Removing Whitelabel Page in Spring 2.0

SimpleErrorController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.servlet.error.AbstractErrorController;
import org.springframework.boot.autoconfigure.web.servlet.error.ErrorViewResolver;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
import java.util.Map;

@RestController
public class SimpleErrorController extends AbstractErrorController {

    private static final String PATH = "/error";

    @Autowired
    public SimpleErrorController(ErrorAttributes errorAttributes) {
        super(errorAttributes);
    }

    public SimpleErrorController(ErrorAttributes errorAttributes, List<ErrorViewResolver> errorViewResolvers) {
        super(errorAttributes, errorViewResolvers);
    }

    @RequestMapping(value = PATH)
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest aRequest, HttpServletResponse response) {
        Map<String, Object> body = getErrorAttributes(aRequest, getTraceParameter(aRequest));
        String trace = (String) body.get("trace");
        if (trace != null) {
            String[] lines = trace.split("\n\t");
            body.put("trace", lines);
        }
        return new ResponseEntity<>(body, HttpStatus.valueOf(response.getStatus()));
    }

    protected boolean getTraceParameter(HttpServletRequest request) {
        String parameter = request.getParameter("trace");
        return parameter != null && !"false".equals(parameter.toLowerCase());
    }

    @Override
    public String getErrorPath() {
        return PATH;
    }
}

Based on this gist with a few modifications.