Json integer being read as java Boolean true

Question

Inside a REST API request json body, I'm passing "argument1":true and it works. But I discovered that when using any number it converts it to true. Only when using explicitly false it turns into false. I'm using Spring Boot ResponseEntityExceptionHandler and @RestControllerAdvice to handle all exceptions. How can I cast any exception when converting 534 to true?

Do you expect argument1 to be of type boolean or int? I mean, you want spring binder to throw exception when argument1 is integer and not boolean? — noiaverbale
– noiaverbale, Commented Feb 12, 2019 at 15:18
@noiaverbale, exactly as you stated. I want to reject any non boolean values (only true or false) — gabriel119435
– gabriel119435, Commented Feb 12, 2019 at 15:21

noiaverbale · Accepted Answer · 2019-02-12 16:09:40Z

5

Add in your controller a method annotated with @InitBinder and provide a custom boolean editor

@InitBinder
public void initBinder(WebDataBinder webDataBinder) {
    webDataBinder.registerCustomEditor(Boolean.class, new CustomBooleanEditor("true", "false", false));
}

Spring registers a default CustomBooleanEditor mapping "true", "on", "yes" and any non zero number as true (also allowing empty value as false) throwing IllegalArgumentException when value is not valid.

You can either override it or provide your own implementation throwing a specific exception.

edited Feb 12, 2019 at 16:09

answered Feb 12, 2019 at 15:32

noiaverbale

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3 Comments

gabriel119435 Over a year ago

Thanks for your info. Could you please link any documentation towards this information? Thanks in advance

noiaverbale Over a year ago

It's not a much, but InitBinder. Can't find a list of default converters/editor right now.

poyger Over a year ago

I don't get this working when having a @RequestBody.....so it is no forms just a rest endpoint.....should it work in that scenario also ?

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