Spring MVC ErrorController doesn't produce response

I have an ErrorController to handle all exceptions and produce a custom JSON response. But when one of my other Controllers throws a RuntimeException, the ErrorController handles the exception but doesn't produce my JSON response.

I'm using Spring MVC and Tomcat 7

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0"
     xmlns="http://ift.tt/nSRXKP" xmlns:xsi="http://ift.tt/ra1lAU"
     xsi:schemaLocation="http://ift.tt/nSRXKP http://ift.tt/1eWqHMP">

     <!-- Other web.xml stuff-->

     <error-page>
         <location>/error</location>
     </error-page>
</web-app>

ErrorController

@Controller
public class ErrorController {

    @RequestMapping("/error")
    @ResponseBody
    public JsonNode handleError(HttpServletRequest request,
            HttpServletResponse response, Exception e) {

        int statusCode = response.getStatus();

        ObjectNode error = new ObjectMapper().createObjectNode();
        if (statusCode == HttpServletResponse.SC_NOT_FOUND) {
            error.put("error", "Not found");
        } else if (statusCode == HttpServletResponse.SC_UNAUTHORIZED) {
            error.put("error", "Error with authentication");
        } else if (statusCode == HttpServletResponse.SC_FORBIDDEN) {
            error.put("error", "Insufficient permissions");
        } else {
            error.put("error", "Some other error occurred");
        }
        return error;
    }
}

OtherController

@Controller
@RequestMapping("/other")
public class OtherController {

    @RequestMapping(method = RequestMethod.GET)
    public BufferedImage doStuff() {

        // Does stuff

        throw new RuntimeException();
    }
}