Form values to be NULL instead of empty strings in Spring MVC

Question

I am using Spring MVC. I have a form on my page. When I do not enter any values to the form and submit it, it comes with empty strings "".

Is it possible to set null value instead of empty strings?

Thanks in advance for your help.

informatik01 · Accepted Answer · 2019-05-27 16:49:14Z

33

You have to use the @InitBinder annotation because in Spring MVC it always returns "" for the blank values in a form. You have to add this in your controller.

Example:

@InitBinder    /* Converts empty strings into null when a form is submitted */
public void initBinder(WebDataBinder binder) {  
    binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));  
}

Source

edited May 27, 2019 at 16:49

informatik01

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answered Jul 15, 2013 at 6:07

muthu

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2 Comments

schiavuzzi Over a year ago

Great answer. I might add that you can also specify a single property you wish to register the custom editor for: binder.registerCustomEditor(String.class, "myproperty", new StringTrimmerEditor(true));

Hasib Tarafder Over a year ago

Its fine. But i am facing problem when i send the ajax request to the controller. I know that @InitBinder doesn't work for ajax request. So, how can i resolve this issue.

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