After digging around DispatcherServlet and HttpServletBean.init() in SpringFramework I see that its possible in Spring 4.
org.springframework.web.servlet.DispatcherServlet
/** Throw a NoHandlerFoundException if no Handler was found to process this request? **/
private boolean throwExceptionIfNoHandlerFound = false;
protected void noHandlerFound(HttpServletRequest request, HttpServletResponse response) throws Exception {
if (pageNotFoundLogger.isWarnEnabled()) {
String requestUri = urlPathHelper.getRequestUri(request);
pageNotFoundLogger.warn("No mapping found for HTTP request with URI [" + requestUri +
"] in DispatcherServlet with name '" + getServletName() + "'");
}
if(throwExceptionIfNoHandlerFound) {
ServletServerHttpRequest req = new ServletServerHttpRequest(request);
throw new NoHandlerFoundException(req.getMethod().name(),
req.getServletRequest().getRequestURI(),req.getHeaders());
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
}
throwExceptionIfNoHandlerFound is false by default and we should enable that in web.xml
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>throwExceptionIfNoHandlerFound</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>
And then you can catch it in a class annotated with @ControllerAdvice using this method.
@ExceptionHandler(NoHandlerFoundException.class)
@ResponseStatus(value=HttpStatus.NOT_FOUND)
@ResponseBody
public ResponseEntity<String> requestHandlingNoHandlerFound(HttpServletRequest req, NoHandlerFoundException ex) {
Locale locale = LocaleContextHolder.getLocale();
String errorMessage = messageSource.getMessage("error.bad.url", null, locale);
String errorURL = req.getRequestURL().toString();
ErrorInfo errorInfo = new ErrorInfo(errorURL, errorMessage);
return new ResponseEntity<String>(errorInfo.toJson(), HttpStatus.BAD_REQUEST);
}
Which allows me to return JSON response for bad URLs for which no mapping exist, instead of redirecting to a JSP page :)
{"message":"URL does not exist","url":"http://localhost:8080/service/patientssd"}