How to return a Boolean value from a Spring MVC controller to ajax?

Question

I am working with a spring MVC controller which will return a boolean value as response to the ajax request. But when spring mvc is trying to return a boolean value it is giving me the server responded with a status of 406 (Not Acceptable) error Please Help. Thanks in advance

This is my controller

@Controller
public class MainController {
    @RequestMapping(value="/check.html",method=RequestMethod.POST)
    public @ResponseBody Boolean checkValue(){
        return true;
    }
}

This is my Ajax method

<script type="text/javascript">
    function doAjax() {
        $.ajax({
            type : "post",
            url : 'check.html',
            success : function(response) {
                if(response===true)
                {
                    window.alert("true");
                }
                else
                {
                    window.alert("false");
                }
            },
            error : function(e){
                window.alert("error");
            }
        });
    }
</script>

Abdul Malik · Accepted Answer · 2017-04-11 21:50:38Z

1

I was experiencing same problem when I was returning a string to the AJAX request. But I solved it using HttpServletResponse object. You can also do it like this way.

@RequestMapping(value="/check.html",method=RequestMethod.POST)
public @ResponseBody void checkValue(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){

    /*Your Logic*/
    httpServletResponse.getWriter().println(true);
    httpServletResponse.flushBuffer();

}

Now you can get a boolean response and you can use response in your javascript code as a boolean variable.

answered Apr 11, 2017 at 21:50

Abdul Malik

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Community · Accepted Answer · 2017-05-23 10:30:45Z

0

I think some primitive values may not be valid JSON. I would normally return a map looking like {"status": true} in such cases.

edited May 23, 2017 at 10:30

CommunityBot

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answered Nov 1, 2015 at 1:54

Sanjay

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Comments

Master Slave · Accepted Answer · 2015-11-01 07:15:40Z

Try adding the produces attribute to your @RequestMapping so

@RequestMapping(value="/check.html",method=RequestMethod.POST, produces="application/json" )

To understand your problem read about the content negotiation in spring.

The extension of your request check.html is considered when the frameworks reasons about the return type, and it gives a hint that the response should be html. The annotation @ResponseBody tries to add a content to response's body.

When you return a primitive true the framework attempts to find a converter that will convert the true value to HTML. It fails, and you get your error message.

With the produces set to application/json, it will use the underlying converter (jackson if you didn't change the defaults), and it will convert without issues

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