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I have Spring MVC application with this controller method. @RequestMapping(value = "/add", method = RequestMethod.POST) public String addNumber(@RequestParam(value="number", required=false) Long number) { ... return "redirect:/showAll/"; } In my JSP I have a standard HTML form which is posting a value named "number" to the controller method above. However, if I leave out the value (do not enter anything into the text field) and POST the data to the controller, before the controller method is called my browser shows HTTP Status 400 - Required Long parameter 'number' is not present although the controller method annotation clearly defines the "number"-parameter as not required. Does anyone have a slight idea of what could be going on? Thank you. PS: The exception that is being thrown is as follows: org.springframework.web.bind.MissingServletRequestParameterException: Required Long parameter 'number' is not present EDIT: This is a Spring 3.2.3.RELEASE bug ( see here ). With version 3.1.4.RELEASE I do not have this problem anymore.

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