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javascriptajaxspring-mvcform-data

JavaScript: Formdata append null value - NumberFormatException

The following client code

FormData formData = FormData(document.getElementById(formElemId));
formData.append('version', null);

when received in Server Side via Spring MVC as below

@RequestParam(value = 'version', required = false) Integer versionNumber

throws the following exception

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

Solution

  • You can resolve this issue by adding defaultValue like below.

    @RequestParam(value = "version", required = false, defaultValue = "0") Integer versionNumber

    see documentation