400 Bad request error in Ajax call to Spring controller

Question

I am trying to send data to Spring controller but i am recieving 400 badrequest error in browser console. here is my code:

javascript:

function insertDiscussion(title, content,tags) {
    $.ajax({
        async:false,
        url: 'save',
        contentType: 'application/json; charset=utf-8',
        type: 'POST',
        dataType: 'json',
        data: {
            "title": title,
            "content": content,
            "tags":tags
        },
        success: function(data) {
            generateNoty(data, "warning");
        }
    });
}

Controller:

@RequestMapping(value = "/save", method = RequestMethod.POST)
public String saveDiscussion(
        @RequestParam String title,
        @RequestParam String content, @RequestParam(value="tags") String[] tags) {
    return "hello";
}

Example is working if we dont send array. When i am trying to send array its giving 400 Bad Request error.

If I access same controller with links its working fine but its not working with jquery ajax. did i missed anything?

Answer 1

You're expecting @RequestParam ( POST / GET parameter) but sending JSON as request body. You need to use @RequestBody instead.

Try

public String saveDiscussion(@RequestBody Map json) {
    return "hello";
}

See also:

• http://docs.spring.io/spring/docs/3.1.x/javadoc-api/org/springframework/web/bind/annotation/RequestBody.html
• http://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/mvc.html#mvc-ann-requestmapping-consumes