Optional parameter in Java

Question

I want to update the user with a name and/or image.

The name is always on the input because I fetched from the database but the fileUpload is optional.

How do I make my controller handle an optional parameter for the fileUpload?

Atm, if I don't upload something I'm getting

HTTP Status 400 - Required request part 'fileUpload' is not present

Spring controller

@RequestMapping(value = "/user/update", method = RequestMethod.POST)
public @ResponseBody String updateUser(HttpSession session,@RequestParam("name") String name, @RequestParam("fileUpload") MultipartFile image) {
    String loggedUser = session.getAttribute("loggedUser").toString();
    return User.updateUser(loggedUser,name,image);
}

Ajax

function updateUserSettings() {
var name = $('#userName').val();
var formData = new FormData();
formData.append("name", name);
formData.append("fileUpload", file);
$.ajax({
    type: 'post',
    url: '/user/update',
    data: formData,
    enctype: 'multipart/form-data',
    processData: false,
    contentType: false
});

}

Possible duplicate of @RequestParam in Spring MVC handling optional parameters — Unknown
– Unknown, Commented Feb 2, 2018 at 9:50

31piy · Accepted Answer · 2018-02-02 09:42:16Z

4

Change this:

... @RequestParam("fileUpload") MultipartFile image

to:

... @RequestParam(value="fileUpload", required=false) MultipartFile image

Refer to the docs for more info on the available switches.

answered Feb 2, 2018 at 9:42

31piy

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