How to force Spring Security OAuth 2 to use JSON instead of XML?

[Bruno Braz]

I've created Spring MVC application and set up Spring Security OAuth 2. While calling methods from my brower I get XML:

<oauth>
    <error_description>
        Full authentication is required to access this resource
    </error_description>
    <error>unauthorized</error>
</oauth>

Instead of JSON:

{
  "error": "unauthorized",
  "error_description": "An Authentication object was not found in the SecurityContext"
}

Browser sends following header:

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

When I set json accept header I get JSON. I need to force my authorization server always send JSON. Haven't found any solution. Thanks.

[desole]

@burnaz I kind of get JSON always in my current Spring Security configuration. Can you post the dependencies version please?