStandardArgument(java.lang.Class parameterType,
                                                   NativeWebRequest webRequest,
                                                   java.lang.Exception thrownException)
                                            throws java.lang.Exception

Resolves standard method arguments. The default implementation handles NativeWebRequest, ServletRequest, ServletResponse, HttpSession, Principal, Locale, request InputStream, request Reader, response OutputStream, response Writer, and the given thrownException.

Parameters:

parameterType - the method parameter type

webRequest - the request

thrownException - the exception thrown

Returns:

the argument value, or WebArgumentResolver.UNRESOLVED

Throws:

java.lang.Exception

doInvokeMethod

private java.lang.Object doInvokeMethod(java.lang.reflect.Method method,
                                        java.lang.Object target,
                                        java.lang.Object[] args)
                                 throws java.lang.Exception

Throws:

java.lang.Exception

getModelAndView

private ModelAndView getModelAndView(java.lang.Object returnValue)