How to handle spring controllers parameter type exceptions

Question

I have simple spring controller.

@GetMapping("/test") @ResponseBody public String doSomething(@RequestParam int a) { return String.valueOf(a); }

when i pass a=1 in query string it works fine.

but when i pass a=abc it gave me this.

> Failed to convert value of type 'java.lang.String' to required type > 'int'; nested exception is java.lang.NumberFormatException: For input > string: "abc".

is there a way so i can handle this error and response back to user like a must be numeric.

thanks in advance.

It's called JSR-303/JSR-349 Bean Validation : docs.spring.io/spring/docs/current/spring-framework-reference/… — AchillesVan
– AchillesVan, Commented Aug 1, 2017 at 15:08
related: stackoverflow.com/q/33958938/4720018, stackoverflow.com/q/3713132/4720018 — djvg
– djvg, Commented Mar 6 at 16:58

Rana_S · Accepted Answer · 2017-08-01 15:07:33Z

You can use @ControllerAdive to handle such exceptions.

@ControllerAdvice public class RestControllerAdive extends ResponseEntityExceptionHandler { @ExceptionHandler(value=NumberFormatException.class) public ResponseEntity<Object> handleNumberFormatException(NumberFormatException ex) { return new ResponseEntity({your-error-message}, HttpStatus); } }

Are you returning a View or ResponseBody? This will return a response body, not a view.
you don't have extend from ResponseEntityExceptionHandler, and ControllerAdvice works only when the exception is thrown within the action method but converters are called before that.

Mohammad · Accepted Answer · 2017-08-01 15:20:52Z

I got Two ways: 1. Using Spring ExceptionHandler

@ExceptionHandler({Exception.class}) public ModelAndView handleException(Exception exception) { ModelAndView modelAndView = new ModelAndView("Exception"); modelAndView.addObject("exception", exception.getMessage()); return modelAndView; }

Instead of int, use String.

public String doSomething(@RequestParam String a) { // conversion to int; validations & Exception handling logic will come here return String.valueOf(a); }

we follow in this way. we have a utility class, which will have all conversion and validation logic. each time we just have to call respective method. like:

UtilityClass.isValidInt(a); UtilityClass.isValidLong(a);

pakkk · Accepted Answer · 2017-08-01 15:08:47Z

-1

The elegant solution for that is catching the Exception and then, use the "ResponseEntity" like this answer:

https://stackoverflow.com/a/16250729/2520689

answered Aug 1, 2017 at 15:08

pakkk

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1 Comment

laim2003 Over a year ago

How will you catch the exception if the problem is a mismatch between the parameter type and the type supplied by the incoming request?

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