NumberFormatException On ResourceController cannot cast from String to Integer

Question

I have this controller with a get method that recive 3 paramaters as java.lang.Integer

@GetMapping(path = Constantes.CONSULTAR_NODO_SUCESOR)
    public ConsultarNodoSucesorResponse consultarNodoSucesor(@RequestHeader HttpHeaders headerRequest,
                                                             @RequestParam(required = false) Integer idArbol, 
                                                             @RequestParam(required = false) Integer nivelFormulario, 
                                                             @RequestParam(required = false) Integer idSucesor,
                                                             @RequestParam(required = false) String rutaRelacion, 
                                                             @RequestParam(required = false) String tipoRelacion, 
                                                             HttpServletResponse headerResponse) {
        ConsultarNodoSucesorRequest request = new ConsultarNodoSucesorRequest(idArbol, nivelFormulario, idSucesor,
                rutaRelacion, tipoRelacion);
        return service.consultarNodoSucesor(headerRequest, request, headerResponse);
    }

When cosuming the server is returning code 400 for bad request, full error below

Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: \"4111111111\

I'm sending in the paramter idArbol the value 4111111111 but It wont work, in the other hand when I send in that same paramters values like 1044444444 It works fine.

Why is this a thing? what is the max value of a Integer

Community · Accepted Answer · 2020-06-20 09:12:55Z

Unlike the value 1044444444 the value 4111111111 is too large for the int (and therefore Integer) data type, therefore is understood as String. The value overflows the allowed range for the integer.

See Primitive Data Types:

int: By default, the int data type is a 32-bit signed two's complement integer, which has a minimum value of -231 and a maximum value of 231-1.

You might wonder why Spring behaves like that. This is the Type Conversion feature of several annotations of Spring where String is the default value:

Some annotated controller method arguments that represent String-based request input (such as @RequestParam, @RequestHeader, @PathVariable, @MatrixVariable, and @CookieValue) can require type conversion if the argument is declared as something other than String.

For such cases, type conversion is automatically applied based on the configured converters. By default, simple types (int, long, Date, and others) are supported. You can customize type conversion through a WebDataBinder (see DataBinder) or by registering Formatters with the FormattingConversionService. See Spring Field Formatting.

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