@Target(value=METHOD)
@Retention(value=RUNTIME)
@Documented
public @interface ExceptionHandler
Handler methods which are annotated with this annotation are allowed to have very flexible signatures. They may have parameters of the following types, in arbitrary order:
value()
.
ServletRequest
/ HttpServletRequest
or PortletRequest
/ ActionRequest
/
RenderRequest
. Note that in the Portlet case,
an explicitly declared action/render argument is also used for mapping
specific request types onto a handler method (in case of no other
information given that differentiates between action and render requests).
HttpSession
or PortletSession
.
An argument of this type will enforce the presence of a corresponding session.
As a consequence, such an argument will never be null
.
Note that session access may not be thread-safe, in particular in a
Servlet environment: Consider switching the
"synchronizeOnSession"
flag to "true" if multiple requests are allowed to
access a session concurrently.
WebRequest
or
NativeWebRequest
.
Allows for generic request parameter access as well as request/session
attribute access, without ties to the native Servlet/Portlet API.
Locale
for the current request locale
(determined by the most specific locale resolver available,
i.e. the configured LocaleResolver
in a Servlet environment and the portal locale in a Portlet environment).
InputStream
/ Reader
for access
to the request's content. This will be the raw InputStream/Reader as
exposed by the Servlet/Portlet API.
OutputStream
/ Writer
for generating
the response's content. This will be the raw OutputStream/Writer as
exposed by the Servlet/Portlet API.
Model
as an alternative to returning
a model map from the handler method. Note that the provided model is not
pre-populated with regular model attributes and therefore always empty,
as a convenience for preparing the model for an exception-specific view.
The following return types are supported for handler methods:
ModelAndView
object (Servlet MVC or Portlet MVC).
Model
object, with the view name implicitly
determined through a RequestToViewNameTranslator
.
Map
object for exposing a model,
with the view name implicitly determined through a
RequestToViewNameTranslator
.
View
object.
String
value which is interpreted as view name.
@ResponseBody
annotated methods (Servlet-only)
to set the response content. The return value will be converted to the
response stream using
message converters.
HttpEntity<?>
or
ResponseEntity<?>
object
(Servlet-only) to set response headers and content. The ResponseEntity body
will be converted and written to the response stream using
message converters.
void
if the method handles the response itself (by
writing the response content directly, declaring an argument of type
ServletResponse
/ HttpServletResponse
/ RenderResponse
for that purpose)
or if the view name is supposed to be implicitly determined through a
RequestToViewNameTranslator
(not declaring a response argument in the handler method signature;
only applicable in a Servlet environment).
In Servlet environments, you can combine the ExceptionHandler
annotation
with @ResponseStatus
, to define the response status
for the HTTP response.
Note: In Portlet environments, ExceptionHandler
annotated methods
will only be called during the render and resource phases - just like
HandlerExceptionResolver
beans would.
Exceptions carried over from the action and event phases will be invoked during
the render phase as well, with exception handler methods having to be present
on the controller class that defines the applicable render method.
WebRequest
,
AnnotationMethodHandlerExceptionResolver
,
AnnotationMethodHandlerExceptionResolver
Modifier and Type | Optional Element and Description |
---|---|
java.lang.Class<? extends java.lang.Throwable>[] |
value
Exceptions handled by the annotated method.
|