Handling Exception and Http Error codes

[emmanuel]

Hi,
This question is addressed to the forum in general but to Marten Deinum specifically.
I am trying to find a clean way to handle all Exceptions as well as http error codes (such as 400, 404 etc...) and map them to the same custom view. I am using Spring MVC 3.0.5
Any help on this will be very much appreciated.

Emmanuel

[emmanuel]

By the way here is what I have done so far:
[B]web.xml

<web-app id="WebApp_ID" version="2.5"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<display-name>myApp</display-name>
	<error-page>
		<error-code>400</error-code>
		<location>/errorPage400.ftl</location>
	</error-page>
	<error-page>
		<error-code>401</error-code>
		<location>/errorPage401.ftl</location>
	</error-page>
	<error-page>
		<error-code>404</error-code>
		<location>/errorPage404.ftl</location>
	</error-page>
	<error-page>
		<error-code>500</error-code>
		<location>/errorPage500.ftl</location>
	</error-page>
	<error-page>
        <exception-type>java.lang.Throwable</exception-type>
        <location>/errorPage.ftl</location>
    </error-page>
    .
    .
    .

My Controller:

@Controller
public class ErrorCodeController extends BaseController {

	@ExceptionHandler(ApplicationException.class)
	@RequestMapping(value="errorPage400", method=RequestMethod.GET)
	@ResponseStatus(value = HttpStatus.BAD_REQUEST)
	public String handleBadRequest(ApplicationException ex,HttpServletResponse response, ModelMap map) { 
		map.addAttribute("http-error-code", HttpStatus.BAD_REQUEST);
		return processErrorCodes(ex,response,map);
	}
	
	
	@ExceptionHandler(ApplicationException.class)
	@RequestMapping(value="errorPage401", method=RequestMethod.GET)
	@ResponseStatus(value=HttpStatus.UNAUTHORIZED,reason="Unauthorized Request")
	public String handleUnauthorizedRequest(ApplicationException ex,HttpServletResponse response, ModelMap map) { 
		map.addAttribute("http-error-code", HttpStatus.UNAUTHORIZED);
		return processErrorCodes(ex,response,map);
	}
	
	
	@ExceptionHandler(ApplicationException.class)
	@RequestMapping(value="errorPage404", method=RequestMethod.GET)
	@ResponseStatus(HttpStatus.NOT_FOUND)
	public String handleNotFoundRequest(ApplicationException ex,HttpServletResponse response, ModelMap map) { 
		map.addAttribute("http-error-code", HttpStatus.NOT_FOUND);
		return processErrorCodes(ex,response,map);
	}

	
	@ExceptionHandler(ApplicationException.class)
	@RequestMapping(value="errorPage500", method=RequestMethod.GET)
	@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR,reason="Internal Server Error")
	public String handleInternalServerError(ApplicationException ex,HttpServletResponse response, ModelMap map) { 
		map.addAttribute("http-error-code", HttpStatus.INTERNAL_SERVER_ERROR);
		return processErrorCodes(ex,response,map);
	}
	
	@ExceptionHandler(ApplicationException.class)
	public void handleApplicationExceptions(Throwable exception, HttpServletResponse response) {
		
	}
	
	private String processErrorCodes(ApplicationException ex,HttpServletResponse response, ModelMap map){
		map.addAttribute("class", ClassUtils.getShortName(ex.getClass()));
		map.addAttribute("message", ex.getMessage());
		map.addAttribute("errorMessage", ex.getErrorMessage());
		map.addAttribute("errorCode", ex.getErrorCode());
		map.addAttribute("timestamp", ex.getCurrentDate());
		return "errorPage";
	}
}

My base Controller:

@Controller
@RequestMapping("/")
public class BaseController {

	// Remember to add any exception that you suspect can be thrown in this web application.
	@ExceptionHandler({ApplicationException.class,NullPointerException.class})
	public ModelAndView handleException(Throwable exception,HttpServletRequest req) {

		ModelMap model = new ModelMap();
		ApplicationException ex = new ApplicationException();
		String timeStamp = ex.getCurrentDate().toString();
		//String temp = ClassUtils.getShortName(ex.getClass());
		//model.addAttribute("class", ClassUtils.getShortName(ex.getClass()));
		model.addAttribute("timeStamp", timeStamp);
		return new ModelAndView("errorPage", model);
	} 
}

So again I want to know if this is the best way to map any exception and http error code to a custom view.
Thanks,

Emmanuel

[Rossen Stoyanchev]

You can configure a SimpleExceptionResolver (instead of the above controllers + web.xml error pages) setting its exceptionMappings, and defaultStatusCodes properties. See the Javadoc on both.

[emmanuel]

Thanks for the reply and suggestion.

Emmanuel

[antonysiagian]

Hi there,

i've used spring mvc with xml base configuration and register the error page in web.xml . Now i'm trying to learn mvc with no xml configuration (servlet-3) and i can not find the way to register the errorpage. could somebody tell me how to register a page for handling an errorcode like 404(resource not found on sever)