Get a modelandview object in another controller
I am working to transfer data from one controller to another. I have one class that is annotated with @ControllerAdvice that is used to handle all application exceptions.
I handle the exception and add them to the custom class and then to the ModelAndView. I add this and pass it to another controller using redirection. And in this controller I want this added object, but I don't have a big idea on how to get this object. I tried some trick but no success.
code:
ExceptionHandler class:
@ControllerAdvice
public class DefaultExceptionHandler {
@Autowired
private CPro cPro;
private static final Logger LOG = LoggerFactory.getLogger(DefaultExceptionHandler.class);
@RequestMapping(produces = {MediaType.APPLICATION_JSON_VALUE})
@ExceptionHandler(Exception.class)
@ResponseStatus(value = INTERNAL_SERVER_ERROR)
@ResponseBody
public ModelAndView handleException(Exception ex) {
ModelAndView modelAndView = new ModelAndView("redirect:/");
String exceptionType = ex.getClass().getSimpleName();
DefaultExceptionHandler.LOG.error("Internal Server Exception", ex);
ErrorResponse response = new ErrorResponse();
if (ex.getCause() != null) {
response.addSimpleError(exceptionType, ex.getCause().getMessage(), cPro.getProName());
} else {
response.addSimpleError(exceptionType, ex.getMessage(), cPro.getProName());
}
modelAndView.addObject("processingException", response);
return modelAndView;
}
}
my home controller:
@RequestMapping(value = "/", method = RequestMethod.GET)
public String getHomePage(@ModelAttribute("processingException") ErrorResponse errorResponse, Model model) {
// I want to get object data of processingException added in exception handler using ModelAndView
model.addAttribute("processingException", errorResponse.getError() == null ? null : errorResponse);
return "upscale"; //here upscale.html redirection
}
Does anyone have an idea how to get the object data in my controller?
Thank.
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After a lot of searching and searching various forums and articles, I found some solution. I pooled data and code from various forums where I fulfilled my requirement.
We can use FlashMap . Just get the request context and add FlashMap and add other data to FlashMap.
code:
@ControllerAdvice
public class DefaultExceptionHandler {
@Autowired
private CPro cPro;
private static final Logger LOG = LoggerFactory.getLogger(DefaultExceptionHandler.class);
@ExceptionHandler(Exception.class)
public String handleException(Exception ex, HttpServletRequest request) throws IOException {
DefaultExceptionHandler.LOG.error("Internal Server Exception", ex);
String exceptionType = ex.getClass().getSimpleName();
ErrorResponse response = new ErrorResponse();
if (ex.getCause() != null) {
response.addError(exceptionType, ex.getCause().getMessage(), cPro.getProName());
} else {
response.addError(exceptionType, ex.getMessage(), cPro.getProName());
}
FlashMap outputFlashMap = RequestContextUtils.getOutputFlashMap(request);
if (outputFlashMap != null) {
outputFlashMap.put("processingException", response);
}
return "redirect:/";
}
}
and on the other hand, in the controller, use ModelAttribute to get the data that is sent from the exception handler method.
code:
@RequestMapping(value = "/", method = RequestMethod.GET)
public String getHomePage(Model model, @ModelAttribute("processingException") Object processingException) {
if (processingException instanceof ErrorResponse) {
model.addAttribute("processingException", ((ErrorResponse) processingException).getError());
} else {
model.addAttribute("processingException", null);
}
return "upscale"; //here upscale.html redirection
}
After all the bingo .. Did my job.
If anyone has an even better idea, then welcome anyway.
Thanks guys.
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You can do a workaround like this:
public ModelAndView handleException(Exception ex, HttpServletRequest req) {
//...
ModelAndView modelAndView = new ModelAndView("forward:/");
//...
req.setAttribute("processingException", response);
Then, in your controller method, you will access the HttpServletRequest and get the attribute (object):
public String getHomePage(@ModelAttribute("processingException", HttpServletRequest req)
{
//....
req.getAttribute("processingException");
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